Johnson & Johnson has paused its COVID-19 vaccine study because a participant in the study developed an unexplained illness. The company sent a document to outside researchers saying that the online system for enrolling patients in the 60,000-patient clinical trial has been closed. The data and safety monitoring board for the trial will be convened. (STAT)

Eli Lilly’s COVID-19 vaccine has also been paused due to safety concerns. The drugmaker’s treatment is part of the National Institute of Health’s “Activ” program and is to be used in combination with remdesivir. (Bloomberg)

Facebook is banning anti-vaccination ads on its platform. Ads about government policies on vaccines will be still be allowed. (CNBC)

A 25-year-old Nevada man is the first American confirmed to have contracted the coronavirus twice. The man had no known health problems aside from the virus and has since recovered from his second infection. (USA Today)

Delays in colorectal cancer screenings because of the COVID-19 pandemic could result in higher rates of advanced-stage cancer and death, according to a study to be published in the UAEG Journal. The death rate would increase by almost 12% if screenings are delayed for more than a year, compared with a delay of fewer than three months. (WebMD)