Positive confirmed cases of the novel coronavirus in Clark County topped 100 over the weekend, according to public health officials, though no new deaths were reported.

The tally of confirmed cases stood at 110 as of Monday morning. The true number of those infected is likely much higher, experts say, because tests for COVID-19, the disease caused by the virus, have been inaccessible to many.

Clark County saw a large jump in cases last week, in part because testing has become more widely available, said county health officer Alan Melnick, but also because the illness is likely spreading in the community.

“We don’t know which is the bigger factor for the increase,” he said.

Washington has been one of several epicenters of the virus in the United States with nearly 5,000 cases and more than 200 deaths, as of Monday morning. Oregon has had more than 600 confirmed cases and 16 deaths.

-- Kale Williams; kwilliams@oregonian.com; 503-294-4048; @sfkale

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