Kaidar, E. K., A. K. Turgambayeva, B. S. Zhussupov, B. S. Serik, and M. K. Zhanaliyeva. “Secondary Attack Rate of the COVID-19: General Characteristics of Confirmed and Probable Cases”. International journal of health sciences 6, no. 3 (September 29, 2022): 1468–1482. Accessed July 17, 2024. https://sciencescholar.us/journal/index.php/ijhs/article/view/13082.