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D.C. health officials on Tuesday added Montana and Ohio to the list of states considered “high-risk” due to the coronavirus pandemic, marking the latest step in the city’s attempt to mitigate transmission of the virus.

A state is deemed high-risk if its seven-day rolling average of new coronavirus cases is 10 or more per 100,000 residents. Anyone who arrives in the nation’s capital after traveling to one of the 29 states for nonessential reasons must self-quarantine for two weeks.

As those two states were added, Alaska and Arizona were removed from the list.

D.C. reported 47 new coronavirus cases and no deaths on Tuesday, while the city’s seven-day average of new cases has fallen to 45 — a level last seen two months ago — amid a steady drop in infections.

Across the greater Washington region, health officials recorded 1,239 new infections and five deaths Tuesday. Virginia added 836 cases and two deaths, while Maryland had 356 cases and three deaths.

The region’s daily caseload was the smallest in a single day since Aug. 19, even as the seven-day average of 1,640 cases is up from August lows of fewer than 1,500 daily cases.

Maryland, which moved to the third phase of recovery on Friday, has seen its seven-day average increase from 511 at the end of August to 625 on Tuesday. Caseloads in Virginia have generally held steady in recent days.

In Arlington County, residents who live in areas disproportionately affected by the coronavirus will get new services aimed at controlling the spread of the pandemic, officials announced Tuesday.

The county government, public schools and the state Department of Emergency Management will bring testing, information and personal protective equipment to areas identified as having an increased risk of transmission of the virus.

Schools will distribute about 11,000 informational kits that will include cloth face coverings, hand sanitizer and multilingual information about coronavirus-related support for rent and food assistance.

A sample testing and collection site will be set up at Arlington Mill Community Center along Columbia Pike, starting Sept. 14, on the second and fourth Monday of each month from 1 to 7 p.m. It will also be open from 8 a.m. to noon on the first Saturday of each month.

The county also plans to distribute information, hand out mask kits and offer a one-day testing event to vulnerable communities, although other details weren’t released Tuesday.

“We will not beat this pandemic without providing equitable access to the conditions needed to control and prevent covid-19 spread,” Reuben Varghese, director of the county’s Public Health Division, said in a statement. “Our residents most at risk for covid-19 exposure need this further increase in testing access to identify cases and their close contacts.”