Claim: Pyelonephritis is a  common lung infection to children age eight and below and is underweight, and common symptoms involve cough, weakness, lethargy, failure to thrive, fever, and night sweats.
Evidence: Pyelonephritis is inflammation of the kidney, typically due to a bacterial infection. Symptoms most often include fever and flank tenderness. Other symptoms may include nausea, burning with urination, and frequent urination.