Here is a question I got recently that I want to publicly respond to:
Is the measles outbreak that occurred in Disney Land of a different strain than what’s in the vaccine? Are those who are vaccinated not protected?
The measles virus has many different genotypes, but only one serotype. When you say, “different strain,” that means different variation in genotype.
The virus can vary a bit genetically, but they all “look” the same when it comes to our immune systems. When a virus is all of the same serotype, they have the same antigens (proteins that our bodies recognize and make an immune response to) on the outside.