Pfizer stops enrollment in Paxlovid trial in standard-risk population

Pfizer Inc said it would halt enrollment in a trial for its COVID-19 antiviral drug, Paxlovid, in standard-risk patients after a study revealed the treatment was not effective in reducing symptoms in that group. The drug has emergency use authorization for high-risk groups in which it has been effective in reducing hospitalizations and deaths. The new data, however, showed a 51% relative risk reduction in standard-risk groups, which the company said was not statistically significant.