ahlam1399
09-17-2015, 09:11 PM
Public health officials were surprised last year when the dominant strain of circulating flu mutated after the flu vaccine had been formulated. The current version looks like a better match.
أكثر... (http://www.npr.org/sections/health-shots/2015/09/17/441140896/cdc-says-flu-vaccine-should-be-more-effective-this-season?utm_medium=RSS&utm_campaign=news)
أكثر... (http://www.npr.org/sections/health-shots/2015/09/17/441140896/cdc-says-flu-vaccine-should-be-more-effective-this-season?utm_medium=RSS&utm_campaign=news)