Measles, rubella, erythema infectiousum and roseola infantum are part of the six classic childhood exanthems, and have very distinct and recognizable features. The eruption when aminopenicillins ...
Measles IgM can usually be detectable after the first 3 days of the exanthem. In roseola, after an incubation period of 5–15 days, infected children develop high fevers that last 3–5 days.