The 33-year-old man from Thane district in Maharashtra who was found to be infected with the Omicron variant of coronavirus is a marine engineer by profession.Due to the odd nature of his job he couldn't get vaccinated while on the ship since April despite his efforts, a Kalyan Dombivli Municipal Corporation (KDMC) official said on Saturday.The man, a resident of Kalyan-Dombivli municipal area near Mumbai, had arrived at the Delhi airport from South Africa via Dubai before flying to the Maharashtra capital before he was tested positive for the Omicron variant of coronavirus, making him the first such case in Maharashtra and fourth in India, officials had said on Saturday."He was working on a private merchant navy ship and left the country in April when the second wave of COVID-19 pandemic was at its peak. At that time, vaccine doses were available only for healthcare and frontline workers," the official told PTI.The man tried his best to get a vaccine shot at some port but due to several restrictions and strict measures regarding the administration of jabs, he couldn't succeed, the official said."He remained on the ship till November-end. As his ship arrived in South Africa, he was allowed to return to the country (India) and his employer arranged a return ticket for him. As he was out on the sea for a long time, he could not get vaccinated. By the time he could get his tickets and the visa to travel back to India, he had been infected by the Omicron variant," the official said.His case is very unfortunate as vaccine shots are available in abundance in the last some months but he missed taking them due to his odd job profile. He is a marine engineer by academic qualification, the official said.The patient has been kept in Kalyan-based COVID care centre but isolated from other patients as a precaution, she added.Meanwhile, KDMC commissioner Vijay Suryavanshi on Saturday asked citizens to not panic and strictly adhere to COVID-19 norms.He said the civic corporation had examined the taxi driver in whose vehicle the patient had travelled to Dombivli. Also, the occupants of the entire building where he is living have been tested. They all tested negative for COVID-19, Suryavanshi said.