We investigated the air of patient rooms with confirmed COVID 19 in the largest hospital in Iran, on March 17, 2020. To collect the SARS CoV 2 particles, ten air samples were collected into the sterile standard midget impingers containing 20 mL DMEM with 100 g mL streptomycin, 100 U mL penicillin and 1 antifoam reagent for 1 h. ...Fortunately, in this study all air samples which were collected 2 to 5 m from the patients' beds with confirmed COVID 19 were negative. ...