Lack of efficacy for the risk (search Vioxx deaths) and antibody dependent enhancement both require significant time to observe. https://www.npr.org/2007/11/10

Lack of efficacy for the risk (search Vioxx deaths) and antibody dependent enhancement both require significant time to observe. https://www.npr.org/2007/11/10/5470430/timeline-the-rise-and-fall-of-vioxx https://www.npr.org/2007/11/10/5470430/timeline-the-rise-and...