The government has placed a purchase order with Biological E for five crore doses of its Covid vaccine Corbevax, which are expected to arrive by the end of February and boost the availability of jabs under its corona-immunisation programme. The government may also use the vaccine to expand its vaccination drive to cover adolescents below 15 years since most states are reopening schools, sources have said. The government has placed a purchase order with Biological E for five crore doses of its Covid vaccine Corbevax, which are expected to arrive by the end of February and boost the availability of jabs under its corona-immunisation programme. The government may also use the vaccine to expand its vaccination drive to cover adolescents below 15 years since most states are reopening schools, sources have said.