COVID-19 cases in Canada, but does that number paint the real picture?Only a fraction of the population has actually been tested for the infection, but antibody testing may soon give us a better idea of how widely the coronavirus has spread.“What these sero-prevalence studies will tell is how many people not necessarily got sick, but how many people have seen the virus, developed antibodies against the virus,” explained Andres Finzi, the Canada Research Chair in Retroviral Entry and a researcher at the University of Montreal Hospital Centre.Evidence of your immune system’s response is found in your blood, so a partnership between public health officials and Quebec’s blood donation agency Hema-Quebec became a natural fit.