Epidemic roseola and Measles

Epidemic roseola noun - A contagious viral disease that is a milder form of measles lasting three or four days; can be damaging to a fetus during the first trimester.

Measles and epidemic roseola are semantically related. In some cases you can use "Measles" instead a noun phrase "Epidemic roseola".

Measles noun - An acute and highly contagious viral disease marked by distinct red spots followed by a rash; occurs primarily in children.

Epidemic roseola and measles are semantically related. Sometimes you can replace phrase "Epidemic roseola" with "Measles", this terms are similar.