General Discussion

Measles is suspected to be associated with a form of immunity amnesia. Having had the disease can cause a patient’s immune response to other diseases to fall short.

“The measles virus can deplete previously acquired immune memory by killing cells that make antibodies, and thus weakens the immune system, which can cause deaths from other diseases. Suppression of the immune system by measles lasts about two years and has been epidemiologically implicated in up to 90% of childhood deaths in third world countries, and historically may have caused rather more deaths in the United States, the UK and Denmark than were directly caused by measles. Although the measles vaccine contains an attenuated strain, it does not deplete immune memory.”

Source: https://en.wikipedia.org/wiki/Measles

Also, measles is one of the most contagious diseases known for a variety of reasons.