H3N2
H3N2 is a subtype of the influenza A virus, which is known to cause seasonal flu outbreaks in humans. It is characterized by its ability to mutate, leading to variations that can affect its spread and severity. H3N2 is particularly notable for its impact on older adults and those with weakened immune systems.
The virus is transmitted through respiratory droplets when an infected person coughs or sneezes. Vaccines are developed annually to help protect against H3N2 and other flu strains, but the effectiveness can vary based on how well the vaccine matches circulating virus strains.