contagious and full of viruses breath of sneezing or coughing person

2019ncov airborne bacteria bacterium biohazard breath cloud concept contagious contaminant corona coronavirus cough covid danger dangerous disease droplet epidemic flu hazard healthcare infected infection infectious influenza medical medicine microbe mouth ncov open oral pathogen patient person respiration respiratory sick sneeze spread sputum symptom transmitted tuberculosis unhealthy unhygienic vector viral virus