How to prevent COVID-19?

More than 3.5 million people worldwide have been diagnosed with covid-19. Clinical trials of vaccines and related drugs are already underway in countries, but how can ordinary people and health care workers in hospitals prevent covid-19 without specific drugs?Studies have shown that vitamin D intake can reduce the risk of respiratory infections, and that it can reduce the risk during outbreaks.

These mechanisms include inducing antimicrobial peptides and defense hormones, slowing the rate at which the virus replicates, reducing the concentration of pro-inflammatory cytokines, which produce inflammation that damages the lining of the lungs and leads to pneumonia, and increasing the concentration of anti-inflammatory cytokines.