Even though more and more vaccines against the coronavirus are being administered all over the world, many countries are still battling with outbreaks and face difficulties providing help to those in need.

One of those countries is Brazil. Here, they are facing a massive second wave outbreak, many daily deaths and instances of the health care systems collapsing.

When combined with drugs currently used to treat hepatitis C, the antiviral remdesivir is 10 times more effective in treating cells infected with SARS-CoV-2, the virus that causes COVID-19.

Published this week in Cell Reports, this finding - from Gaetano Montelione, a professor of chemistry and chemical biology at Rensselaer Polytechnic Institute, and his collaborators at the Icahn School of Medicine at Mount Sinai and the University of Texas at Austin - raises the potential for repurposing available drugs as COVID-19 antivirals in cases where a vaccine isn't practical or effective.

Just one third of people in the UK managed to access the hospital care they needed at the peak of the first wave of the Covid-19 pandemic - according to new research from the University of East Anglia.

A new study published today looks at the extent to which people managed to access NHS healthcare in April 2020, and as lockdown restrictions eased.

The human immune defense is based on the ability of white blood cells to accurately identify disease-causing pathogens and to initiate a defense reaction against them. The immune defense is able to recall the pathogens it has encountered previously, on which, for example, the effectiveness of vaccines is based.

Several weeks following the publication of the large real-world COVID-19 vaccine effectiveness study by the Clalit Research Institute in Collaboration with Harvard University in the New England Journal of Medicine (NEJM), additional results focusing on vaccine effectiveness in specific sub-populations have now been published.

The largest study of its type in the UK has identified differences in the immune response to COVID-19, between people with no symptoms, compared to those suffering a more serious reaction to the virus.

Researchers from the Wellcome Sanger Institute, Newcastle University, University College London, University of Cambridge, EMBL's European Bioinformatics Institute (EMBL-EBI) and their collaborators within the Human Cell Atlas initiative, found raised levels of specific immune cells in asymptomatic people.

COVID-19 patients who are overweight or obese are more likely to develop a more severe infection than patients of healthy weight, and they require oxygen and invasive mechanical ventilation more often. There is no increased risk of death . These conclusions, for which more than 7,000 patients were studied, appear from international research in eleven countries, including the Netherlands (Radboud university medical center).