Protesters hold placards reads "Close the border, say no to China" during a protest at a mall in Hong Kong, Tuesday, Feb. 4, 2020. Hong Kong on Tuesday reported its first death from a new virus, a man who had traveled from the mainland city of Wuhan that has been the epicenter of the outbreak. (AP Photo/Vincent Yu)

Protesters hold placards reads "Close the border, say no to China" during a protest at a mall in Hong Kong, Tuesday, Feb. 4, 2020. Hong Kong on Tuesday reported its first death from a new virus, a man who had traveled from the mainland city of Wuhan that has been the epicenter of the outbreak. (AP Photo/Vincent Yu)

BEIJING (AP) — Hong Kong hospitals cut services as thousands of medical workers went on strike for a second day Tuesday to demand the border with mainland China be shut completely. The new virus caused its first death in the semi-autonomous territory, adding to growing fears it is spreading locally.

All but two of Hong Kong’s land and sea crossings with the mainland were closed at midnight after thousands of hospital workers went on strike Monday. Hong Kong health authorities reported two additional patients without any known travel to the virus epicenter, bringing the number of locally transmitted cases to four.

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The growing caseload “indicates significant risk of community transmission” and could portend a “large-scale” outbreak, said Chuang Shuk-kwan, head of the communicable disease branch at the Center for Health Protection.

More than 7,000 health workers joined the strike Tuesday, according to the Hospital Authority Employees’ Alliance, the strike organizer.

Hong Kong was hit hard by the 2002-2003 outbreak of SARS, or severe acute respiratory syndrome, a virus from the same family as the current outbreak. Trust in Chinese authorities has plummeted following months of anti-government protests in the Asian financial hub.

The territory’s beleaguered leader, Carrie Lam, criticized the strike and said the government was doing all it could to limit the flow of people across the border.

“Important services, critical operations have been affected,” including cancer treatment and care for newborns, Lam told reporters. “So I’m appealing to those who are taking part in this action: Let’s put the interests of the patients and the entire public health system above all other things.”

China reported 425 deaths and 20,438 confirmed cases, up sharply from the previous day. Outside mainland China, at least 180 cases have been confirmed, including two fatalities, the one in Hong Kong and another in the Philippines.

The patient who died in Hong Kong was a 39-year-old man who had traveled to Wuhan, the mainland city where the outbreak started. The Hospital Authority said Tuesday he had pre-existing health conditions but gave no details.

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Most deaths have been among the elderly and those with other health problems, authorities said. More than 80% were over 60 years old, and more than 75% had an underlying disease, Jiao Yahui, a National Health Commission official, told a news conference Tuesday.

Dr. David Heymann, who led the World Health Organization’s response to the SARS outbreak, said it’s too early to tell when the new virus will peak, but that it appears to still be on the increase.

He said the spike in China’s caseload in recent days is partly attributable to the fact that officials have expanded their search to include milder cases, not only people with pneumonia. He declined to predict whether the virus would ultimately cause a pandemic, or worldwide outbreak. WHO defines a pandemic as sustained transmission of a disease in at least two world regions.

Heymann said as the new virus starts to spread beyond China, scientists will gain a better understanding of it. “What we will see is the clearer natural history of the disease,” he said, as those exposed to the virus “are being traced and watched very closely,” he said.

Nevertheless, WHO director-general Tedros Adhanom Ghebreyesus urged countries to share more data on infections outside China, adding that detailed information has been provided in only 38% of cases.

In particular, he said, “some high-income countries are well behind in sharing this vital data with WHO. ... Without better data, it’s very hard for us to assess how the outbreak is evolving or what impact it could have and to ensure we’re providing the most appropriate recommendations.”

In Wuhan, patients were being transferred to a new 1,000-bed hospital that was built in just 10 days, its prefabricated wards equipped with state-of-the-art medical equipment and ventilation systems. A 1,500-bed hospital also specially built is due to open soon.

Elsewhere in the city, authorities were converting a gymnasium, exhibition hall and cultural center into hospitals with a total of 3,400 beds to treat patients with mild symptoms. Television video showed beds placed in tight rows in cavernous rooms without any barriers between them.

Authorities hope that will help relieve what is being described as an overwhelmed public health system in Wuhan and surrounding areas.

One man, Fang Bin, said he saw wards so crowded during a visit to the city’s No. 5 Hospital on Saturday that some patients were forced to sit on the ground.

“There are too many patients, it’s overcrowded,” Fang told The Associated Press. He said he was taken from his home and questioned by police after he posted a video of what he saw online.

Thailand confirmed six more cases Tuesday, raising its total to 25, the highest outside China. Two were motorcycle taxi drivers who had driven for Chinese tourists. Earlier a Thai taxi driver was also diagnosed with the virus. The cases are concerning because they suggest the virus can spread more easily between people.

WHO officials reported slower progress than expected in equipping laboratories across Africa to test for the new virus. No confirmed cases have been reported on the continent, but WHO health security adviser Dr. Ambrose Talisuna said the risk is “very, very high.”

China has struggled to maintain supplies of face masks, along with protective suits and other items, as it seeks to enforce temperature checks at homes, offices, shops and restaurants, require masks be worn in public and keep more than 50 million people from leaving home in Wuhan and neighboring cities.

The European Union office in Beijing said member states have shipped 12 tons of protective equipment to China, with more on the way.

Japanese health officials, meanwhile, were conducting medical checks on some 3,700 passengers and crew on board a cruise ship docked off the coast of Yokohama after a passenger tested positive after leaving the vessel while it was in Hong Kong. At least 133 people who have symptoms or had close contact with the infected man have been identified and any confirmed to have the virus will be sent to hospitals for isolation treatment, health ministry officials said

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Associated Press writers Alice Fung in Hong Kong, Mari Yamaguchi in Tokyo and Maria Cheng in London contributed to this report.