The acceleration should allow J&J to take part in the massive clinical trials program planned by the US government, which aims to have an effective vaccine by year end.
German newspaper Handelsblatt reported health ministers from Germany, France, Italy and the Netherlands wrote to the EU Commission that access to vaccines is "one of the most urgent issues that the European Union has to address at present".
Trump expressed his hope that a vaccine would be in place before the end of the year and said his administration would mobilise its forces to get a vaccine distributed once one was developed.
From the US to China, scientists are racing to develop a drug that can fight the deadly pandemic.
The trial will be conducted on 200 healthy people in the first stage. Meanwhile, the world's largest vaccine maker says it's unlikely Covid-19 vaccines can be mass-produced before second half of 2021.
The increasing death toll of under 50 age groups has left experts puzzled about the changing traits of the virus.
Countries across the world continue to ramp up efforts to fight Covid-19, which has infected more than 1.1 million people and killed around 60,450, a majority of them in Europe. Here are the latest updates for April 4:
Professor of Internal Medicine Cemil Tascioglu, also known as "the teacher of teachers" passed away on Wednesday from the coronavirus, marking the first pandemic-induced death among Turkish health professionals.
Currently, there are no approved medicines or preventive vaccines targeting the novel coronavirus, with most patients receiving only supportive care, such as help with their breathing.
The trial comes after US health officials said last week they had started a trial to evaluate a possible vaccine in Seattle.
Research shows for the first time how measles – one of the world's most contagious diseases – erases the body's memory of previous pathogens, effectively wiping its immunity memory.
A third of French citizens think immunisation is unsafe, according to figures. Globally, 79 percent of people agreed that vaccines are safe and 84 percent said they were effective.
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