27 févr. 1979 - Polio
Description:
Since 1979, no cases of Polio have originated in the United States. The virus though has been brought into the country by travelers; the last act of such occurring in 1993.(from https://www.cdc.gov)
Ajouté au bande de temps:
Date:
27 févr. 1979
Maintenaint
~ Il y a 46 ans