Influenza type B viruses are not classified by subtype and do not cause pandemics. Different strains of the flu virus mutate over time and replace the older strains. This is why it's important to ...

Spanish flu pandemic was caused by a particularly virulent strain of influenza virus. It infected 500 million people, caused ...

Interactions Between Flu Subtypes Predict Epidemic Severity ... 2023 — A new study of the strain of influenza A responsible for the 2009 H1N1 pandemic -- pdm09 -- shows that the virus has ...

The first outbreak of H5N9 bird flu in poultry has been reported in California on a duck farm leading to the culling of ...

While the H5N1 bird flu keep spreading, the first reported H5N9 outbreak in the United States has been identified on a duck farm in California.

Influenza and other respiratory illnesses held a strong grip on Arkansas and Texas near the end of January, according to the recent health data from both states.

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A rapidly-spreading H5N1 avian influenza, otherwise known as bird flu, has been devastating bird flocks and showing signs of spreading to other mammals.

The spread of H5N1 into new species alarms researchers who say it could reassort in a new species, like pigs, leading to more ...

The H5N9 strain of avian influenza is much more rare than the H5N1 which has been responsible for most of the reported human ...

Different combinations of these give rise to the influenza A virus subtypes, including the H1N1, H2N2 and H3N2 subtypes that have afflicted humankind for over 100 years. The influenza vaccine was ...