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תבנית:תמונה מומלצת 5 באפריל 2009
HE
Template:POTD/2009-04-05
Picture of the day archives
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Picture of the day
A doctor administers a
typhoid fever
vaccination
at a rural school in
San Augustine County, Texas
, April 1943. Vaccination is the administration of
antigenic
material (the
vaccine
) to produce
immunity
to a disease. It is considered to be the most effective and cost-effective method of preventing
infectious diseases
.
Photo credit:
John Vachon
,
FSA
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