March 5: Gov. Larry Hogan announces the first three positive cases of COVID-19 in Maryland: a couple in their 70s and a woman in her 50s. All residents live in Montgomery County and contracted the coronavirus after a cruise on the Nile.
March 8: Hogan announces two more cases of COVID-19 in the state. A Harford women in her 80s was hospitalized after contracting the disease while traveling. A Montgomery man in his 60s was briefly hospitalized but released after contracting the coronavirus while traveling. At this time 52 other Maryland residents tested negative for COVID-19.
March 9: Prince George’s County Executive Angela Alsobrooks announces that a Prince George’s resident also contracted the disease while in Boston, giving Maryland its sixth case.
March 10: Hogan announces Maryland’s ninth case, a Montgomery County woman in her 60s who contracted the virus on the same Nile River cruise as other Maryland residents. Two more Prince George’s County residents also contracted the disease through travel.
March 11: A Montana resident tested positive while visiting Anne Arundel County. Despite testing positive in Maryland, the case is classified as a Montana case, giving Montana’s its first case.
Hogan also announced three more cases, bringing the state up to 12. A Montgomery County man in his 20s contracted the disease while traveling in Spain. A Baltimore County man in his 60s contracted the coronavirus after working at the American Israel Public Affairs Committee in Washington, D.C. Neither are hospitalized.
A Prince George’s man in his 60s is currently hospitalized with COVID-19. He is the first case of community spread in Maryland, meaning the origin of his disease is unknown.
March 13: Hogan announced five additional cases, although he did not reveal where the cases were or the details of the cases. A Carroll County also has a positive cases, said Carroll County Sheriff Jim DeWees, making the sixth case announced Friday. Prince George's County Executive Angela Alsobrooks told NBC4 that it now has six cases: a man in his 40s that was exposed to the county's first confirmed case, a woman in her 30s and a man in his 50s.
The woman's case is currently under investigation. The man in his 50s is related to the woman and is currently hospitalized out-of-state, according to NBC4.
Generally, cases are classified by where the person lives not where they are tested.
March 14: An additional 11 cases are announced via Twiiter by Mike Ricci, communications director for Hogan.
March 15: Five new cases reported in Maryland, bringing total to 31. Hogan announces the Maryland Health Department resource page has been updated and now has a map that shows what counties have cases and how many. The map can be found at: https://coronavirus.maryland.gov
Howard County later announced its first positive case of coronavirus, bringing the total in the state to 32.
The patient is a woman in her 80s who has an underlying health condition and is in the hospital, Howard County Executive Calvin Ball said in a press conference on Sunday.
March 16: Frederick County announces its first case, bringing the state up to 38 cases. The Frederick County case is a woman in her 30s who is recovering at home. She did not have a travel history but was in close contact with someone who did travel to an area with cases of COVID-19, Frederick County Health Officer Dr. Barbara Brookmyer said during a press briefing.
Howard County also announced three more cases, with Baltimore's mayor announcing later in the evening a second case in the city. That made 42 cases by the end of the day.
March 17: Maryland Department of Health said there were 57 cases Tuesday morning. However, the numbers did not account for a Howard County case and the second Baltimore case.
Carroll County Times reported a second case in Carroll bringing the total number of confirmed cases to 60.
The numbers only reflect the number of confirmed cases. The Maryland Department of Health is not releasing the number of negative tests or number of people tested due to private laboratories also conducting tests.
March 18: The Maryland Department of Health reported 85 cases Wednesday morning. However, the numbers left off a second Carroll County case reported Tuesday.
Hogan announced the first state death related to COVID-19, a man in his 60s who had underlying health conditions.
March 19: The Maryland Department of Health reported 107 cases of COVID-19 Thursday morning.
Wicomico and Worcester counties both announced their first cases Thursday. Carroll County announced a third.
Howard County also announced that a 5-year-old child, who attends Elkridge Elementary School, was diagnosed with COVID-19.
March 20: The Maryland Department of Health reported 149 confirmed cases of COVID-19, as of 10 a.m. Friday.
This includes the first case of an infant with COVID-19 and a teenager with the disease.
The health department does not release data on number of people tested or those who receive negative test results.
Frederick County continues to have one confirmed case.
A Baltimore County man in his 60s, with underlying health conditions, died from COVID-19 Friday, the state's second COVID-19-related death.
March 21: The Maryland Department of Health reported 190 confirmed cases of COVID-19, as of 10 a.m. Saturday.
Confirmed cases jumped by 42, as the health department incorrectly gave Carroll County a fourth case Friday.
The state health department announced late Saturday night that a Montgomery County woman in her 40s, with underlying medical conditions, died from COVID-19, the state's third death.
Several counties, including Washington County, announced their first confirmed cases of COVID-19.
Frederick County continues to have one confirmed case.
March 22: The Maryland Department of Health announced that the state has 244 confirmed cases of COVID-19.
The numbers did not include a case in Queen Anne's County announced Saturday, making the total 245.
Frederick County announced its second case, a man in his 20s with no underlying medical conditions. He recently travelled abroad and is recovering at home, according Rissah Watkins, director of the Frederick County Health Department's planning, assessment and communication.
March 23: The Maryland Department of Health announced 288 cases Monday morning. The number does not include two new Frederick County cases announced Monday morning.
The two new Frederick County cases are both women, one in her 20s, one in her 30s. Both cases are community spread, which are the first two cases of community spread in the county.
March 24: The Maryland Department of Health announced 349 confirmed cases of COVID-19 Tuesday morning. Between 10 a.m. Monday and 10 a.m. Tuesday, cases in the state jumped 62, the state's largest increase so far.
However, numbers are expected to increase as testing becomes more available.
A Prince George's man in his 60s, with underlying health conditions, died from COVID-19, according to the state health department. His death is the fourth in the state and second in Prince George's County.
Kent County reported its first case.
March 25: The Maryland Department of Health reported 423 confirmed cases of COVID-19. The numbers do not include a Frederick County case reported Wednesday.
The number of cases in Maryland increased by 75, the largest increase so far in the state during the COVID-19 pandemic.
Frederick County announced four new cases, all of which are due to community spread. The cases are a woman in her 40s, two men in their 50s, a woman between 65 and 69 years old. All four cases are recovering at home.
During a press conference Wednesday, Fran Phillips, deputy secretary of Public Health Services, said that of the 423 cases, 17 people have recovered. That includes a Frederick County case.
March 26: The Maryland Department of Health reported 580 confirmed cases of COVID-19. Of the 580 cases, 23 people have recovered and four have died.
Frederick County reported 5 new cases, to bring the total of cases to 13. One Frederick resident recovered from the disease and was released from self-isolation.
The state numbers incorrectly gave an extra case to Frederick County that should have been counted as a Carroll County one, Watkins said. The state numbers also did not include a fifth Cecil County case and three Carroll County cases, making the total 583.
March 27: Frederick County now has 20 cases, according to the Frederick County Health Department.
Cases in Frederick County increased by seven from Thursday to Friday.
The Maryland Department of Health reported 774 confirmed cases of COVID-19, including a new death, bringing the total to five deaths in the state. Details of the fifth death were not immediately known. It is not a Frederick County case, Watkins said.
The state numbers did not include four Carroll County cases or five Frederick County cases announced Friday afternoon, bringing the total to 783.