Subtypes
There are many subtypes of avian influenza viruses, but only some strains of four subtypes have been highly pathogenic in humans. These are types H5N1, H7N3, H7N7, and H9N2.
Read more about this topic: Avian Influenza
Subtypes
There are many subtypes of avian influenza viruses, but only some strains of four subtypes have been highly pathogenic in humans. These are types H5N1, H7N3, H7N7, and H9N2.
Read more about this topic: Avian Influenza