We are in a city where more than 90 percent of the population has defenses against the measles, which means that they either had the disease, survived, and developed natural defenses; or that they had been immunized against measles.
Estamos numa cidade, onde mais de 90% da população têm defesas contra o sarampo, o que significa que já tiveram a doença e desenvolveram defesas naturais, sobreviveram ou foram imunizados contra o sarampo.