PTI.An expert from the Maharashtra government's task force said this was not unusual as a recipient of coronavirus vaccine does not develop immunity immediately.The doctor, 46, working at the BYL Nair hospital tested positive for the deadly virus nine days after he received the first dose of Covishield vaccine, an official of the Brihanmumbai Municipal Corporation said.Dr Ramesh Bharmal, dean of the hospital, told PTI that the doctor tested positive last week but now he has recovered from the infection and is expected to join work soon.Dr Om Shrivastav, an infectious diseases expert who is also a member of the state government's task force on coronavirus, said a person can be infected with coronavirus even after getting a vaccine.