https://www.sciencedaily.com/releases/2020/05/200514115834.htm

In an article published today in Cell Host and Microbe, Professor Subbarao stressed the importance of detecting a neutralising antibody response in recovered COVID-19 patients, and of studies of COVID-19 vaccines in animal models.

Neutralising antibodies prevent infection by binding to a virus and blocking their ability to infect. After an infection, a host can produce neutralising antibodies to protect against future infection.