Moderna has produced a vaccine that works specifically against the South African variant of coronavirus, with trials due to start in the United States. Photograph:  Frederic Brown/AFP via Getty Images

Moderna has produced a vaccine that works specifically against the South African variant of coronavirus, with trials due to start in the United States(...)

Scientist Xinhua Yan works in the Moderrna lab. The company  reported antibodies in all patients and no safety issues in an early clinical trial. Photograph:  David L. Ryan/The Boston Globe via Getty Images

Moderna’s potential Covid-19 vaccine produced immune responses in patients in the early stage trial, according to results published in a peer-reviewed(...)