Countries around the world are buying antibody tests to figure out how many of their citizens were infected with Covid-19 with the idea it can help strategize against a second wave of the virus. Tel Aviv University is working the Israeli Defense Force soldiers to detect antibodies and the country's immune response to the coronavirus. FOX's Trey Yingst spoke with Professor Ariel Munitz and Professor Motti Gerlic, of  Tel Aviv University, who are both working to develop a better test for Covid-19 antibodies.