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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.

Tokyo, Jul 27: Gold hit an all-time high on Monday as tit-for-tat consulate closures in China and the United States rattled investors, boosting the allure of safe-haven assets, although sentiment was mixed with tech gains supporting some Asian stocks.

MSCI's ex-Japan Asia-Pacific index rose 1.3 percent as Taiwan's TSMC, Asia's third-largest company by market capitalisation, rose almost 10 percent.

The chipmaker's gains boosted other tech stocks in the region and came after rival Intel signalled it may give up manufacturing its own components due to delays in new 7-nanometer chip technology.

Also soothing sentiment, Chinese shares eked out gains after big falls late last week, with CSI300 index rising 0.5 percent.

S&P500 futures were last up 0.4 percent in choppy trade while Japan's Nikkei fell 0.5 percent, resuming trade after a long weekend and catching up with falls in global shares late last week.

Global shares had lost steam last week after Washington ordered China's consulate in Houston to close, prompting Beijing to react in kind by closing the US consulate in Chengdu.

US Secretary of State Mike Pompeo took fresh aim at China last week, saying Washington and its allies must use "more creative and assertive ways" to press the Chinese Communist Party to change its ways.

"US President (Donald) Trump used to say China's President Xi Jinping is a great leader. But now Pompeo's wording is becoming so aggressive that markets are starting to worry about further escalation," said Norihiro Fujito, chief investment strategist at Mitsubishi Securities.

Gold rose 1.0 percent to a record high of $1,920.9 per ounce, surpassing a peak touched in September 2011, as Sino-US tensions boosted the allure of safe-haven assets, especially those not tied to any specific country.

The yellow metal is also helped by aggressive monetary easing adopted by many central banks around the world since the pandemic plunged the global economy into a recession.

Some investors fret such an unprecedented level of money-printing could eventually lead to inflation.

MORE STIMULUS

Hopes of a quick US economic recovery are fading as coronavirus infections showed few signs of slowing.

That means the economy could capitulate without fresh support from the government, with some of earlier steps such as enhanced jobless benefits due to expire this month.

Investors hope US Congress will agree on a deal before its summer recess but there are some sticking points including the size of the stimulus and enhanced unemployment benefits.

US Treasury Secretary Steve Mnuchin said the package will contain extended unemployment benefits with 70 percent "wage replacement".

Democrats, who control the House of Representatives, want enhanced benefits of $600 per week to be extended and look to much bigger stimulus compared with the Republicans' $1 trillion plan.

Investors are looking to corporate earnings from around the world for hints on the pace of recovery in the global economy.

"It looks like rising coronavirus cases are starting to slow down recovery in many countries," said Masahiro Ichikawa, senior strategist at Sumitomo Mitsui DS Asset Management.

Concerns about the US economic outlook started to weigh on the dollar, reversing its inverse correlation with the economic well-being over the past few months.

The dollar index dropped 0.3 percent to its lowest level in nearly two years.

The euro gained 0.3 percent to $1.1693, hitting a 22-month high of $1.16590 as sentiment on the common currency improved after European leaders reached a deal on a recovery fund in a major step towards more fiscal co-operation.

Against the yen, the dollar slipped 0.5 percent to 105.605 yen, a four-month low while the British pound hit a 4 1/2-month high of $1.2832.

Oil prices dipped on worries about the worsening Sino-US relations.

Brent futures fell 0.46 percent to $43.14 per barrel while US crude futures lost 0.44 percent to $41.11.