Ring vaccination is a strategy to inhibit the spread of a disease by vaccinating those most likely to be infected, targeting the contacts of confirmed patients and the people in close contact with those contacts, so that everyone who has been or could have been exposed to a patient receives the vaccine, creating a ring of protection that can limit the spread of a pathogen. The strategy requires thorough and rapid surveillance and epidemiologic case investigation, and the Intensified Smallpox Eradication Program used it with great success in eradicating smallpox in the latter half of the twentieth century.
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Ring Vaccination
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FAQs
How soon after exposure can a smallpox vaccine still help?
CDC says within 3 days of exposure the vaccine might protect, and within 4 to 7 days it likely gives some protection.
The US Centers for Disease Control and Prevention says that if the smallpox vaccine is given within 3 days of exposure to the virus, it might protect the person from getting the disease, and that someone who still gets sick may be much less sick than an unvaccinated person. Between 4 and 7 days after exposure it likely gives some protection.
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Ring vaccination, vaccinating contacts around a case, was the key strategy in the eradication of smallpox.
Sources
1. Wikipedia
Wikipedia contributors, Wikimedia Foundation
Ring vaccination (Wikipedia)
https://en.wikipedia.org/wiki/Ring_vaccination, lead sectionQuote, https://en.wikipedia.org/wiki/Ring_vaccination, lead section
Ring vaccination is a strategy to inhibit the spread of a disease by vaccinating those who are most likely to be infected.
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