4 ms·
H1N1 mostly affected people under 25. https://www.cdc.gov/h1n1flu/surveillanceqa.htm https://www.cdc.gov/h1n1flu/surveillanceqa.htm
by castratikron 7y ago
H1N1 mostly affected people under 25.
https://www.cdc.gov/h1n1flu/surveillanceqa.htm https://www.cdc.gov/h1n1flu/surveillanceqa.htm