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The School Environment
In the United States there are about 120,000 schools providing for the educational needs of approximately 54 million students. On average, students receive about 20% of their environmental exposure in schools.
Dr. Michael A. Berry
PHIL_ 2294_ lores.jpg (81 KB)
A transmission electron micrograph of smallpox viruses using a negative stain technique.
Smallpox is a serious, highly contagious, and sometimes fatal infectious disease. There is no specific treatment for smallpox disease, and the only prevention is vaccination.
Source: CDC
Link to hi-res version:
http://phil.cdc.gov/phil_images/20021108/4/PHIL_2294.tif
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