Vaccinating a large portion of the population also protects those who are not vaccinated. They began by neutering and vaccinating stray dogs. Previously, vaccination teams were forbidden by militants from vaccinating children in the area. Vaccinating dogs is very effective in preventing the spread of rabies to humans. Vaccinating a large portion of the population may also benefit the unvaccinated. This includes preventive measures such as hand washing, cleaning, disinfecting, sterilizing, and vaccinating. Several zoos also have a long-standing custom of vaccinating their primates against whooping cough. Prevention of the disease in humans is accomplished by vaccinating animals against the disease. Vaccinating children may protect those around them. Otherwise they recommend vaccinating those at high risk. Vaccinating the mother during pregnancy may protect the baby. The action took form in vaccinating the population and better sanitary arrangements. Vaccinating girls around the ages of nine to thirteen is typically recommended.