Serological Survey in Delhi September 3, 2020 by Minhaj Adnan New Delhi: A health worker collects a blood sample of a woman for a serological survey at an Anganwadi Center, in New Delhi, Thursday, Sep 3, 2020. (PTI Photo/Manvender Vashist) New Delhi: A girl wearing a mask waits after giving her blood sample for the serological survey at an Anganwadi Center, in New Delhi, Thursday, Sept. 3, 2020. (PTI Photo/Manvender Vashist) New Delhi: A health worker collects a blood sample of a woman for a serological survey at an Anganwadi Center, in New Delhi, Thursday, Sept. 3, 2020. (PTI Photo/Manvender Vashist) 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, Thursday, Sept. 3, 2020. (PTI Photo/Manvender Vashist) (PTI03-09-2020_000079B)