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Covid-19 vaccines made by Pfizer and Moderna that use mRNA technology provide the biggest boost to antibody levels when given 10-12 weeks after the second dose, a new study has found. The "COV-Boost" study was cited by UK officials when they announced that Pfizer and Moderna were preferred for use in the country's booster campaign, but the data has only been made publicly available now. The study found that six out of the seven boosters examined enhanced immunity after initial vaccination with Pfizer-BioNTech's vaccine, while all seven increased immunity when given after two doses of AstraZeneca's vaccine. "A third dose will be effective for many of the vaccines we've tested and in many different combinations," Professor Saul Faust, an immunologist at the University of Southampton and the trial's lead, told the media.

The government will on Thursday launch a drive to boost childhood vaccination rates, health authorities said, seeking an "urgent reversal" to a fall in uptake as the country faces a worsening measles outbreak. Routine childhood immunisations in Britain for diseases including measles, mumps and rubella, diphtheria and polio, have been falling gradually over the past decade, but dipped more sharply after the Covid-19 pandemic, mirroring a global decline. Last year UNICEF said people worldwide had lost confidence in the importance of routine childhood vaccines during the pandemic, with misinformation, dwindling trust in governments and political polarisation contributing to rising hesitancy. Britons will begin seeing adverts from next week across various media, including a television campaign featuring children reminding parents of the risk of missing out on vaccinations, the UK Health Security Agency (UKHSA) said. "We need an urgent reversal of the decline in the uptake of childhood vaccinations to protect our communities," UKHSA chief executive Jenny Harries said in a statement.