WEST LEBANON — As of Thursday, Grafton County has “medium” levels of COVID-19, according to the Centers for Disease Control and Prevention.

That’s up from a “low” level the week prior. Other Upper Valley counties, New Hampshire’s Sullivan County and Vermont’s Windsor and Orange counties, remain at “low,” the CDC said.

When levels of COVID-19 in a community are at “medium,” the CDC recommends that people at high risk of serious illness consult their health care provider about whether to wear a mask in public.

At “low” levels, people should wear masks based on their own preference, informed by their personal level of risk, according to the CDC.