“These additional cases of measles should be highly concerning for anyone who is not vaccinated with MMR. Measles is a serious disease, one which can lead to dangerous complications, even death,” said Kathleen E. Toomey, M.D., M.P.H. “The MMR vaccine is safe and about 97% effective in preventing measles. Vaccination is strongly advised for individuals not only to protect themselves, but to protect vulnerable populations - such as infants who are too young to be vaccinated and those who cannot be vaccinated for medical reasons.”