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The number of known coronavirus cases in the District, Maryland and Virginia stood at 2,934 on Monday, with 1,414 cases in Maryland, 1,021 in Virginia and 499 in the District. The regional total of virus-driven deaths also rose, increasing to 27 in Virginia, 17 in Maryland and 9 in the District, for a total of 53 fatalities.

Here are some of the most significant and recent developments as the region responds to the pandemic of the novel coronavirus, which causes the disease covid-19:

• Maryland Gov. Larry Hogan (R), Virginia Gov. Ralph Northam (D) and D.C. Mayor Muriel Bowser (D) each issued mandatory stay-at-home orders that prohibit residents from leaving home, except for trips considered essential, such as venturing out for food and medicine.

• Maryland opened three virus testing sites for people at high risk at vehicle emission testing locations. The state opened a fourth virus testing site in the parking lot of FedEx Field in Prince George’s County.

• Three people within Maryland’s state prison system have tested positive for covid-19, officials said. A corrections spokesman said the total includes one inmate and two “non-correctional contract employees.”