Comparative Study of Influenza Virus and Parainfluenza 3 Virus as Causative Agents of Upper Respiratory System in Thi-Qar Province. UTJsci [Internet]. 2022 Dec. 25 [cited 2024 Dec. 26];9(2):21-8. Available from: http://mail.jsci.utq.edu.iq/index.php/main/article/view/899