An independent data-safety monitoring board is reviewing the study subject’s illness, the company said. The company didn’t immediately disclose more information about the illness, and said it needed to respect the subject’s privacy. This is the second time trials for a Covid-19 vaccine trial have been paused over a safety concern. Last month, AstraZeneca PLC paused clinical trials of an experimental Covid-19 vaccine after a participant in a U.K. study had an unexplained illness . The U.K. study resumed, but a large U.S. study is still on hold . J&J, of New Brunswick, N.J., said illnesses and other side effects are an expected part of any clinical study, and it has prespecified guidelines to monitor for the events. More on Covid-19 Vaccine Trials The guidelines “ensure our studies may be paused if an unexpected serious adverse event that might be related to a vaccine or study drug is reported, […]