Coronavirus live news: Pfizer jab efficacy drops to 84% over six months; France to bring in health pass on 9 August

Efficacy of Pfizer/BioNTech vaccine falls from 96%; French health pass to be compulsory for cafe visits and some travel

• Belated Covid support welcomed by welfare recipients in Sydney
• Myanmar could become Covid super-spreader', says UN envoy
• Biden to announce vaccine requirement for US federal workers - report
• UK poised to end amber list quarantine for vaccinated US and EU arrivals
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11.20pm BST

An interesting story from Cuba - five mostly elderly and retired Cuban military generals have died in recent days in mysterious circumstances. Cuba's government has not given an explanation for the deaths but it is thought Covid may be to blame, as the rate has risen almost eight-fold since the start of July.

Related: Five Cuban generals dead in recent days - is the Covid spike to blame?

11.11pm BST

US Secretary of State Antony Blinken met the head of the World Health Organization, Tedros Adhanom Ghebreyesus, in Kuwait on Wednesday where he pledged his support to the UN agency's investigation in China into the origins of the coronavirus pandemic, according to Agence France-Presse.

The U.S. supports the @WHO plans for additional studies into Covid-19 origins, including in (the People's Republic of China), to better understand this pandemic and prevent future ones," Blinken tweeted after arriving in the Gulf Arab state.