Residents of Marin County hamlet may have no COVID-19 antibodies.
Few if any residents of the tiny Marin County hamlet of Bolinas have antibodies for COVID-19, researchers reported Thursday., were tested in late April both for the coronavirus and its antibodies. Residents raised money for the tests, and UC San Francisco subsidized the project.
No one tested was found to have an active case of the disease, and the results of the antibody tests show that between zero and three in 1,000 people in Bolinas were previously infected, UCSF infectious disease researchers said. “Our goal with this study was to understand how widely the novel coronavirus had spread in a relatively isolated community like Bolinas before or soon after the stay-home orders went into effect,” said Dr. Bryan Greenhouse, a professor at UCSF.
The results “suggest that few if any people in Bolinas had ever been infected by the virus as of the end of April,” he added.Researchers analyzed 1,880 blood samples, using two different tests to look for antibodies, and combined results from the two tests to statistically estimate population-level infection rates.
“It is quite possible that no people in Bolinas were ever infected,” Greenhouse said in an interview.“While the antibody tests we used are amongst the most accurate available, no test is perfect, and individual results should be taken with a grain of salt,” he said.
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