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  2. FDA and WHO disagree on COVID-19 vaccine booster variant advice

    The FDA has picked BA.4/5 to target for booster campaigns, while the WHO suggests chasing circulating variants is futile and BA.1 boosters could offer the broadest immunity against future variants

  3. Should you get the 2nd Covid-19 booster now, or wait for ...

    Dr Chee said research has shown that Omicron-specific vaccines or bivalent boosters have elicited strong antibody response against extremely contagious sub-variants. Bivalent booster is a vaccine ...

  4. Reinfection from new Omicron variants and rising hospital ...

    Australians are being urged to get Covid-19 booster shots due to rising cases and possible reinfection for those who've had the virus from new variants of Omicron.

  5. COVID-19’s BA.4 and BA.5 Omicron subvariants: 12 questions ...

    The quickly changing virus that causes COVID-19 has spawned two new Omicron subvariants, BA.4 and BA.5. These highly contagious offshoots of the original virus are responsible for 80% of the COVID-19 cases in the country today. MD Anderson Chief Infection Control Officer Roy Chemaly, M.D., tells us more about these new, and concerning, subvarients.

  6. As it happened: UK Covid cases up 32% - BBC News

    Omicron is actually a group of closely related variants and sub-variants that came from a common ancestor. The BA.4 and BA.5 sub-variants of Omicron that are spreading now can infect people even ...

  7. Tracking SARS-CoV-2 variants - World Health Organization

    All viruses, including SARS-CoV-2, the virus that causes COVID-19, change over time. Most changes have little to no impact on the virus’ properties. However, some changes may affect the virus’s properties, such as how easily it spreads, the associated disease severity, or the performance of vaccines, therapeutic medicines, diagnostic tools, or other public health and social measures.

  8. COVID-19 variants identified in the UK – latest updates

    Analysis shows that protection against symptomatic disease 2 to 4 weeks after a booster dose ranges from around 65% to 75%, dropping to 55% to 65% at 5 to 9 weeks – and 45% to 50% 10 weeks or ...

  9. BA.4/5 is sweeping the globe - by Katelyn Jetelina - Substack

    The newest Omicron variant, BA.4/5, is gaining traction, causing case, hospitalization, and death curves to trend upwards in many countries. This variant was first detected in South Africa in early 2022 and caught our attention because it had several mutations on the spike protein. Two mutations in particular, called L452R and F486V, caught our attention because we had seen them on previous ...

  10. Two new fast-spreading subvariants of Omicron are causing fresh surges of Covid around the world. BA.4 and BA.5 were first identified in South Africa and may soon become the dominant strains in ...

  11. Where China's Covid-19 vaccine development is going

    According to a study published in June by the science journal Nature, the protection rate against the omicron BA.1 sub-variant dropped to 46.6 per cent and against BA.2 to 51.7 per cent within ...