Influenza A
In short
Influenza A is a highly contagious virus that causes seasonal flu in humans and can also infect animals like birds and pigs. It is known for its ability to cause large-scale global pandemics.
In plain words
This virus spreads easily through coughs and sneezes. Because it changes constantly, humans do not stay immune to it forever. This is why new vaccines are needed every year.
A simple example
A person catches a seasonal flu strain at school and spreads it to their family. This same type of virus might also be found in a local poultry farm.
Why it matters
It is a major public health concern because it can mutate into new forms that humans cannot fight easily. This makes it a primary cause of worldwide flu outbreaks.
Easy to mix up
Do not confuse it with Influenza B, which usually only affects humans and does not cause large animal outbreaks.