Covid-19 vaccines, waning immunity and booster shots: An expert weighs in

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Scientists are on opposite sides of the fence when it comes to human challenge trials.
Scientists are on opposite sides of the fence when it comes to human challenge trials.
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Israel was heralded as a world leader in Covid-19 vaccinations and was one of the first countries to show that inoculation was bending the curve of new infections. By 7 September 2021, more than 60% of its population had been fully vaccinated.

But data from December 2020 to July 2021, released by the country's Ministry of Health, showed a worrying increase in the numbers of vaccinated people who caught the virus that causes Covid-19 (known as "breakthrough infections"). This happened particularly in those who had been vaccinated early on in the country's inoculation programme. 

People worldwide soon saw this as a grim indication that the protection from the vaccines was waning after six months, meaning that they were losing their effectiveness over time. Some countries have already started discussions about implementing booster shots. In the US, people may be eligible to receive a third dose eight months after their second dose.

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