coronavirus before a vaccine arrives has faced resistance from the U.S. government and drugmakers, according to an investigation by the Los Angeles Times.Doctors and experts say an upper-arm shot using the antibody-rich blood plasma of Covid-19 survivors could inoculate people against the virus for months, but federal officials and companies have failed to act, the newspaper said.Federal officials have twice rejected requests to discuss the proposal and pharmaceutical companies have declined to design or manufacture the shots even as they acknowledge the likely efficacy of the plan, the Times reported.