A resident (C) prepares to register herself for receiving a dose of the Covid-19 coronavirus during a mobile vaccination drive by army health officials in Colombo on August 12, 2021. (Photo by Ishara S. KODIKARA / AFP)

A resident (L) prepares to register herself for receiving a dose of the Covid-19 coronavirus during a mobile vaccination drive by army health officials in Colombo on August 12, 2021. (Photo by Ishara S. KODIKARA / AFP)

Army health officials walk through an alley during the Covid-19 coronavirus mobile vaccination drive for residents of a locality in Colombo on August 12, 2021. (Photo by Ishara S. KODIKARA / AFP)

A resident (C) prepares to register herself for receiving a dose of the Covid-19 coronavirus during a mobile vaccination drive by army health officials in Colombo on August 12, 2021. (Photo by Ishara S. KODIKARA / AFP)

A resident (R) prepares to register himself for receiving a dose of the Covid-19 coronavirus during a mobile vaccination drive by army health officials in Colombo on August 12, 2021. (Photo by Ishara S. KODIKARA / AFP)

An army health official (R) inoculates a woman with a dose of the Covid-19 coronavirus during a mobile vaccination drive in Colombo on August 12, 2021. (Photo by Ishara S. KODIKARA / AFP)

Residents watch army health officials (not pictured) conducting the Covid-19 coronavirus mobile vaccination drive in a locality in Colombo on August 12, 2021. (Photo by Ishara S. KODIKARA / AFP)

Army health officials walk through an alley during the Covid-19 coronavirus mobile vaccination drive for residents of a locality in Colombo on August 12, 2021. (Photo by Ishara S. KODIKARA / AFP)

Gravediggers remove a coffin containing an unclaimed body from a hearse at the General Cemetery in Colombo on August 13, 2021, as Sri Lanka have begun disposing unclaimed bodies as the number of virus-related deaths rose more than three times to over 150 a day compared to the previous week. (Photo by ISHARA S. KODIKARA / AFP)

A Police health official inoculates a man with a dose of the Sinopharm vaccine against the Covid-19 coronavirus at a vaccination camp held in Colombo on August 14, 2021. (Photo by ISHARA S. KODIKARA / AFP)

A Police health official inoculates a woman with a dose of the Sinopharm vaccine against the Covid-19 coronavirus at a vaccination camp held in Colombo on August 14, 2021. (Photo by ISHARA S. KODIKARA / AFP)

A Police health worker prepares a dose of the Sinopharm vaccine against the Covid-19 coronavirus at a vaccination camp held in Colombo on August 14, 2021. (Photo by ISHARA S. KODIKARA / AFP)