A 12 yr old boy presents with acute onset of morbilliform rash, fever, malaise and plight is. These manifestation began 1 week after starting treatment with ampicillin for streptococcal laryngitis. His temperature is 38.8C, blood pressure 115/76mm Hg, pulse is 95/min, and respiratory rate 16/min. Urinalysis shows microhematuria, leukocyturia with numerous eosinophils and occasional white blood cells casts. Proteinuria is absent. Blood studies show elevated antistreptolysin tigers and moderate eosinophils. BuN is 42mg/do, and serum creatinine is 2.5mg/do. Which of the following is the most likely diagnosis?
- Acute interstitial nephritis.
- Acute pyelonephritis .
- Acute tubular necrosis .
- Hench schonlein purpura.
- Post streptococcal glomerulonephritis.
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