Nation Coronavirus updates: Top Kamala Harris staffer tests positive; blood type may play role in contracting virus October 15, 2020October 15, 2020Jessica Flores, USA TODAYComments Off on Coronavirus updates: Top Kamala Harris staffer tests positive; blood type may play role in contracting virus Top Kamala Harris staffer tests positive. Studies suggest people with O-type blood may have lower chance of contracting COVID. Latest news.