1. “ Infectious diseases - Symptoms and causes ,” Mayo Clinic , Feb. 18, 2022 . https://www.mayoclinic.org/diseases-conditions/infectious-diseases/symptoms-causes/syc-20351173 (accessed May 12, 2022). “Infectious diseases - Symptoms and causes,” Mayo Clinic, Feb. 18, 2022. https://www.mayoclinic.org/diseases-conditions/infectious-diseases/symptoms-causes/syc-20351173 (accessed May 12, 2022).
2. Coronavirus Disease 2019 (COVID-19): A Brief Report
3. Coronavirus disease (COVID-19): How is it transmitted?;WHO;July ,2020
4. “ WHO Coronavirus (COVID-19) Dashboard | WHO Coronavirus (COVID-19) Dashboard With Vaccination Data .” https://covid19.who.int/ (accessed May 17, 2022 ). 7. P. “WHO Coronavirus (COVID-19) Dashboard | WHO Coronavirus (COVID-19) Dashboard With Vaccination Data.” https://covid19.who.int/ (accessed May 17, 2022). 7. P.
5. “ Zoonotic Diseases ,” Jul. 01, 2021. https://www.cdc.gov/onehealth/basics/zoonotic-diseases.html (accessed Dec. 18, 2022 ). “Zoonotic Diseases,” Jul. 01, 2021. https://www.cdc.gov/onehealth/basics/zoonotic-diseases.html (accessed Dec. 18, 2022).