The aim was to induce immunity to Measles earlier, as cases in young children had been causing alarm.

The vaccine - which consists of whole, dead leprosy bacilli - should induce immunity in the subjects.

He has induced immunity in guinea pigs, he said.

The vaccine is delivered containing the live protozoa to induce immunity without acute disease.

Historical records show a method of inducing immunity was already known.

Infection with v. minor induces immunity against the more deadly variola major form.

So instead of inducing immunity they induce tolerance.

Both vaccines have been used for decades to induce immunity to polio, and to stop the spread of the infection.

Unfortunately, by themselves they cannot induce immunity satisfactorily.

Infection with pertussis induces incomplete natural immunity that wanes over time.