The agent
Genetic sequencing shows a new sub type of influenza A (H1N1) virus with segments from four influenza viruses: North American Swine, North American Avian, Human Influenza and Eurasian Swine.

Host Factors
The majority of these cases have occurred in otherwise healthy young adults.

Transmission
The transmission is by droplet infection and fomites.

Incubation Period
1-7 days.

Communicability
From 1 day before to 7 days after the onset of symptoms. If illness persist for more than 7 days, chances of communicability may persist till resolution of illness. Children may spread the virus for a longer period.

There is substantial gap in the epidemiology of the novel virus which got re-assorted from swine influenza.