Table 1.

Details of important novel influenza

Aspects	Avian flu65–72	Swine flu 73–85
1. Pathogenic virus	H5N1 influenza virus.	Atypical H1N1 influenza virus.
2. Related animal	Avian.	Swine.
3. Disease burden	High fatality.	No high fatality.
4. Pandemic	No.	Yes (in 2009).
5. Human to human transmission	No evidence.	Strong evidence.
6. Vertical transmission	No evidence.	No evidence.
7. Clinical manifestation	Similar to classical influenza with some interesting atypical manifestations (such as diarrhea).	Similar to classical influenza with some interesting atypical manifestations (such as nonfebrile illness).
8. Viral receptor in human beings	Can be seen in lower respiratory tract.	Can be seen in upper respiratory tract.
9. Vaccine	Not available.	Has been manufactured and approved by the US FDA.86
10. Treatment by antiviral drug	Needed, usually with oseltamivir, but there are few good outcomes.	Suggested, usually with oseltamivir, good outcomes.

Abbreviation: FDA, US Food and Drug Administration.