Nigeria

Measles

Regression of Hodgkin's disease after measles. 1981, Tagi, Lancet

A similar case in Nigeria in 1981.
A case of curing lymphoma after measles in Cuba in 1949 was also recorded.

Tetanus

Neonatal tetanus anti-immunization and protective antitoxin antibody. 1995, de Moraes-Pinto, J Infect Dis

20 babies got admitted into a hospital in Nigeria with neonatal tetanus. Mothers of six of them have been vaccinated with at least two doses of the vaccine during pregnancy. All mothers and babies, including the unvaccinated ones, had the antibodies at a much higher than the protective level (0.07 IU/ml and above). Mortality rate among unvaccinated was 43%. Mortality rate among vaccinated was 50%.
However, there also exists a study proving that 2-3 vaccines during pregnancy significantly reduce the incidence of neonatal tetanus. On the other hand, vaccination increased mortality from other causes by 18%.