Rapid Antigen Kits to conduct Covid test at home got a green signal on Wednesday and the Indian Council of Medical Research -- the nodal body in the fight against the virus -- issued detailed guidelines on who can use it and how. The ICMR has made it clear that only symptomatic individuals and immediate contacts of people who tested positive in the laboratory should use the home test. "Indiscriminate testing is not advised," the top medical body said.