Vaxart Inc. investors who stuck by company shares Feb. 3 had to swallow a bitter pill – watching shares of the oral vaccine developer (NASDAQ:VXRT) fall 57.8% to $9.85. Driving the trade in part was news that, during a phase I trial, neutralizing antibodies to SARS-CoV-2 were not detected in most of the five subjects given two doses of VXA-CoV2-1, its oral recombinant protein vaccine for the potential prevention of SARS-CoV-2 infection. Furthermore, the company concluded it was "unable to evaluate" a study of the candidate organized by Operation Warp Speed.