Multiple sclerosis (MS) and other conditions affecting the immune system can activate the John Cunningham (JC) virus, causing a potentially life threatening infection. The JC virus is common ...
13don MSN
Measles is rarely seen in the United States, but Americans are growing more concerned about the preventable virus as cases ...
Symptoms typically start within 7-14 days of exposure, but also have been known to appear as long as 21 days after initial exposure.
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