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Will mothers be willing to have their children get a vaccine that provokes these reactions? The investigators think so. In fact, it would seem that the reactions are a good thing: they constitute evidence that the vaccination has taken. And despite high temperatures, the vaccinated children did not get sick enough to be kept in bed. They played games as usual. Most important, from the physicians' point of view, they did not develop the coughs, runny noses and stuffed-up heads of real measles—so often the forerunners of pneumonia. On the basis of early tests, neurologists believe that the vaccine, which has caused no encephalitis in monkeys, also protects the -human brain against viral invasion and damage.