Because there are so many domestic cats and dogs who are not vaccinated, there are frequent outbreaks of serious disease across the country. (affordableanimalclinic.com)
While the virus usually remains dormant, it causes frequent outbreaks. (herpesdatingservices.com)
A recent study suggests more than half of American travelers aren't vaccinated for measles before traveling abroad despite frequent outbreaks in Western Europe and Asia. (pointsmilesandmore.com)