Slightly more than one per cent of Ontarians – roughly 160,000 people – were infected and had recovered from the novel coronavirus by the end of June, Public Health Ontario says after conducting tests on thousands of blood samples.
The agency said that of more than 7,000 blood samples tested during the month of June, 79 showed the presence of COVID-19 antibodies, indicating a prevalence of 1.1 per cent when adjusted to the characteristics of Ontario's population.
The lab also found a great disparity in the presence of antibodies between different regions of the province.Whereas in northern and eastern Ontario, they believe only 0.3 per cent of people have been infected. A similar serological study conducted in New York found up to 20 per cent of people in the New York City area showed the presence of COVID-19 antibodies, even though less than three per cent of residents ever tested positive during PCR testing.
There also people who do not develop enough antibodies after fighting an infection to be detected in a blood test.
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