A senior health official in South Korea who is responsible for leading efforts against the coronavirus outbreak admitted to being a member of a doomsday church "cult" after contracting the virus.

The delay forced authorities to quarantine another 50 health officials at a time when medical resources are already stretched thin.

A police officer and an elementary school teacher also revealed that they believe in the Shincheonji Church of Jesus after being diagnosed with coronavirus.

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A senior health official in Daegu — the city that lies at the center of South Korea's coronavirus outbreak — confessed to being a follower of a controversial doomsday church "cult" after testing positive for the virus.

The unnamed official leads the Infection Preventive Medicine Department in the city that is home to 681 of the 833 COVID-19 cases in the country, the South China Morning Post reported. Over 450 of those Daegu residents have been found to be members of the Temple of the Tabernacle of the Testimony, a fringe religious sect that belongs to the Shincheonji Church of Jesus widely viewed as a "cult" by mainstream Christian organizations.

Authorities worry that the toll in Daegu is likely to increase because the official, who is in charge of the local battle against the deadly illness, only came forward and admitted that he belonged to Shincheonji after he was already sick. This delay forced officials to quarantine 50 more health officials in their homes as a precaution, the Post said.

And he is not alone.

A Daegu police officer and a teacher at an elementary school near the city revealed themselves as believers after being diagnosed with coronavirus, according to the Post.

Shincheonji Church of Jesus was established in 1984 by Lee Man-hee and counts nearly 250,000 South Koreans among its ranks.

Korean officials say the 'cult' played a key role in spreading the virus

The Korea Centers for Disease Control and Prevention believes a 61-year-old woman, who tested positive for the coronavirus, triggered a "super-spreader" event at the same church. She was the country's 31st patient. Officials say she didn't get tested for COVID-19 since she mistook her symptoms for the common cold as she hadn't left South Korea recently and believed she couldn't have contracted the virus.

Officials ordered nearly 1,000 churchgoers who came in contact with the woman at prayer services to isolate themselves at home. Since then the city government also shut down the Temple's 163 facilities in Daegu and Seoul Mayor Park Won-soon criticized Shincheonji for "playing a key role" in spreading the illness, according to the Post.

Church leaders are working with authorities and have shared a list of 9,600 believers in Daegu. That entire group has been quarantined in their homes, irrespective of whether they're presenting COVID-19 symptoms. All its members across South Korea have been asked to stay home and the addresses of some 1,100 facilities have also been provided to officials, the Post said.

In this Feb. 14, 2020, photo, a woman wearing a face mask walks on a almost empty street at the Chinatown in Incheon, South Korea. Associated Press

For its part, the Temple issued a statement asking critics to stop hurling "hatred and groundless accusations at them," since its members, like others who have been sickened, were "victims of the disease which originated in China and was transmitted to this country."

But people say that the information provided by Shincheonji doesn't include its "bible study rooms" and "undercover churches," where people sit so closely packed together that they can rub shoulders with one another while praying.

South Korean President Moon Jae-in said the emergence of so many coronavirus cases centered on the church had led to a "completely new situation" in the nation's fight to control the spread of the disease, the Post reported.

South Korea didn't enforce strict travel restrictions in the early stages of the epidemic

Officials have faced backlash for not enforcing more stringent restrictions and only stopping travelers from Hubei province in China from entering South Korea. This could have enabled people who picked up the infection elsewhere to enter the country without any hassle.

"It is like claiming that the gatekeeping is being done well without knowing that your back door is still left open," Dr. Lee Hoanjong, a professor at Seoul National University Children's Hospital, told the Post.

"Medical staff and health infrastructure in Daegu are now being stretched to a breaking point. If we have another Daegu in this country, I can't imagine what would happen."

This article has been updated.