A leading scientist behind the University of Oxford's potential COVID-19 vaccine said on Wednesday the team has seen the right sort of immune response in trials but declined to give a firm timeframe for when it could be ready.

While some health officials say a coronavirus vaccine could be developed by the end of the year, others aren't so optimistic.

The Ad5-nCoV is one of China's eight vaccine candidates approved for human trials at home and abroad for the respiratory disease caused by the new coronavirus.

The amount that patients pay out of pocket depends on insurance, income and other factors.

British researchers testing an experimental vaccine against the new coronavirus aim to immunize more than 10,000 people to find out if it works.

The company's vaccine is at the forefront of the efforts in developing a treatment for the fast-spreading virus.

News of the major medical advance lifted world markets, outshining gloomy data showing the U.S. economy in the worst downturn since the Great Recession.

In recent weeks, vaccine opponents have made several unsubstantiated claims.

The federal government has committed tens of millions of dollars to help find or create a vaccine for the novel coronavirus that causes COVID-19.

The cash announced today is on top of $275 million in research funding the Liberals announced in March at the outset of the pandemic.