Johnson & Johnson, one of the companies working on developing a vaccine for the novel coronavirus, announced Monday that it has put a temporary hold on the phase 3 trial of one possible vaccine.
The move comes after a participant in the trial came down with an "unexplained illness."
A company statement about the situation explained that "adverse events – illnesses, accidents, etc. - even those that are serious, are an expected part of any clinical study, especially large studies."
The statement also noted that company guidelines dictate "studies may be paused if an unexpected serious adverse event (SAE) that might be related to a vaccine or study drug is reported, so there can be a careful review of all of the medical information before deciding whether to restart the study."