References
Cholera. [Online]. WHO information. <http://www.who.int/inf-fs/en/fact107.html> (1999, Oct. 9).
“Immunization rate is up to record level in U.S.” (1999, Sept. 26). Star Tribune.
Influenza. (Online). WHO information. <http://www.who.int/inf-fs/en/fact211.html> (1999, Oct. 9).
“Notice to readers: National vaccination coverage levels among children aged 19-35 months.” MMWR Weekly. 1999, September 24.
Revkin, A. C. 1999, October 4. “Mosquito virus exposes the whole in the safety net.” New York Times.