Important announcement about the most important decisions and general preventive measures for preventing the emerging corona virus covid 19 that were taken by the seventeenth meeting of the Committee for the Management of the New Corona Crisis, held under the chairmanship of the Prime Minister on 3/30/2021, and what was stated by the head of the preventive medicine sector At the Ministry of Health, which includes instructions and preventive measures that must be followed to prevent corona virus covid 19 in the work environment