Gupta, Nitin, Neelam Gulati, Surinder Kumar Singhal, Varsha Gupta, Sohini Walia, Diljot Sandhu, and Isha Dhawan. “Comparative Study of Nasopharyngeal Swab, Oropharyngeal Swab and Oral Saliva for the Diagnosis of COVID-19”. International Journal of Recent Advances in Multidisciplinary Topics 6, no. 11 (November 11, 2025): 20–22. Accessed November 16, 2025. https://journals.ijramt.com/index.php/ijramt/article/view/3153.