Zinc supplementation promotes a th1 response and improves clinical symptoms in fewer hours in children with pneumonia younger than 5 years old. A randomized controlled clinical trial.  Acevedo-Murillo et al., 2019 [266]  Mexico  103 children hospitalized for pneumonia  10 mg/day if <1 year; 20 mg/day if >1 year during hospital stay  Quicker improvement in clinical status, oxygen saturation and respiratory rate. Patients’ baseline zinc levels were below normal range.