Exclusive breastfeeding reduces Rotavirus diarrhea in Brazil by 90% vs. a 40% reduction in Rotavirus diarrhea by vaccination in Mexico.
The studies discussed in the article above:
Gulland A. Rotavirus vaccine cuts deaths of Mexican babies from diarrhoea by 40%. BMJ 2010;340:c511
Maranhão HS, Medeiros MC, Scaletsky IC, Fagundes-Neto U, Morais MB. The epidemiological and clinical characteristics and nutritional development of infants with acute diarrhoea, in north-eastern Brazil. Ann Trop Med Parasitol. 2008 Jun;102(4):357-65.
Horton S, Sanghvi T, Phillips M, Fiedler J, Perez-Escamilla R, Lutter C, Rivera A, Segall-Correa AM. Breastfeeding promotion and priority setting in health. Health Policy Plan. 1996 Jun;11(2):156-68.