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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.

If everything goes as Russia’s expectation, it will be world’s first country to approve a coronavirus vaccine for widespread in the second week of August despite safety and efficacy concerns, according to a report. The adenoviral vector-based vaccine developed by Russian military and government researchers is currently in phase 2 trials.

According to a report from CNN, Russian officials are hoping to get approval for the COVID-19 vaccine developed by the Moscow-based Gamaleya Institute on Agust 10 or even before that. The officials told the outlet that the vaccine will be approved for public use with frontline healthcare workers receiving it first.

“It’s a Sputnik moment,” said Kirill Dmitriev, head of Russia’s sovereign wealth fund, which is financing Russian vaccine research, referring to the successful 1957 launch of the world’s first satellite by the Soviet Union, according to CNN.

“Americans were surprised when they heard Sputnik’s beeping. It’s the same with this vaccine. Russia will have got there first,” he was quoted as saying.

However, Russia is yet to release the scientific data on its coronavirus vaccine trials, hence, questions remain about the safety and efficacy of the vaccine, said the report. The vaccine is in the second phase of testing with developers planning to launch the phase 3 trials sometime after August 3.

Earlier, Interfax reported, citing Health Minister Mikhail Murashko, that the vaccine will be widely used in parallel with phase 3 trials. He said the country plans to vaccinate medics who are at high-risk for COVID-19 next month before clinical trials are completed.

Murashko added that individuals at higher risk of getting infected with the coronavirus such as older people or those with health conditions will also be prioritised for the vaccine, although he did not estimate or reveal when that would happen. The minister added 800 people will be recruited for the phase 3 trials.

Meanwhile, health officials were more cautious considering the fact that human testing of the vaccine is incomplete, and the state registration is expected to begin after August 3, reported The Moscow Times.

On Monday, Moderna and Pfizer announced the commencement of the final phase 3 trials of their candidate vaccines against the SARS-CoV-2 virus, which has so far claimed at least 654,477 lives and infected 16,514,500 people worldwide. 

Researchers will recruit up to 30,000 volunteers in separate trials both backed by the US government. India's first indigenous coronavirus vaccine, COVAXIN, is undergoing phase 1 human clinical trials across the country. More than 150 COVID-19 vaccines are being developed all over the world with at least six candidates already in late-stage clinical trials.