Summer may decide fate of leading shots in vaccine race People on six continents already are getting jabs as the race for a COVID-19 vaccine enters a defining summerPeople on six continents already are getting jabs in the arm as the race for a COVID-19 vaccine enters a defining summer, with even bigger studies poised to prove if any shot really works -- and maybe offer a reality check. Many scientists don’t expect a coronavirus vaccine to be nearly as protective as the measles shot. If the best COVID-19 vaccine is only 50% effective, "that’s still to me a great vaccine,” said Dr. Drew Weissman of the University of Pennsylvania. “Nothing is going to be easy.”The Oxford shot, with a 10,000-person study underway in England, already encountered that hurdle. EXPECT IMPERFECT PROTECTIONAnimal research suggests COVID-19 vaccines could prevent serious disease but may not completely block infection.

Source: ABC News June 28, 2020 12:22 UTC