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The influenza A and B versions that can infect humans have different proteins and they behave a little differently. ... (Learn the difference between Covid-19 symptoms vs. flu symptoms.)
The CDC classifies flu viruses as A, B, C, and D. Types A and B are seasonal flu, and influenza A is broken down further into subtypes and strains. For example, current subtypes include H1N1 and H3N2.
Rapid influenza diagnostic tests (RIDTs) are a simple way of obtaining assay results, are low cost, and produce results in less than 30 minutes, so they are commonly used, but they can not distinguish between influenza A virus and influenza B virus or between influenza A virus subtypes and are not as sensitive as nucleic-acid based tests. [1] [62]
Looking into influenza B specifically, Thomas Francis Jr. isolated influenza B virus in 1936. However, it was not until 1940 that influenza B viruses were discovered. [24] In 1942, a new bivalent vaccine was developed that protected against both the H1N1 strain of influenza A and the newly discovered influenza B virus. [25]
Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza, caused either by Influenza A or by Influenza B. The season occurs during the cold half of the year in temperate regions; November through February in the northern hemisphere and May to October in the southern hemisphere.
Telling the difference between RSV, flu and COVID-19. At the onset of a virus, it’s very difficult to tell the difference between the three respiratory viruses, which all typically present like ...