A homemade sign on Route 22 in Gorham urges police and ambulance first responders to "stay strong" amid the coronavirus pandemic on Sunday.

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Another 29 cases of the new coronavirus have been confirmed in Maine.

Nirav Shah, the director of the Maine Center for Disease Control and Prevention, said Monday that there are now 499 cases spread across 15 Maine counties. That’s up from 470 on Sunday.

Of those, 92 Maine residents have been hospitalized with COVID-19, the illness caused by the coronavirus, while another 158 have fully recovered from it, Shah said.

The death toll in the state stands at 10. The most recent death, a man in his 70s from York County, was confirmed Saturday.

“Our thoughts and prayers continue to go to the families of those who are grieving that loss, and we remain focused on helping everyone affected by COVID-19 make a full and complete recovery,” Shah said via videoconference from the Maine Emergency Management Agency headquarters in Augusta.

[Our COVID-19 tracker contains the most recent information on Maine cases by county]

A majority of the cases have been in Maine residents over age 50, while they are evenly split between women and men, according to the Maine CDC.

No outbreak has been reported within the Maine prison system, though the Maine Department of Corrections reports it has tested 14 inmates. Of those, 10 have come back negative, while another four await results. Four adults and one juvenile have been isolated within the system, according to the department.

Monday’s increase comes as the state enters its first full week under a new stay-at-home order meant to curb the virus’ spread since the first case in Maine was confirmed almost four weeks ago.

So far, the coronavirus has hit hardest in Cumberland County, where 249 cases have been confirmed. It is one of only two counties — the other is York County, with 108 cases — where “community transmission” has been confirmed, according to Shah.

There are two criteria for establishing community transmission: at least 10 confirmed cases and that at least 25 percent of those are not connected to either known cases or travel. Shah said last week that second condition has not yet been “satisfied” in other counties.

Other cases have been detected in Androscoggin (23), Aroostook (1), Franklin (5), Hancock (2), Kennebec (23), Knox (9), Lincoln (9), Oxford (11), Penobscot (25), Sagadahoc (13), Somerset (4), Waldo (5) and Washington (1) counties. Information about where another 11 cases were detected was not immediately available Monday.

The only county without a confirmed case is Piscataquis.

Shah cautioned Monday that the scope and depth of the outbreak is unknown and urged Maine residents to take steps to protect themselves from the coronavirus.

“In any outbreak situation, we are only seeing a fraction of the cases that are out there. … Even if you happen to be in a county where community transmission hasn’t been detected, even though there have been cases, or you’re in a county where there aren’t that many cases yet, what we know from other outbreaks is that there are almost certainly cases around you,” he said.

As of early Monday afternoon, the coronavirus has sickened at least 338,995 people in all 50 states, the District of Columbia, Puerto Rico, Guam, the Northern Mariana Islands and the U.S. Virgin Islands, as well as caused 9,683 deaths, according to Johns Hopkins University of Medicine.

Watch: 6 ways you can prevent COVID-19