World leaders came together virtually to mark the 75th anniversary of the United Nations, as the deadly coronavirus pandemic and tensions between the United States and China challenge the effectiveness and solidarity of the 193-member body.

One in seven cases of Covid-19 reported to the World Health Organization is a health worker and in some countries that figure rises to one in three, according to the WHO.

As the United States has begun to formally withdraw from the World Health Organization (WHO), opponents of the plan are urging Congress to block the move, citing concerns that the move will weaken global health security.

The United States will end its relationship with the World Health Organization over the body’s handling of the coronavirus pandemic, U.S. President Donald Trump said, accusing the U.N. agency of becoming a puppet of China.

United Nations leaders called for a global effort to develop and distribute to all at affordable prices vaccines, treatments and testing kits against COVID-19.

Despite infecting more than 3 million people around the world, there are 34 countries and territories that have not reported a single case of the novel coronavirus.

The World Health Organization said on Saturday that there was currently “no evidence” that people who have recovered from COVID-19 and have antibodies are protected from a second coronavirus infection.

A rubbery sea creature with a habit of clinging to ships and invading beaches could help measure plastic pollution, as sea squirts can filter tiny particles from the ocean and store them in their soft tissue.

More than 130,000 people were newly diagnosed with HIV last year in Eastern Europe – the highest rate ever for the region – while the number of new cases in Western Europe declined, global public health experts said.

Chicago-based AbbVie announced new data for Mavyret (glecaprevir/pibrentasvir), a pan-genotypic treatment for chronic HCV in treatment-naive patients with compensated cirrhosis.