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D.C. health officials added eight states Monday to the city’s list of locations considered “high-risk” for travel because of the coronavirus pandemic, raising the total number of states under the designation to 39 as new cases continue to surge across the country.

The growing number of states on the city’s travel advisory would mean three in four residents of the country are required to quarantine before nonessential travel in the nation’s capital. It comes amid record rates of infection in several states and elevated levels of spread across the Washington region.

A state is considered high-risk if its seven-day rolling average of new coronavirus cases is 10 or more per 100,000 people. Under an order from Mayor Muriel E. Bowser (D), anyone who comes to the city from a high-risk state for nonessential reasons must self-quarantine for two weeks.

Those who arrive in D.C. from one of the states for essential purposes are asked to self-monitor for symptoms for two weeks.

No states were removed from the list Monday, but Arizona, Colorado, Connecticut, Massachusetts, Michigan, Ohio, Pennsylvania and Rhode Island were added. Maryland and Virginia remain exempt from the order.

“We still see about a quarter of our cases related to travel,” Bowser said, suggesting residents adhere to guidance the city will release in the coming days on Thanksgiving and holiday season travel. “We continue to emphasize to D.C. residents to avoid unnecessary travel.”

About 243 million Americans — roughly 75 percent of the population — live in states that are included in the city’s travel advisory. About 85 million people live in states that aren’t part of the advisory, with most of them in California and New York.

D.C. health officials on Monday also unveiled a new contact-tracing tool, called the DC Covid Alert Notice (DC CAN), meant to inform residents if they were potentially exposed to the coronavirus.

Residents with a smartphone will receive a push notification beginning Tuesday asking them to opt in to voluntary exposure notifications, D.C. Health Director LaQuandra Nesbitt said. iPhone users will be able to opt in through their phone’s settings, while Android users will be prompted to download an app.

The service creates private, random Bluetooth “keys” for each phone user and shares that data with other DC CAN users nearby, Nesbitt said, including strangers encountered in a park or restaurant. Residents who test positive for the coronavirus will be given a code by D.C. health officials to enter into the service, which will notify everyone who received that individual’s Bluetooth key during the previous 14 days.

Nesbitt emphasized that the technology does not track location and said people who test positive for the coronavirus are not identified to other users, or to Apple or Google.

She said that DC CAN works with tracing tools in other states that use the same platform but noted that Maryland doesn’t have such an exposure notification tool and Virginia has a state-specific app that is not compatible with D.C.’s system.

“This tool will only be useful if we have widespread participation,” Nesbitt said. “So we need as many people to opt in.”

The rolling seven-day average of new daily infections across Virginia, Maryland and D.C. on Monday stood at 1,703. Daily caseloads rose during much of October but have plateaued at an elevated rate for about a week.

Health experts have warned for months that colder weather could prompt people to spend more time indoors — increasing the potential for the virus’s spread — as outdoor social activities become less appealing. The regional rise has coincided with an outbreak in coronavirus cases at the White House, although local health officials said there is no clear connection.

As the holiday season approaches, health experts are warning that small gatherings are the source for much of the virus’s recent spread.

Neil J. Sehgal, an assistant professor of health policy and management at the University of Maryland School of Public Health, said caseload trends show that it is “less safe to travel now than it was a month ago” and that “it will be less safe in a month than it is today.”

On Maryland’s Eastern Shore, Gov. Larry Hogan (R) announced Monday the creation of a $10 million relief fund to provide support to poultry growers and farmers affected by the pandemic.

Hogan made the announcement with Delaware Gov. John Carney (D), who announced the creation of a twin program in his state. Poultry workers in both states have experienced coronavirus outbreaks, which had the ripple effect of hurting the industry.

“Far too often our farmers don’t get the respect or the appreciation they deserve, but I want our entire agriculture community to know that your commitment to our state and to our agriculture industry does not go unnoticed,” Hogan said at a news conference in Hurlock after a roundtable discussion with farmers.

Under the program announced Monday, the Maryland Department of Agriculture will issue direct payments of $1,000 per poultry house, up to five houses per farm. Growers who lost chickens will be eligible for an extra $1,500 per house.

The program will also provide a 15 percent bonus to Maryland farmers who received federal funding in the first round of payments. Federal funding is not available to contract poultry workers.

The greater Washington region recorded 1,212 additional coronavirus cases and 28 new deaths Monday. Virginia on Monday added 690 new coronavirus cases and 24 deaths, Maryland added 497 cases and four deaths, and D.C. added 25 cases and no deaths.

The region’s number of new cases Monday was the lowest in a single day across the region since Oct. 7.

Here are the states that require a quarantine: Alabama, Alaska, Arizona, Arkansas, Colorado, Connecticut, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Mexico, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, West Virginia, Wisconsin and Wyoming.