Scientists in Class 3 Outbreak serve no purpose except to be rescued. You don't have to rescue the scientists if you don't want to. On the mini map, scientists appear as a yellowish square with an S in the middle. If a scientist is bit or scratched, there is nothing you can do, as they will turn into a zombie. Their zombie form is skinny male in a white shirt and the top of the shirt and head are bloody. There are no female scientists. Scientists seem to be always a white male.