Through research on monkeys he developed a method for determining how the polio virus entered the human body.

He was also among the scientists who identified the three types of polio virus.

S. haemorrhoidalis has also been found to carry polio virus.

So epidemiologists must check each case for polio virus as they try to rule out other causes.

After five or more hours, complete, assembled polio viruses appeared in the mixture.

A hundred million crystallized polio viruses could cover the period at the end of this sentence.

In addition, those who received the Salk vaccine could pass on the polio virus.

Nigeria is also one of last countries in the world with wild circulating polio virus.

In the West, they can live for years, with a few of them shedding polio viruses all the while.

It was the first of its kind in Australia and could be used on the polio virus.