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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.

Paris, Aug 5: French President Emmanuel Macron on Tuesday said France will deploy a civil security detachment and several tonnes of medical equipment to Lebanon, whose capital was hit by an explosion that left over 70 people dead and thousands injured.

"Emergency doctors will also reach Beirut as soon as possible to strengthen hospitals. France is already engaged," the French President said in a tweet.

US Secretary of State Mike Pompeo, also extended his deepest condolences to all those affected by the "massive explosion at the port of Beirut."

"We are closely monitoring and stand ready to assist the people of Lebanon as they recover from this tragedy. Our team in Beirut has reported to me the extensive damage to a city and a people that I hold dear, an additional challenge in a time of already deep crisis. 

We understand that the Government of Lebanon continues to investigate its cause and look forward to the outcome of those efforts," he said in a statement.

UK Prime Minister Boris Johnson said his country is ready to provide support in any way it can.

"The pictures and videos from Beirut tonight are shocking. All of my thoughts and prayers are with those caught up in this terrible incident. The UK is ready to provide support in any way we can, including to those British nationals affected," Johnson said.

Israeli people share the pain of their Lebanese neighbours after a devastating blast in the port of Beirut and reach out to offer their aid, Israeli President Reuven Rivlin said on Tuesday.

"We share the pain of the Lebanese people and sincerely reach out to offer our aid at this difficult time," Rivlin said on Twitter.

Over 70 people have been killed while thousands of others were wounded in the massive explosion on Tuesday in Beirut which shattered buildings and caused widespread damage.