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What is A 6-year-old girl has a blotchy, reddish-brown rash on her face, trunk, and proximal extremities that developed over the course of 3 days. On physical examination, she has 0.2-cm to 0.5-cm ulcerated lesions on the oral cavity mucosa and generalized tender lymphadenopathy. A cough with minimal sputum production becomes progressively worse over the next 3 days. Which of the following viruses is most likely to produce these findings? and explain in detail?
The rash and the Koplik spots on the buccal mucosa are characteristic findings in measles (rubeola), a childhood infection. It occurs only sporadically when immunizations have been administered to a large part of the population. The severity of the illness varies, and measles pneumonia may complicate the course of the disease, which in some cases can be life-threatening. Mononucleosis, which results from Epstein-Barr (EBV) virus infection, is more likely to occur in adolescence. Mumps produces parotitis and orchitis. Varicella-zoster virus infections in children manifest as chicken-pox. Rubella, also called German measles, is a much milder infection than rubeola.