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While China is racing the United States and other countries to develop a vaccine, its rivals are moving more cautiously. American companies have pledged to thoroughly vet a vaccine before wide use, despite pressure from President Trump to go faster. In Russia, the first country to approve a vaccine even before trials were completed, the authorities have yet to administer it to a large population, according to health officials and experts.

It is not clear how many people in China have received coronavirus vaccines. Sinopharm, a Chinese state-owned company with a vaccine candidate in late-stage trials, has said hundreds of thousands of people have received its shots. Sinovac, a Beijing-based company, said more than 10,000 people in Beijing had been injected with its vaccine. Separately, it said nearly all its employees — around 3,000 in total — and their families had taken it.

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Hong Kong-based Phoenix Television said this month that its Chinese journalists had been given the Sinopharm vaccine.

Tao Lina, a vaccine expert in Shanghai, said part of the government’s motivation was to “test” the public’s willingness to take a vaccine, laying the groundwork for wider acceptance.

“I think this is our country feeling us out,” said Mr. Tao, a former immunologist at the Shanghai Center for Disease Control and Prevention. “That is to say, even without an epidemic, everyone should consider the possibility of a resurgence and weigh whether they want to get a shot or not.”

Credit...Wang Zhao/Agence France-Presse — Getty Images

On Friday, Zheng Zhongwei, an official with China’s National Health Commission, said the government had “gained the understanding and support” of the World Health Organization after China’s cabinet approved the emergency use program. A spokesperson for the W.H.O. said on Saturday that China had issued a “domestic emergency use authorization,” which are issued at the discretion of countries and are not subject to W.H.O. approval.

The vaccine candidates in Phase 3 trials have been previously tested on smaller groups of people. Phase 3 involves administering a candidate and a placebo to hundreds more, to see whether they are safe to take and effective in stopping the coronavirus. Roughly 100,000 people are involved in those trials, based on Chinese company disclosures. Virtually all of them are in other countries, however, because the coronavirus has been largely tamed in China.

Still, the Chinese government had already approved three vaccines for emergency use on others at home. In July, it said it would prioritize medical workers, epidemic prevention personnel, border inspection officials and people who “ensure basic city operations” to receive vaccines.

Now, it appears that those groups could be expanding.

This month, the government of Shaoyang, a city in Zhejiang Province, asked local officials to identify more people who could qualify as “emergency users.” People in schools, kindergartens and nursing homes were recommended for inclusion, as well as travelers heading to “medium- to high-risk areas.”

Other government notices have asked local officials to identify people as candidates for getting vaccinations, though it was not always clear whether they would be inoculated before or after vaccines had cleared Phase 3 trials.

Tough containment efforts appear to have tamed the virus in most parts of China. Still, outbreaks in Beijing and the far west in recent months have spooked the country’s leaders, who worry that lockdowns could disrupt the economic recovery. Chinese public health experts are also concerned that the arrival of winter and the need to keep people indoors might usher in another outbreak.

A senior Chinese official said this month that a vaccine could be made available to the public as early as November. That same day, a spokeswoman for the United Arab Emirates’ Foreign Ministry said on Twitter that the government had authorized the Sinopharm vaccine to be given to its frontline workers after successful Phase 3 trials in the Emirates.

Credit...Tingshu Wang/Reuters

Raina MacIntyre, who heads the biosecurity program at the Kirby Institute of the University of New South Wales in Sydney, Australia, said she would not recommend the emergency use of vaccines before the conclusion of Phase 3 trials. AstraZeneca, the British-Swedish company, halted late-stage testing in the United States on a vaccine candidate this month after one volunteer fell seriously ill for unknown reasons.

Flawed vaccines can cause significant health problems. In 2017, children who were injected with Sanofi’s dengue vaccine became sicker. Children vaccinated against respiratory syncytial virus, or R.S.V., in the 1960s also suffered side effects, resulting in trials being scrapped.

Broad inoculation campaigns also increase the risk of getting multiple vaccines, which could have adverse effects on a person’s immune response.

“It may be three to six months before we get Phase 3 trial results — it’s not that long to wait,” Dr. MacIntyre said. “You are potentially muddying the waters for the time when we do have Phase 3 trial data for the best possible vaccine.”

Still, China may not want to wait.

In an interview with China Central Television, the state broadcaster, Mr. Zheng, the health official, said that when cold weather arrived, the government might consider expanding the scope of who qualified for emergency use, adding people who work in markets, transportation and the service industry.

“The goal is to first establish an immune barrier among special populations, so that the operations of the entire cities will have a stable guarantee,” Mr. Zheng said.

The vaccine makers and local governments stress that participation is voluntary, and many people who take the vaccines pay a considerable amount to do so. According to government notices, the vaccines would cost about $148, putting them out of reach for many in a country where 600 million people make that much in a month.

It is not clear whether recipients have been fully warned about the risks of taking an unapproved vaccine.

Dr. Mulholland, of the Murdoch institute, said he would give an experimental coronavirus vaccine only to health care workers, especially in places like Brazil, which has one of the world’s highest case counts, and continue monitoring them. “They can be educated on the potential risks,” he said.

Credit...Nicolas Asfouri/Agence France-Presse — Getty Images

Jerome Kim, head of the International Vaccine Institute, said he would like to know whether the Chinese authorities were following up on the vaccine recipients. He worries that people might engage in risky behavior if they believe they are protected by a vaccine of unknown efficacy.

“That has all sorts of negative consequences,” Dr. Kim said. “They could be infected and not know it, or they could be spreading the infection because they are relatively asymptomatic if the vaccine partially works.”

That possibility seems not to have fazed many in China.

On a recent Tuesday, Chen Deming, a former commerce minister, boasted to a trade and investment forum in Beijing that he did not need to wear a mask because he had taken a vaccine in Phase 3 trials. “Everybody, please relax,” he said, drawing laughter and applause from the audience.

Later, in an interview on the sidelines of the event, Mr. Chen, who turns 71 this year, said that his vaccine was developed by Sinopharm and that he had developed antibodies to protect against the coronavirus. He said a third of the Commerce Ministry’s staff had joined him in applying to receive the inoculation.

“Because I go abroad sometimes, I applied to take it,” Mr. Chen told a New York Times reporter. Later, he added: “Do you want a shot, too?”

Keith Bradsher contributed reporting. Amber Wang, Claire Fu and Liu Yi contributed research.

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