The Trump administration and D.C.’s top public health official had their first conversation this week about contact-tracing efforts tied to an expanding coronavirus outbreak at the White House.

The communication comes after Mayor Muriel E. Bowser sent a stern letter to the White House on Tuesday requesting a conversation about the outbreak. While the ranks of administration officials testing positive continue to grow, local leaders across the Washington region have said there’s no evidence of a widespread caseload rise tied to the outbreak.

Bowser (D) on Wednesday said the White House and D.C. Health Director LaQuandra Nesbitt discussed contact tracing the previous day, although it wasn’t clear what action might emerge from the talks.

“I can tell you that Dr. Nesbitt asked them about their processes. She shared with them our capabilities and how we could be supportive, as well, and I suspect that that dialogue will continue,” she said.

Bowser said Monday the city reached out to the White House last week about the outbreak but had received no response.

Asked Wednesday about the outbreak that involves more than a dozen people — including President Trump, first lady Melania Trump, several aides and journalists — Bowser said officials are “concerned about the spread of covid-19 in our city, regardless of where it happened.”

She encouraged anyone who works at the White House who thinks they might have been exposed to the novel coronavirus to get tested at a city-operated testing location, a private doctor or through the White House.

“All D.C. residents should recognize that D.C. Health protects their information, and so D.C. Health will not talk about a specific White House staffer to anybody,” said Bowser, who Wednesday extended the city’s public health emergency through the end of the year.

In a phone call with members of the D.C. Council, Nesbitt said she expects to have more discussions with White House officials about the outbreak.

“They have clarified for us what their contact-tracing process is, and our conversations will continue to be ongoing to ensure that we are getting all of the information that is necessary and the contact tracing and testing infrastructure is sufficient to capture everything that needs to be done,” she said.

During the call, Nesbitt noted that of 246 recent interviews with D.C. residents who have tested positive for the coronavirus, 22 percent contracted it at a workplace, 13 percent while traveling, 19 percent at a restaurant and 22 percent at a social gathering.

The Rose Garden event Sept. 26 suspected of being at the center of the outbreak came as D.C.’s seven-day rolling average of new cases dropped below 40 this month, the lowest since early July. The rolling average of new cases stood at 53 on Wednesday — the highest since Sept. 17 — stemming mostly from a one-day spike Tuesday of 105 additional cases.

The figure of 45 new D.C. cases announced Wednesday was near the city’s recent average, while the 1,014 new daily cases reported across the greater Washington region was the lowest since Sept. 28.

D.C. officials have said Tuesday’s jump could be the result of a backlog of more than 8,000 coronavirus test results the city recently received on a single day, rather than having any White House connection. Health officials said they are looking for trends in new infections but have warned against drawing conclusions after a single-day increase.

The growing spotlight on the White House outbreak has led to a rise in residents seeking coronavirus tests this week, with numbers up at the city’s free testing sites.

In response to the surge in demand at public testing locations, Bowser spokeswoman Susana Castillo said LabCorp is providing the city with 17,200 tests for the week, exceeding the 10,000 normally allotted.

Virginia Department of Health officials said Wednesday that they weren’t aware of any positive cases in the state connected to the outbreak, while Maryland health officials said they wouldn’t disclose such information.

Health officials in Maryland’s Prince George’s County said they weren’t aware of any virus infections with White House connections.

And officials in Montgomery County on Wednesday urged residents who work in the White House or U.S. Capitol, or who attended the Rose Garden ceremony, to get tested for the coronavirus.

Montgomery health officer Travis Gayles said the state’s most populous jurisdiction expects to see an increase in people getting tested and “may very well see an increase in cases secondary to those exposures.”

“We do know that over the weekend, we did have a number of folks reach out to the state and to the local jurisdiction asking where they could get tested, particularly related to rapid tests,” he said during a news conference.

County Executive Marc Elrich (D) said it’s unclear how many people connected to the White House or the Rose Garden event live in Montgomery County or have traveled to the suburb since they were possible exposed to the virus.

“I don’t know how this will transpire,” he said. “Obviously a bunch of people got infected and didn’t know about it for a while … who knows what happens in their homes and communities.”

In Washington, the city’s Alcoholic Beverage Regulation Administration said Wednesday that it is investigating after the president retweeted a video that appears to depict patrons of a downtown D.C. bar violating the city’s social-distancing guidelines.

The video appears to show three D.C. police officers walking into Harry’s Pub, about one block from Trump International Hotel. The officers are wearing masks, although few patrons have face coverings as they stand and applaud the officers while chanting “back the blue.”

Jared J. Powell, a spokesman for the Alcoholic Beverage Regulation Administration, said in an email Wednesday that the “matter has been assigned for investigation.” A person who answered the phone at Harry’s declined to comment, and no one responded to an email sent to the business.

Under the city’s Phase 2 pandemic-related restrictions, bar patrons must be seated and wear face coverings when not eating or drinking. The investigation was first reported by Washingtonian.

In addition to the 1,014 new reported infections Wednesday, the greater Washington region recorded 19 new virus-related fatalities. Virginia had 509 new cases and 12 deaths, and Maryland had 460 new cases and six deaths, while D.C. had 45 new cases and one death.

The seven-day rolling average of new coronavirus infections across Virginia, Maryland and D.C. stood at 1,390 cases Wednesday, ticking slightly downward this week after small increases last week.

In Virginia, Gov. Ralph Northam (D) announced Wednesday he will set aside an additional $12 million in federal assistance to help fund the state’s rent and mortgage relief program, aimed at keeping people from losing their homes during the pandemic.

Northam had earmarked $50 million in Cares Act money for the program in June — funds that are committed to landlords and tenants to cover rent or mortgage payments and avoid evictions, his office said. The additional $12 million will help keep up with demand as the state transitions to a program that will dispense federal money through community development block grants.

Julie Zauzmer, Erin Cox, Antonio Olivo and Gregory S. Schneider contributed to this report.