Bardhar S, Khanna A. The secondary attack rate (SAR) of SARS-CoV-2 in households: a systematic review. Int J Res Med Sci [Internet]. 2022 Jul. 27 [cited 2025 Oct. 14];10(8):1737-46. Available from: https://www.msjonline.org/index.php/ijrms/article/view/10852