New Delhi: The case of a Delhi policeman having a relapse of the novel coronavirus has baffled experts and the doctors treating him and have raised the question whether a recovered patient can contract the infection again.

The policeman, 50, had tested positive for the virus in May and was treated at the Indraprastha Apollo hospitals between May 15 and 22. Thereafter, he had tested negative and resumed duty. However, on July 10, he again felt unwell with a fever and dry cough and got himself tested on July 13.