Call the teacher and tell the teacher directly that the child has been to the hospital and prescribed medicine. In order not to affect the health of other students, he chose to practice at home and asked the teacher for leave. The full name of influenza A virus is influenza A virus, and the subtype of influenza A virus is avian influenza. Influenza A virus is a very common influenza virus, which is highly pathogenic to human beings and has caused many worldwide pandemics.