An increasing number of parents in Oregon are choosing not to vaccinate their children, according to the Oregon Health Authority.

With hospitalizations and at least nine confirmed cases, health officials race to contain a growing outbreak in a community with low vaccination

Measles is one of the most infectious known diseases. The virus spreads through the air and can linger in the airspace of a room for up to two hours after an infected person has left. Nine out of 10 unvaccinated people exposed to the virus will fall ill.