A British man who was vaccinated from polio has been shedding the virus for nearly 30 years.
Africa has remained polio free for a year now. If no cases are detected during next two years, the continent will be declared polio-free.
The MMR vaccine has vanquished rubella from North and South America.
The study was done after collecting samples from 25 children with sudden onset of paralysis that was suspected to be caused by the virus.
