Table 5.
Influenza pandemics in twentieth century
| Years | Influenza | Virus |
|---|---|---|
| 1918–19 | Spanish | Type A (H1N1) |
| 1957–58 | Asian | Type A (H2N2) |
| 1968–69 | Hong Kong | Type A (H3N2) |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.