A second COVID-19 vaccine in the late stages of its study has been put on pause.
Johnson & Johnson is investigating after one of the study's participants came down with an unexplained illness. The company is looking into whether the illness is connected to the vaccine.
Johnson & Johnson said pauses like this are expected as part of the process, but it did not release any details about the illness.
Final testing for a vaccine created by AstraZeneca is still on hold in the U.S. as officials investigate an illness connected to that study as well.