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Ninety per cent of a sample group of coronavirus-recovered patients from a prominent hospital in China's Wuhan city where the pandemic broke out have reported lung damage and five per cent of them are again in quarantine after testing positive for the virus, according to a media report on Wednesday.

A team at the Zhongnan Hospital of Wuhan University led by Peng Zhiyong, director of the hospital's Intensive Care Unit, has been conducting follow-up visits with '100 recovered patients' since April.

The first phase of this one-year programme finished in July. The average age of the patients in the study is 59.

According to the first phase results, 90 per cent of the patients' lungs are still in a damaged state, which means their lungs ventilation and gas exchange functions have not recovered to the level of healthy people, state-run Global Times reported.

Peng's team conducted a six-minute walking test with the patients. They found that the recovered patients could only walk 400 metres in six minutes while their healthy peers could walk 500 metres in the same period.

Some recovered patients have to rely on oxygen machines even three months after being discharged from the hospital, Liang Tengxiao, a doctor from the Dongzhimen Hospital, Beijing University of Chinese Medicine, was quoted as saying by the report.

Liang's team is also conducting follow-up visits with recovered patients aged above 65.

The results also showed that antibodies against the novel coronavirus in 10 per cent of the 100 patients have disappeared.

Five per cent of them received negative results in Covid-19 nucleic acid tests but positive results in Immunoglobulin M (IgM) tests, and thus have to be quarantined again, the report said.

IgM is usually the first antibody produced by the immune system when a virus attacks. A positive result in an IgM test usually means that a person has just been infected by the virus.

It is still unclear if this means these people have been infected again.

The 100 patients' immune systems have not fully recovered as they showed a low level of B cells -- - a primary force for killing viruses in the human body -- but a high level of T cells which only recognise viral antigens outside infected cells.

"The results revealed that the patients’ immune systems are still recovering," Peng said.

The patients also suffered from depression and a sense of stigma. Most of the recovered patients told the team that their families were not willing to have dinner with them at the same table, the report said.

Less than half of the recovered patients have returned to work, it said.

The findings are significant as the coronavirus first emerged in Wuhan city.

Hubei province for which Wuhan is the provincial capital has reported a total of 68,138 confirmed Covid-19 cases till now. The disease has claimed 4,512 lives in the province, according to the official data.

China reported 27 new confirmed Covid-19 cases on Tuesday, including 22 locally-transmitted cases, the National Health Commission (NHC) said on Wednesday.

Washington, Aug 4: US President Donald Trump gave popular Chinese-owned video app TikTok six weeks to sell its US operations to an American company, saying Monday it would be "out of business" otherwise, and that the government wanted a financial benefit from the deal.

"It's got to be an American company... it's got to be owned here," Trump said. "We don't want to have any problem with security."

Trump said that Microsoft was in talks to buy TikTok, which has as many as one billion worldwide users who make quirky 60-second videos with its smartphone app.

But US officials say the app constitutes a national security risk because it could share millions of Americans' personal data with Chinese intelligence.

Trump gave the company's Chinese parent ByteDance until mid-September to strike a deal.

"I set a date of around September 15, at which point it's going to be out of business in the United States," he said.

Whatever the price is, he said, "the United States should get a very large percentage of that price because we're making it possible."

Trump compared the demand for a piece of the pie to a landlord demanding under-the-table "key money" from a new tenant, a practice widely illegal including in New York, where the billionaire president built his real estate empire.

"TikTok is a big success, but a big portion of it is in the country," he said. "I think it's very fair."

But Trump also threw a surprise new condition in any deal, saying the sale of TikTok's US business would have to result in a significant payout to the US Treasury for initiating it.

"A very substantial portion of that price is going to have to come into the Treasury of the United States, because we're making it possible for this deal to happen," Trump told reporters.

"They don't have any rights unless we give it to them," he said.

Sell or shut down

The pressure for a sale of TikTok's US and international business, based in Los Angeles, left the company and ByteDance facing tough decisions.

Trump has made TikTok the latest front in the ongoing political and trade battles between Washington and Beijing.

The app has been under formal investigation on US national security grounds because it collects large amounts of personal data on all its users and is legally bound to share that with authorities in Beijing if they demand it.

Both its huge user base and its algorithm for collecting data make it hugely valuable.

But being forced by the US government to sell at least its US business or be shut down -- and to then split the sale price with the US Treasury as Trump is demanding -- was an almost unheard-of tactic.

Shutting down could force users to switch to competitors, and many content creators are already encouraging followers to follow them on other social media platforms.

"The most obvious beneficiaries are Snapchat, Facebook and Twitter, with Snapchat likely being the biggest beneficiary," said investment analysts at Lightshed Partners.

Earlier Monday, ByteDance founder Zhang Yiming acknowledged the hefty pressure and said in a letter to staff, reported by Chinese media, that they were working around-the-clock "for the best outcome."

"We have always been committed to ensuring user data security, as well as the platform neutrality and transparency," Zhang said.

However, he said, the company faces "mounting complexities across the geopolitical landscape and significant external pressure."

He said the company must confront the challenge from the United States, though "without giving up exploring any possibilities."

According to Britain's The Sun newspaper Monday, as a possible consequence of the pressure, ByteDance is planning to relocate TikTok's global operations to Britain.

Pushing back

China's foreign ministry pushed back Monday, calling Washington hypocritical for demanding TikTok be sold.

"The US is using an abused concept of national security and, without providing any evidence, is making presumptions of guilt and issuing threats to relevant companies," said spokesman Wang Wenbin.

"This goes against the principle of market economy and exposes the hypocrisy and typical double standards of the US in upholding so-called fairness and freedom," he added.

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