Potential role of Bacillus Calmette-Guérin (BCG) vaccination in COVID-19 pandemic mortality: Epidemiological and Immunological aspects.

SARS-CoV-2 had already killed more than 400,000 patients around the world according to data on 7 June 2020. Bacillus Calmette-Guérin (BCG) vaccine is developed from live-attenuated Mycobacterium bovis, which is a microorganism found in a cow. Discovered by Dr.

Effects of secondhand smoke exposure on asthma morbidity and health care utilization in children: a systematic review and meta-analysis.

Background: Secondhand smoke (SHS) exposure can trigger asthma exacerbations in children. Different studies have linked increased asthma symptoms, health care use, and deaths in children exposed to SHS, but the risk has not been quantified uniformly across studies.

Objective: To perform a systematic review and meta-analysis to evaluate and quantify asthma severity and health care use from SHS exposure in children.