We ask our science correspondent Derrick Williams how long natural immunity lasts.
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How many people have been vaccinated? Which vaccines are approved? Here's the global progress on vaccination against SARS-CoV-2, the virus that causes COVID-19.
The good summer weather and strong vaccination numbers can obscure the dangers that the coronavirus still poses. Public health officials in Germany want to avoid a repeat of the false sense of security in summer 2020.
Berlin intends to roll out a digital immunity certificate by the end of June, making it easier to prove that a person has been fully vaccinated against the coronavirus. But critics warn the timeframe is too ambitious.
The delta variant is now present in more than 80 countries. More transmissible than the alpha variant, it is sparking concerns of further loss of lives and lockdowns.
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