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. 2011 Dec 1;174(Suppl 11):S4–S15. doi: 10.1093/aje/kwr307

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American Journal of Epidemiology © The Author 2011. Published by Oxford University Press on behalf of the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

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Figure 2. — Number of epidemic-assistance investigations by US state, the District of Columbia (DC), and Puerto Rico, 1946–2005. The numbers exclude 25 epidemic-assistance investigations whose scope was national. Many investigations were multisite. CT, Connecticut; DE, Delaware; MA, Massachusetts; MD, Maryland; NJ, New Jersey; NYC, New York City; RI, Rhode Island.