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Reference.org
Postvaccinal encephalitis
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<p>Postvaccinal encephalitis (PVE) is a rare <a href="/facts/Complication_(medicine)/uJHvzqUt">complication</a> which was associated with <a href="/facts/Vaccination/3SfpzPsd">vaccination</a> with <a href="/facts/Vaccinia_virus/jSgHWq2k">vaccinia virus</a> during the worldwide <a href="/facts/Smallpox_eradication/cxNeetP4">smallpox eradication</a> campaign. With mortality ranging between 25 – 30% it is the most severe adverse event associated with this vaccination. The mechanism of how it happens is unknown. </p>