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The number of Americans who have died from Covid-19 has reached 600,012 - the most of any nation - according to data from Johns Hopkins University.
Leaders of the major industrial nations have pledged one billion Covid vaccine doses to poor countries as a "big step towards vaccinating the world", Boris Johnson has said.
Dengue fever cases have been cut by 77% in a "groundbreaking" trial that manipulates the mosquitoes that spread it, say scientists.
Novavax says late-stage data from its US-based clinical trial shows its vaccine is more than 90 per cent effective against COVID-19.
The virologist, Shi Zhengli, said in a rare interview that speculation about her lab in Wuhan was baseless. But China’s habitual secrecy makes her claims hard to validate.
US President Joe Biden's administration will provide 500 million doses of the Pfizer Covid-19 vaccine to about 100 countries over the next two years, US media report.
Glaring COVID-19 vaccine inequality has created a 'two-track pandemic' with Western countries protected and poorer nations still exposed.
Major Indian states that have been virus hotpots are easing restrictions as Covid case numbers continue to fall.
The amount of carbon dioxide in the air now is as much as it was about four million years ago, a time when the average temperature was 3C higher than it was before the Industrial Revolution, scientists say.
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