India lost a top doctor, Dr. KK Aggarwal, to Covid-19 on Monday night. This has now raised questions on vaccine efficacy as he had taken both doses of the vaccine by February, and also on the vulnerability of frontline workers in the 2nd Covid wave. On India Today's special show News Today watch 2 top doctors - oncologist Dr. Arvind Kumar and IMA national president Dr. JA Jayalal explaining the possible reasons behind why Dr. KK Aggarwal would have succumbed to Covid-19 despite being fully vaccinated.