Answer :USMLE step 2 Mcq 247:A three year old boy develops itchy red spots on his tummy




Correct Answer: E

A mild fever starts fifteen to twenty days after being infected and lasts about three days. A rash appears, usually on the trunk, spreading to the rest of the body. It starts as itchy red spots which gradually form blisters. These break and scab over. The scabs fall off within ten days. The fluid in the blisters, like the saliva, is loaded with virus particles, so the sufferer is infectious from two days before the rash appears until the last spot has scabbed over.


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