Comparative analysis of various clinical specimens in detection of SARS-CoV-2 using rRT-PCR in new and follow up cases of COVID-19 infection: Quest for the best choice. oleh Kuldeep Sharma, Pragya Aggarwala, Deepa Gandhi, Anuniti Mathias, Priyanka Singh, Somya Sharma, Sanjay Singh Negi, Anudita Bhargava, Padma Das, Ujjwala Gaikwad, Archana Wankhede, Ajoy Behra, Nitin M Nagarkar