Adham ZS, Al-Ghurabi BH. Prevalence of viral co-infection among COVID-19 cases in association disease severity and oral hygiene. J Bagh Coll Dent [Internet]. 2021 Sep. 15 [cited 2024 Nov. 2];33(3):1-8. Available from: https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/2947