Altimmune Inc., a clinical stage biopharmaceutical company in Gaithersburg, Maryland, announced, July 13, positive results from the preclinical studies of its Covid-19 vaccine candidate AdCOVID, which is being tested at the University of Alabama at Birmingham. In the multi-billion dollar sweepstakes for Covid-19 vaccines and treatments, the Altimmune/UAB candidate is among the leading 62 percent…