O. Bilukha, and N. Rosenstein. MMWR. Recommendations and Reports: Morbidity and Mortality Weekly Report. Recommendations and Reports / Centers for Disease Control, 54 (RR-7):
1--21(May 2005)PMID: 15917737.
R. Brooks, C. Woods, D. Benjamin, and N. Rosenstein. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 43 (1):
49--54(July 2006)PMID: 16758417.
D. Caugant. Infection, Genetics and Evolution: Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases, 8 (5):
558--65(September 2008)PMID: 18479979.