Prime Minister Boris Johnson has announced that the UK will donate more than 100 million doses of Covid vaccine to poorer countries in the next year.
Dengue fever cases have been cut by 77% in a "groundbreaking" trial that manipulates the mosquitoes that spread it, say scientists.
Indian Prime Minister Narendra Modi has said that all adults in India will now get free vaccines.
All adults aged 25 to 29 in England who have not yet had a Covid vaccine will be able to book their first dose from Tuesday.
The first new treatment for Alzheimer's disease for nearly 20 years has been approved by regulators in the United States, paving the way for its use in the UK.
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There are fresh calls for the UK to show "historic leadership" and start sharing its vaccine doses with the world right now.
The UK regulator has approved the use of the Pfizer-BioNTech vaccine in children aged 12-15, saying it is safe and effective in this age group and the benefits outweigh any risks.
The Australian state of Victoria will extend its lockdown by another week as authorities battle to control a growing virus outbreak.
The EU's medicines agency (EMA) has approved the Pfizer-BioNTech vaccine for 12-15 year olds - the first jab allowed for this age group in the bloc.
The World Health Organization (WHO) has announced a new naming system for variants of Covid-19.
