3 ms·
Yes, see for example: http://www.cdc.gov/flu/professionals/vaccination/effectiveness-studies.htm http://www.cdc.gov/flu/professionals/vaccination/effectivene...
by todd8 10y ago
Yes, see for example: http://www.cdc.gov/flu/professionals/vaccination/effectiveness-studies.htm http://www.cdc.gov/flu/professionals/vaccination/effectivene...