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The influenza A and B versions that can infect humans have different proteins and they behave a little differently. If you get sick with flu, influenza antiviral drugs may be a treatment option. Colds generally do not result in serious health problems. However, many people who are sick with influenza virus. The flu vaccine helps prevent both. a B/Austria/1359417/2021 (B/Victoria lineage)-like virus. B in terms of prevalence, how contagious they are, what the vaccine covers, and severity and recovery. Smith, Andrewes, and Laidlaw isolate influenza A virus in ferrets in 1933. Choose water, juice and warm soups to prevent dehydration Get more sleep to help your immune system fight infection. All flu vaccines for the 2024-2025 season are anticipated to be trivalent in the United States. The symptoms of flu caused by H1N1, commonly called the swine flu, are similar to those of other flu viruses. The flu vaccine helps prevent both. Types A, B, and C affect humans, while influenza D mainly affects cattle. Idaho dairy producers are navigating one of the worst outbreaks of an avian flu strain in the U, and from an animal health and public health standpoint, the situation is largely self-monitored. An annual seasonal flu vaccine is the best way to help reduce the risk of getting flu and any of its potentially serious complications. FluMos-v2 is designed to induce antibodies against many different. The H1N1 virus (swine flu) is an infection of the nose, throat, and lungs. Influenza A and B viruses isolated in the 1930s; Inactivated vaccines first developed and used in the late 1930s and 1940s; Printer friendly version [14 pages] Influenza is an infectious viral illness. Influenza A viruses are established in many animal species. All flu vaccines for the 2024-2025 season are anticipated to be trivalent in the United States. Antiviral medicines taken within the first 2 days of illness can reduce the length and. Influenza types A and B cause epidemics of respiratory illness that occur yearly during the winter. Dec 30, 2023 · Flu A and flu B are both types of the influenza virus, but there are differences. The flu is caused by a virus. 4th revision: July 2017. Throughout the respiratory season, we analyze wastewater for the presence of respiratory syncytial virus (RSV) and influenza virus (types A and B). Mar 30, 2023 · This graphic shows the two types of influenza viruses (A and B) that cause most human illness and that are responsible for flu seasons each year. Influenza A was a more severe disease than influenza B during the period 2017/2018. People who are sick with flu often feel some or all of these symptoms: Fever*/feeling feverish or chills Sore throat. Influenza B virus is the only species in the genus Betainfluenzavirus in the virus family Orthomyxoviridae Influenza B virus is only known to infect certain mammal species, including humans, ferrets, pigs, and seals. Season The flu reporting year uses standard reporting weeks outlined by the Centers for Disease Control and Prevention (CDC), where every year has 52 or 53 reporting weeks. The degree of illness can range from mild to severe and can include fever, body aches, cough, headache, and sore throat. Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world. Unlike influenza A or B, which have two glycoproteins (HA and NA), influenza C has only one glycoprotein (HEF) Mainly infects humans. Influenza B almost exclusively infects humans and is less common than influenza A. Immunofluorescence, Direct (DFA) or Indirect (IFA) Florescent Antibody Staining [antigen detection] A and B. The concurrent circulation of SARS-CoV-2 with other respiratory viruses is unstoppable and represents a new diagnostic reality for clinicians and clinical microbiology laboratories. Muscle or body aches Fatigue (very tired) Some people may have vomiting and diarrhea, though this is more common in children than adults. It is characterized by a sudden onset of fever, cough (usually dry), headache, muscle and joint pain, severe malaise (feeling unwell), sore throat and a runny nose. Mainly infects pigs and cattle. Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices — United States, 2023-2024 Influenza Season has been published. Uncomplicated influenza. FluNet is a global web-based tool for influenza virological surveillance first launched in 1997. Most people who have the flu are infected with the influenza type A virus. H1N1 influenza, a subtype of influenza A virus, is an infectious viral illness that causes both upper and, in some cases, lower respiratory tract infections in its host. It is characterized by a sudden onset of fever, cough (usually dry), headache, muscle and joint pain, severe malaise (feeling unwell), sore throat and a runny nose. CDC collects, compiles, and analyzes information on. This means the flu vaccine reduced a person's overall risk of. It causes a fever, runny nose, sore throat, cough, headache, muscle aches (myalgias), and a general feeling of illness (malaise). These are Fluzone High-Dose Quadrivalent vaccine Flublok Quadrivalent recombinant Influenza vaccine a nd Fluad Quadrivalent adjuvanted influenza vaccine. The cough can be severe and can last two or more weeks. The specificity for SARS-CoV-2, RSV and Influenza A and B was >95% The Fluorecare® combo antigenic presents satisfying performance in real-life clinical setting for Influenza A and B in samples with high viral load. The illness classically presents with sudden onset of fever, chills, headache, myalgia and a non-productive cough. People die of the flu sometimes. 9/01/2022: Influenza Vaccines Available During the 2022-23 Season. Influenza virus is transmitted primarily by droplets or respiratory secretions of infected persons. The composition of flu vaccines. B in terms of prevalence, how contagious they are, what the vaccine covers, and severity and recovery. These subtypes are grouped based on two proteins on the surface of the viruses. This is more common in children. It can reduce flu illnesses, visits to doctor’s offices, and missed work and school due to flu, as well as make symptoms less severe and reduce flu-related hospitalizations and deaths in people who get vaccinated but still get sick. People in NSW can die from flu-related illness. The common cold and flu are both contagious viral infections of the respiratory tract. B in terms of prevalence, how contagious they are, what the vaccine covers, and severity and recovery. However, if symptoms persist for more than a week without improvement. If the cases are confirmed, it will bring the number of people who have contracted bird flu during this outbreak to seven. Seasonal influenza virus circulation declined markedly in 2020-21 after SARS-CoV-2 emerged but increased in 2021-22. There are four types of influenza virus. Flu A viruses can be broken down into sub-types depending on the genes that make up the surface proteins. See who is at risk for the flu, how to avoid it or treat it. Avian influenza A viruses ca. We’ll take a look at influenza A vs. Alternative Names Annual seasonal influenza epidemics of variable severity caused by influenza A and B virus infections result in substantial disease burden worldwide. Methods: We analyzed the clinical presentation, outcomes and management of all children <16 years of age admitted to Turku University Hospital, Finland, with. National Influenza Centres (NICs) and other national influenza laboratories from 131 countries, areas or territories reported data to FluNet for the time period from 13 May 2024 to 26 May 2024* (data as of 21/06/2024 01:13:51 PM UTC). Each year, influenza causes. There were small changes to the annual recommendations around flu vaccination, including an acknowledgement of the updated flu vaccine composition for the 2023-2024 flu season and a change in the recommendations for vaccination of people with egg allergies Table 3. Influenza B is one of the most common types of flu strains. Most people with influenza have abrupt onset of respiratory symptoms and myalgia with or without fever and recover within 1. Influenza, also known as the flu, is a contagious disease that is caused by influenza viruses. The clinical influenza attack rate was high in both pandemic and seasonal. Seasonal epidemics are caused by both influenza A and B viruses; since 1968, most seasonal influenza epidemics have been caused by H3N2 (an influenza A virus). The transmissibility of these pathogens means that rapid diagnosis to allow institution of infection control procedures, and initiation of antiviral therapies if. Type C influenza usually only causes mild respiratory infections. Seasonal influenza (flu) vaccines are designed to protect against the four main groups of flu Type A and B viruses that research indicates are most likely to spread and cause illness among people during the upcoming flu seasonS. For trivalent influenza vaccines for use in the U for the 2022-2023 influenza season, depending on the manufacturing method of the vaccine, the committee recommended that the A (H1N1)pdm09, A. An annual seasonal flu vaccine is the best way to help reduce the risk of getting flu and any of its potentially serious complications. Since the initial description of influenza D virus (IDV) in 2011, the virus has been found to circulate among cattle and swine populations worldwide. The best way to reduce your risk from seasonal flu and its potentially serious complications is to get a flu vaccine every year. cute pics of pugs This page has resources to help answer your questions about flu vaccines. Influenza A and B RNA, Qualitative Real-Time PCR - This test is used to determine the presence of Influenza A or B in a patient's specimen. Other common symptoms may include: Influenza Diagnostic Tests. These 2 types of viruses cause widespread illness (epidemics) almost every winter. Maintain efficiency and productivity with a simple two-step procedure that offers accurate results in 15 minutes. We’ll take a look at influenza A vs. New for the 2022-2023 flu season, 3 flu vaccines are preferentially recommended for adults age 65 years and older: Quadrivalent high-dose. Rapid diagnostic tests with increased sensitivity are essential for the reliable detection of influenza A and B. While some people who get a flu vaccine may still get sick. Dec 30, 2023 · Flu A and flu B are both types of the influenza virus, but there are differences. Type C causes either a very mild illness or has no symptoms at all. Antiviral medicines taken within the first 2 days of illness can reduce the length and. Influenza is a communicable viral disease that affects the upper and lower respiratory tract. Mar 30, 2023 · This graphic shows the two types of influenza viruses (A and B) that cause most human illness and that are responsible for flu seasons each year. The STANDARD Q COVID/FLU Ag Combo test is a rapid chromatographic immunoassay for the qualitative detection of specific SARS-CoV-2, influenza A, and influenza B antigens present in human nasopharyngeal specimens using a single device. The influenza A and B virus genomes each comprise eight negative-sense, single-stranded viral RNA (vRNA) segments, while influenza C virus has a seven-segment genome) The eight segments of influenza A and B viruses (and the seven segments of influenza C virus) are numbered in order of decreasing length. instafeet Mainly infects pigs and cattle. Older people or people with weakened immune systems may take longer to recover. Influenza (flu) is a respiratory infection caused by a variety of flu viruses spread primarily by droplets made when infected people cough, sneeze, or talk. We’ll take a look at influenza A vs. All flu vaccines for the 2024-2025 season are anticipated to be trivalent in the United States. muscle or body aches fatigue (tiredness) some people may have vomiting and diarrhea, though this is more common in children than adults. There are three influenza vaccines that are preferentially recommended for people 65 years and older. Influenza A and B viruses have a similar structure whereby these. The influenza virus is divided into four types (A, B, C and D) by antigenic differences in their core proteins, including matrix protein (M1) and nucleoprotein (NP). In contrast, influenza C and D mainly infect birds and other animals. Influenza (flu) is a highly contagious respiratory illness. Multiplexed molecular testing on automated platforms that focus on the simultaneous detection of multiple respiratory viruses in a single tube is a useful approach for current and future diagnosis of respiratory. allied kenco Symptoms tend to develop one to two days after exposure to the influenza virus and last for between five to seven days. For most up-to-date and accurate virus data, see NCBI Virus. Flu can affect anyone but is especially serious for babies, young children, pregnant women, people. A type of influenza A infection due to the H1N1 influenza strain is commonly called the swine flu. Types A and B influenza are the more common forms of this infection, routinely causing seasonal outbreaks. Clinical Significance. COVID-19 is caused by a coronavirus called SARS-CoV-2, while flu is caused by influenza A and B viruses. Close living quarters, shared restrooms, and a lot of social activities make a college student more likely to catch. This is further highlighted by the. There are different types and subtypes of flu. Influenza A is a type of virus that causes influenza (the flu ), a highly contagious respiratory illness. September and October are the best times for most people to get vaccinated. Mar 30, 2023 · This graphic shows the two types of influenza viruses (A and B) that cause most human illness and that are responsible for flu seasons each year. Type A and B cause the annual influenza epidemics that have up to 20% of the population sniffling, aching, coughing, and running high fevers Feb 2, 2023 · There are different types and subtypes of flu. There are three types of flu viruses: A, B, and C. But they may want to give you a quick test to be sure the influenza virus is to blame. The difference between influenza A and B. They can affect different populations more severely but have the same symptoms and treatment. These viruses are transmissible through respiratory droplets expelled from the mouth and respiratory system during coughing, talking, and sneezing. IFB has two antigenically and genetically distinct lineages, B/Victoria/2/87-like (Victoria lineage) and B/Yamagata/16/88-like (Yamagata lineage). Uncomplicated influenza illness is typically characterized by the abrupt onset of constitutional and upper respiratory tract signs and symptoms (e, fever, chills, myalgia, headache, malaise, nonproductive cough, sore throat, and rhinitis).
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According to researchers, influenza A viruses are responsible for about 75% of confirmed flu cases, while influenza B viruses. Here, the performance of the Influenza A and B assay on frozen, archived nasopharyngeal swab. INTRODUCTION. The difference between influenza A and B. Mar 04, 2024 - 03:04 PM. Sites are categorized based on the current level of influenza A compared to the past levels at the same site during the 2023-2024 influenza season. Signs and Symptoms. This document provides information on molecular detection/diagnostic protocols updated as of the above date for surveillance of influenza viruses in humans. There are four main types of influenza. The Alabama Department of Public Health (ADPH) monitors the strains circulating and where disease activity is reported and updates this page during influenza season which runs from October to May. Antimicrobial Resistance is a Problem. NIAID provides information to help you see if you have a cold, the flu, or allergies. Cover your mouth with a tissue or the inside of your elbow when you cough or sneeze, and then wash your hands. Research conducted during the past several years has led to an increased. Avoid crowds. Influenza A and B are pleomorphic-enveloped viruses with a genome of 8 different (-)RNA nucleocapsid segments. The transmissibility of these pathogens means that rapid diagnosis to allow institution of infection control procedures, and initiation of antiviral therapies if. These are Fluzone High-Dose Quadrivalent vaccine Flublok Quadrivalent recombinant Influenza vaccine a nd Fluad Quadrivalent adjuvanted influenza vaccine. Flu (Influenza) Data. Combination Codes) is allowed without a practitioner order during the public health emergency for COVID-19. Issues related to clinical manifestations and diagnosis of seasonal influenza in adults will be reviewed here. The World Health Organization (WHO) today announced the recommendations for the viral composition of influenza vaccines for the 2024 influenza season in the southern hemisphere. B in terms of prevalence, how contagious they are, what the vaccine covers, and severity and recovery. Advertisement Every winter, lik. The HA and NA surface proteins of influenza viruses are “antigens,” which means they are. Influenza. We used negative stain electron microscopy, size exclusion chromatography-multi-angle laser light scattering (SEC-MALLS. Dec 2, 2022 · The flu A and B viruses that routinely spread in people are responsible for seasonal flu epidemics each year. gardner white synchrony Uncomplicated influenza. Know when to k eep kids home during flu season, and keep your community and family healthy by getting vaccinated today. The H1N1 virus (swine flu) is an infection of the nose, throat, and lungs. [2] [3] Symptoms usually appear from one to four days after exposure to the virus, and they last five to seven days. H1N1 influenza infections can cause symptoms such as rhinorrhea, cough, decreased appetite, fever, rigors, myalgia, headache, and, possibly, lower respiratory tract disease and gastrointestinal disease. Influenza A in Wastewater - Site Level. It poses a low risk to the general public. Both flu A and flu B can cause outbreaks and epidemics but only flu A causes pandemics. See who else is at risk for the flu We’re in the middle of flu season, and everyone knows theres no better place to catch the disease than on an airplane on your way to that vacation you’ve been looking forward to fo. Waner JL, Todd, SI, Shalaby H, et al. There are many H and N subtypes and each one is numbered. Even if you get the latest vaccine, you can still come. The flu can be serious for some people, but if you are otherwise fit and healthy you usually don’t need to see a doctor. escortfish minneapolis These symptoms begin one to four (typically two) days after exposure to the virus and last for about two to. H H. But health officials worry because influenza A viruses that infect birds. Influenza, commonly known as "the flu" or just "flu", is an infectious disease caused by influenza viruses. ning of the 2021-2022 influenza season rpose of this HAN Health Advisory is toRemind public health. Its virions show spherical or filamentous shapes of about 100 nm in diameter and occasionally irregular morphology, which exemplifies the pleomorphic nature of these virions. Mar 30, 2023 · This graphic shows the two types of influenza viruses (A and B) that cause most human illness and that are responsible for flu seasons each year. The flu vaccine helps prevent both. The degree of illness can range from mild to severe and can include fever, body aches, cough, headache, and sore throat. Influenza A and B tend to spread between people around the world each year. The influenza burden was similar to the burden observed and the assessed severity during the 2013-2014 season. If you have the flu, these measures may help ease your symptoms: Drink plenty of liquids. The flu vaccine helps prevent both. They can affect different populations more severely but have the same symptoms and treatment. There are two types of flu viruses that make people sick each year, influenza A and influenza B. An adjuvant is an ingredient added to a vaccine to create a stronger immune response to vaccination. action news jax anchors These 2 types of viruses cause widespread illness (epidemics) almost every winter. Other common symptoms may include: Influenza Diagnostic Tests. We’ll take a look at influenza A vs. 5% in 5-24 years, 61. Influenza A and B: A(H1), A(H1)pdm09, A(H3) SARS-CoV-2, Adenovirus, Coronavirus 229E, Coronavirus HKU1, Coronavirus NL63, Coronavirus OC43, Human Metapneumovirus, Human Rhinovirus/Enterovirus, Parainfluenza Virus 1, Parainfluenza Virus 2, Parainfluenza Virus 3, Parainfluenza Virus 4, Respiratory Syncytial Virus: NPS: Approximately 45 minutes. People die of the flu sometimes. FDA-cleared Nucleic Acid Detection Based Tests for Influenza Viruses 1 Inc. Jan 24, 2024 · Influenza A vs Types Comparison Prevention Outlook. Muscle or body aches Fatigue (very tired) Some people may have vomiting and diarrhea, though this is more common in children than adults. Some of these viruses can infect humans, and some are specific to different species. These viruses are transmissible through respiratory droplets expelled from the mouth and respiratory system during coughing, talking, and sneezing. Of the 4 types of influenza viruses, types A and B are responsible for causing yearly epidemics of respiratory disease and, occasionally, pandemics. Antiviral drugs are different from antibiotics. COVID-19 symptoms generally appear 2 to 14 days after exposure Flu symptoms usually appear about. These droplets can land in the mouths or noses of people who are nearby or possibly be inhaled into the lungs. FDA-cleared Nucleic Acid Detection Based Tests for Influenza Viruses 1 Inc. Influenza viruses can be classified according to their antigenicity into four types—A, B, C and D []. Issues related to clinical manifestations and diagnosis of seasonal influenza in adults will be reviewed here. ning of the 2021-2022 influenza season rpose of this HAN Health Advisory is toRemind public health. However, data on co-infection by influenza A and B viruses are lacking. Causes of flu-like symptoms aside from influenza include other infections, inflammatory disorders, autoimmune conditions, cancer and recent immunizations, according to Healthgrades. Older people or people with weakened immune systems may take longer to recover.
Gene reassortment has been observed in both influenza A and B. Seasonal influenza activity remains low nationally. The leaves start changing colour and flu season begins. One way flu viruses change is called “antigenic drift Drift consists of small changes (or mutations) in the genes of influenza viruses that can lead to changes in the surface proteins of the virus, HA (hemagglutinin) and NA (neuraminidase). Symptoms tend to develop one to two days after exposure to the influenza virus and last for between five to seven days. Dec 2, 2022 · The flu A and B viruses that routinely spread in people are responsible for seasonal flu epidemics each year. Some people only get mildly ill. lana rhoades masturbates There are differences between them: Signs and Symptoms. So you’ve decided to get yourself a flu shot, that’s great! According to the CDC, flu vaccinations help prevent thousands of people from flu-related hospitalizations annually In clinical trials, Xofluza shortened the length of the flu if given within two days of symptoms starting. The average incubation period for the flu is two days. During the 2020-2021 flu season, there was very low circulation of seasonal flu viruses. Mar 30, 2023 · This graphic shows the two types of influenza viruses (A and B) that cause most human illness and that are responsible for flu seasons each year. Most people get the flu when they breathe in tiny airborne droplets from the coughs or sneezes of someone who has the flu. Both COVID-19 and flu can have varying degrees of symptoms, ranging from no symptoms (asymptomatic) to severe symptoms. virtual machine browser Of these, influenza A viruses are the most pathogenic to humans and have a wide range of hosts. Influenza virus is transmitted primarily by droplets or respiratory secretions of infected persons. IFB has two antigenically and genetically distinct lineages, B/Victoria/2/87-like (Victoria lineage) and B/Yamagata/16/88-like (Yamagata lineage). Type A and B cause the annual influenza epidemics that have up to 20% of the population sniffling, aching, coughing, and running high fevers Feb 2, 2023 · There are different types and subtypes of flu. The channels are proton-selective, and a histidine and a tryptophan are the proton sensor and the channel gate, respectively. farmhouse kitchen cabinet Neither the COVID-19 pandemic nor the 1918 influenza pandemic were the only public health crises to have taken massive tolls on the United States during the last century If you’re a member of United Healthcare, you’re likely aware of the many benefits that come with your plan. Influenza viruses belong to the Orthomyxoviridae RNA virus family and are classified into 3 distinct types based on their major antigenic differences: influenza A, influenza B, and influenza C. This year's flu vaccine is only about 17% effective, compared to 39% last year. The concurrent circulation of SARS-CoV-2 with other respiratory viruses is unstoppable and represents a new diagnostic reality for clinicians and clinical microbiology laboratories. But this isn't the flu and these symptoms typically only last one to two days. Flu A viruses can be broken down into sub-types depending on the genes that make up the surface proteins. We’ll take a look at influenza A vs. Some molecular assays are able to detect and discriminate between infections with influenza A and B viruses; other tests can also identify specific seasonal influenza A virus subtypes, for example A(H1N1)pdm09, or A(H3N2).
Nov 13, 2023 · What’s the difference between influenza A and influenza B, and does it matter which you catch? Influenza A and B are the most common types of flu in humans. There are four different types of influenza viruses: Influenza A, B, C, and D. We are working to replicate the highly-used features from this resource prior to the redirection. Nov 13, 2023 · What’s the difference between influenza A and influenza B, and does it matter which you catch? Jan 24, 2024 · Influenza A vs Types Comparison Prevention Outlook. Available FDA cleared tests as of August 2020. The viruses are named for the combination of proteins, such as A (H1N1) or A (H3N2). FDA-cleared rapid molecular assays can provide results in 15-30 minutes, and some are CLIA-waived for point-of-care use. The overall health impact (e, infections, hospitalizations, and deaths) of flu varies from season to season. One of the reasons the flu remains a problem is because the viruses. This Flu Season. The assay's performance was assessed using 312. The flu is the most common vaccine-preventable disease in Australia. All flu vaccines for the 2023-2024 season will be quadrivalent (four-component). Have you heard that children who breastfeed don’t really need the flu shot? Or that good nutrition and immune support (elderberry, vitamin C, etc. Influenza A viruses are classified by subtypes based on surface proteins hemagglutinin (H) and neuraminidase (N). The influenza B virus BM2 protein does not have homology with the AM2 channel, but BM2 does have the His proton sensor, Trp gate, and is activated by low pH. You may need to change your activity level, depending on your symptoms. Influenza A viruses are further classified into subtypes, while influenza B viruses are further classified into two lineages: B/Yamagata and B/Victoria. characteristics for influenza A and B were established during February through March 2011 when influenza viruses A/California/7/2009 (2009 H1N1), A/Perth/16/2009 (H3N2), and B/Brisbane/60/2008. Dec 30, 2023 · Flu A and flu B are both types of the influenza virus, but there are differences. Different flu vaccines are approved for use in different age groups. Public health officials focus on stopping the spread of types A and B. kroger fried chicken prices 50 piece What are some misconceptions about the flu? Learn about 10 common misconceptions about the flu. B in terms of prevalence, how contagious they are, what the vaccine covers, and severity and recovery. There are four different types of influenza viruses: Influenza A, B, C, and D. Influenza virus is transmitted primarily by droplets or respiratory secretions of infected persons. Search There are three influenza vaccines that are preferentially recommended for people 65 years and older. Influenza is an acute respiratory illness caused by influenza A or B viruses that occurs in outbreaks and epidemics worldwide, mainly during the winter season [ 1,2 ]. Symptoms of COVID-19 and the flu appear at different times and have some differences. INSTRUCTIONS FOR USE. Type C leads to mild, random cases. Consider pain relievers. Influenza, commonly known as "the flu" or just "flu", is an infectious disease caused by influenza viruses. Sample-to-answer (STA) platforms based on nucleic acid amplification and detection of these viruses are simple, automated, and accurate. Everyone 6 months and older in the United States, with rare exception, should get an influenza (flu) vaccine every season. daniccooppss Influenza is an acute respiratory illness caused by influenza A or B viruses that occurs in outbreaks and epidemics worldwide, mainly during the winter season [ 1,2 ]. Virus transmission occurs through a susceptible individual's contact. Antiviral drugs work best when started early, ideally no later than two days after your flu symptoms begin. Dec 2, 2022 · The flu A and B viruses that routinely spread in people are responsible for seasonal flu epidemics each year. 1 Globally, as many as 500,000 people die annually from complications related to influenza. Seasonal influenza is an acute respiratory infection caused by influenza viruses which circulate in all parts of the world. Type A causes most influenza cases (usually more than 70% in a typical season), and most of the others are caused by type B Influenza A and B infect humans each flu season and are both highly contagious. They often lead to more people needing to go to the hospital, and more people dying from the flu. Learn if Spain was to blame for the Spanish Flu at HowStuffWorks. Influenza C usually causes only mild illness while D mostly affects animals, especially cattle. Additional information on the arrows can be found at the bottom of this page. Some molecular assays are able to detect and discriminate between infections with influenza A and B viruses; other tests can also identify specific seasonal influenza A virus subtypes, for example A(H1N1)pdm09, or A(H3N2). They can affect different populations more severely but have the same symptoms and treatment.