influenza

For RNA viruses, such as influenza, survival is equivalent to replication.

Avian influenza viruses operate differently from human strains.

The UKHSA's Health Protection Team advised that pupils or staff who are vulnerable or immunosuppressed should seek health advice, and state that they "may have been exposed to influenza or another respiratory infection".

Epidemiologists and virologists worry that avian influenza could generate a pandemic if allowed to spread and mutate.

That drug, called CD388, is designed to prevent influenza, but is not a vaccine.