Fever stops and rash begins is diagnostic of-: (A) Fifth disease, (B) Roseola infantum, (C) Measles, (D) Toxic shock syndrome
Answer is B. Ans. is 'b' i.e., Roseala infantum Roseola infantum (Sixth disease or exanthem subitum) It is caused by human herpes virus-6 (HSV-6) Similar illness is caused by Parvovirus B-19 and Echovirus. o Age group involved is 6 mt to 3 yr. o Incubation period --> 5 to 15 days. Clinical manifestations Abrupt onset with high grade fever, mild pharyngitis and Coryza. The temprature conies down rapidly in 3 to 4 days when a macular or maculopapular rash appear, staing from trunk and sometimes extending to the extremities and face. Rash lasts for 24 hours, and disappear in 1-2 days without pigmentation or desequamation. o There is occipital and post-auricular lymphadenopathy.