When Satyaki Mitra's father developed a mild fever in mid-March, the graduate student in Philadelphia wasn't especially worried. He told his 57-year-old father, living in the eastern Indian city of Kolkata, to get tested for the new coronavirus.

The initial test came back negative, but Samir Kumar Mitra's condition steadily worsened.

On Monday, two days after testing positive for the virus, Samir died, plunging his family into grief and triggering a public backlash that has left his 27-year-old son stunned.