https://www.cdc.gov/coronavirus/2019-ncov/community/organizations/meat-poultry-processing-workers-employers.html :ةحات ا•ةخسنلا
https://www.cdc.gov/niosh/worklife/newsletter/NWLnewsV1N3.html
https://www.cdc.gov/niosh/worklife/newsletter/NWLnewsV1N3.html