Updated at 5:40 p.m.: Revised to reflect additional details about the patient’s activity after her release from isolation.

The mayor of San Antonio declared a public health emergency in the city Monday, a day after officials announced that a woman was “mistakenly released” from isolation Saturday before a lab test showed she tested positive for coronavirus.

The patient was one of 91 evacuees who were brought to San Antonio from Wuhan, China. She was released Saturday and was in the community for a little more than 12 hours before she was quarantined again.

During that time, the woman checked in to a Holiday Inn hotel near the San Antonio airport about 3 p.m. and took a hotel shuttle about 5:15 p.m. to the North Star Mall, said Dr. Anita Kurian of the city’s Metropolitan Health District.

Kurian said the health department completed its risk assessment of any people the woman could have exposed to the virus and determined that everyone was at low risk, except for health-care personnel who were in direct contact with the woman when she was released.

San Antonio Mayor Ron Nirenberg said the Centers for Disease Control and Prevention “mistakenly released” the woman from quarantine at the Texas Center for Infectious Disease. He said it was unacceptable that the CDC released the patient before all of her test results were received.

"We simply cannot have a screw-up like this from our federal partners,” Nirenberg said at a news conference Monday.

Texas Gov. Greg Abbott blamed federal officials for negligence after the woman’s release and called on the CDC to boost testing requirements in response.

The CDC said the patient had been treated at a local medical facility for several weeks after she returned from Wuhan on a flight chartered by the State Department.

“At the time of discharge from the facility, the patient was asymptomatic and met all of CDC’s criteria for release — resolution of any symptoms and two consecutive sets of negative test results, collected more than 24 hours apart," the agency said.

After the patient was released, a lab test was determined to be “weakly positive.” The patient was brought back into isolation “out of an abundance of caution," the CDC said.

While the woman was at the mall between 5:30 and 7:30 p.m. Saturday, she visited stores including Dillard’s, Talbots and Swarovski, officials said. She spent most of the time in the food court, where she ordered food from a Chinese restaurant and sat by herself to eat.

Authorities said she was not in close contact with anyone at the mall.

The woman returned to her hotel room at 7:35 p.m., and at 2 a.m. Sunday, she was transported back to the Texas Center for Infectious Disease in a specialized ambulance. All medical staff on board wore personal protective equipment, officials said.

Kurian said the risk of exposure at the mall was deemed to be low.

“I can say pretty much everybody has deemed to be low risk except for a few selected health-care personnel who were in direct contact with her at the time of her release,” Kurian said.

She said 16 of the 18 health-care personnel identified as having a possible exposure to the patient were classified as “low risk.” Two were medium risk.

Health authorities recommended a deep-cleaning of the mall and of the hotel where the woman had stayed.

The mayor and Bexar County Judge Nelson Wolff, along with San Antonio health officials, called Monday morning for people who are being monitored at Joint Base San Antonio-Lackland to undergo a third test to ensure they get a negative result before they’re released from quarantine.

The people were set to be released Monday, but Nirenberg said local health authorities are working with state and federal authorities to ensure they are not released “until we have that assurance."

Monday afternoon, Nirenberg declared a public health emergency in the city, saying that it’s necessary to keep people quarantined at the military base to prevent the possible spread of the virus. The declaration says no one quarantined at Lackland will be allowed to enter the city of San Antonio until further notice.