Johnson & Johnson's Janssen COVID-19 Vaccine , Approved In UK.<br />Janssen's single-dose coronavirus vaccine <br />has been approved for use in the U.K. .<br />BBC News reports vaccine trials showed it to be 85% effective in stopping severe illness from COVID-19, and it has met expected safety standards.<br />The vaccine by Janssen, the pharmaceutical arm of Johnson & Johnson, reportedly uses the same technology as the Oxford-AstraZeneca vaccine. .<br />Over 38 million people, or almost , three-quarters of the adult population, , have already received a first vaccine dose in the U.K.<br />The Janssen single-dose jab is currently being tested <br />as part of a U.K. study to determine whether a third dose <br />could help protect against newly-emerging variants