1. Ten great public health achievements;Koppaka;MMWR Morb Mortal Wkly Rep,2011
2. Principles and lessons from the smallpox eradication programme;Henderson;Bull World Health Organ,1987
3. Challenges in infant immunity: implications for responses to infection and vaccines;PrabhuDas;Nat Immunol,2011
4. Mass vaccination: when and why;Heymann;Curr Top Microbiol Immunol,2006
5. Immunisation and herd immunity;Anderson;Lancet,1990