Health department workers interact with a shopkeeper during a door to door survey for tuberculosis and leprosy, at Dharavi in Mumbai.

A girl wearing a mask waits after giving her blood sample for the serological survey at an Anganwadi Center, in New Delhi.

A health worker holds a test tube before collecting a blood sample for the serological survey at an Anganwadi Center, in New Delhi.

A health worker collects a blood sample of a woman for a serological survey at an Anganwadi Center, in New Delhi.