Updated at 8:11 p.m.: Revised to include Ellis County.

Texas reported its biggest one-day increase in deaths from the new coronavirus on Thursday, a day before some businesses across the state will be allowed to reopen their doors to customers.

Also Thursday, Dallas County reported its highest one-day increase in coronavirus cases as its death toll surpassed 100.

Texas has reported 782 deaths from COVID-19, including 50 that were added to its total Thursday. Across the state, 28,087 positive coronavirus cases have been reported.

Dallas County reported five more deaths, bringing its total to 104. Those deaths did not appear in Texas’ total from the state health department; the state’s data may not include every county’s most up-to-date case counts because of differences between when Texas and individual counties report coronavirus data.

The latest Dallas County deaths include three residents of long-term care facilities in Dallas, as well as a Balch Springs man in his 20s and a Dallas man in his 60s. The long-term care residents were a man in his 70s who had an underlying health condition, a woman in her 80s and a woman in her 90s.

Health officials didn’t identify the facility or facilities where those residents lived. About 40% of the 104 deaths in Dallas County have been tied to long-term care facilities.

The county also reported 179 new positive cases, bringing the total to 3,531.

Dallas County Judge Clay Jenkins said in a statement that the increase in cases stems from a change in guidelines by the Centers for Disease Control and Prevention, which allows grocery and big-box store employees to be tested without symptoms at the county’s drive-through locations.

Jenkins urged people to limit unnecessary shopping trips and avoid crowds “in this worsening situation.”

Beginning Friday, some businesses — such as malls, restaurants and movie theaters — may reopen under certain conditions, according to an order from Gov. Greg Abbott.

“With the governor’s order set to open still more businesses tomorrow, your smart decisions to protect you, your family and the community are more important than ever," Jenkins said. “It’s beautiful weather, and we’ve been cooped up for over a month, but the underlying advice based on science from the health experts has not changed."

Dallas Mayor Eric Johnson said on Twitter that it’s unclear whether the higher number of cases Thursday “is because numbers are actually growing or simply because we tested more people.”

As of Wednesday, Dallas County’s health department had conducted 2,123 tests and private labs had conducted 15,248 tests since March 13. Of those tests, 14,332 have been negative.

Those numbers don’t include the results of more than 17,000 tests conducted through Tuesday at community-based testing sites at American Airlines Center and Ellis Davis Field House, since those tests are conducted in a lab outside the city of Dallas, according to the mayor’s office.

Because criteria for testing has changed along with the number of available tests during the coronavirus pandemic, Dallas lacks an accurate picture of case growth over time, Johnson said on Twitter.

“But here’s what doesn’t lie,” he said. “The number of beds and ventilators available in our hospitals.”

Johnson referenced a recent uptick in intensive care unit beds and ventilator usage at Dallas hospitals, saying it could be extrapolated that the increase is probably tied to more hospitalizations due to coronavirus, rather than a lifting of a ban on elective surgeries, since that shouldn’t have led to a spike in the use of ICU beds or ventilators.

On Wednesday, 550 of the city’s 827 total ICU beds were in use. Hospitals across Dallas were also using 330 of 943 available ventilators Wednesday.

A week earlier, 505 ICU beds and 294 ventilators were in use.

Among people who have been hospitalized for COVID-19 and reported their employment in Dallas County, about 79% have been “critical infrastructure workers," which the county defined as people who work in health care, transportation, food and agriculture, public works, finance, communications, clergy, first responders and other essential workers.

Most Dallas County COVID-19 patients who have required hospitalization have either been over 60 or have had at least one known high-risk chronic health condition, officials said. Diabetes has been an underlying health condition in about a third of hospitalized patients.

Tarrant County

Tarrant County reported seven more COVID-19 deaths Thursday, bringing its total to 68.

All seven were Fort Worth residents with underlying health conditions: a man in his 50s, three men in their 70s, two women in their 80s and a woman in her 90s.

The county has reported a total of 2,246 positive cases, including 97 new cases Thursday.

The county also reported that 485 people have recovered from the virus.

“We are again saddened to report more deaths in our community,” Tarrant County Health Director Vinny Taneja said in a written statement. “It underscores our responsibility to work together to protect everyone, especially those who are most vulnerable.”

Collin County

Collin County reported 14 new cases Thursday, bringing its total to 724.

The county has reported 20 deaths of people with COVID-19, including the most recent death of an 83-year-old Plano woman who died at Medical City Plano after testing positive for the virus on April 21.

“It is always sad to learn of the death of another member of our Collin County community,” Collin County Judge Chris Hill said in a written statement. “We extend our deepest sympathies to her family and friends.”

The county has also reported 496 recoveries from the virus.

Denton County

Denton County reported another COVID-19 death Thursday, bringing the toll to 21.

The patient was a man over 80 years old who lived at the Denton Rehabilitation Center, health officials said. He had been previously hospitalized.

“As we report the loss of a 21st life to COVID-19 in Denton County today, please keep the family in your thoughts and prayers,” Denton County Judge Andy Eads said in a statement.

The county also reported 17 new cases, bringing its total to 765.

Denton County will have its first drive-through testing site from 8 a.m. to noon Saturday, at 535 S. Loop 288 in Denton. It will offer up to 200 tests.

To get a test, a person must have shown symptoms of COVID-19 in the last week, such as a cough, fever, shortness of breath, muscle pain, sore throat or loss of smell or taste. Anyone wishing to be tested must call 940-349-2585 to register in advance.

Rockwall County

Rockwall County officials said Thursday that 91 residents had tested positive, two more than when the county last reported its data Tuesday.

The county also reported its second death from the virus. No details about that patient were available.

Thirty-six of the county’s COVID-19 patients have recovered from the illness.

Ellis County

Ellis County officials are reporting 12 new positive cases, bringing the countywide total to 179.

Three of the new cases are residents of the Legend Oaks Healthcare and Rehabilitation facility in Waxahachie — two women, ages 69 and 81, and a 93-year-old man —raising the facility’s total positive cases to 26.

The other nine cases are spread throughout the county, including a 64-year-old man and a 62-year-old woman living in a Bardwell residence, and a 71-year-old male and a 68-year-old female living in a Midlothian residence.

The rest include a 41-year-old Ennis woman, a 19-year-old Ferris woman, a 42-year-old woman in Red Oak and a 26-year-old man and a 48-year-old woman in Waxahachie.

Kaufman County

Officials in Kaufman County reported the county’s first coronavirus-related death Thursday.

According to inForney.com, the victim was a man who lived at Ridgecrest Healthcare & Rehabilitation Center in Forney. Representatives for Nexion Health, which operates the facility, did not respond to a request for comment.

The county also recorded three new cases, raising its total to 86. Fifty of those patients are presumed to have recovered, according to the county’s data.

Johnson County

One more Johnson County resident has tested positive, officials said Thursday.

The county has had 82 total cases, with four deaths and 45 patients released from isolation.