ahlam1399
08-15-2015, 05:08 PM
The Success Of The Chickenpox Vaccine Shows The Power Of Herd Immunity
http://img-s-msn-com.akamaized.net/tenant/amp/entityid/BBlKvCU.img?h=100&w=100&m=6&q=60&o=f&l=f&x=322&y=259Cases of chickenpox hospitalizations are decreasing, even among unvaccinated populations, suggesting herd immunization is working.
http://img-s-msn-com.akamaized.net/tenant/amp/entityid/BBlKvCU.img?h=100&w=100&m=6&q=60&o=f&l=f&x=322&y=259Cases of chickenpox hospitalizations are decreasing, even among unvaccinated populations, suggesting herd immunization is working.