NewsWorldCovid-19: fighting the pandemic with booster doses is not...

Covid-19: fighting the pandemic with booster doses is not a viable strategy, says WHO – franceinfo

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The UN agency believes that it is now necessary to develop vaccines having an impact on the transmission and prevention of infection.

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The criticism is scathing. “A vaccination strategy based on repeated boosters” the first vaccines “unlikely to be appropriate or viable” vs the pandemic of Covid-19, warnt, Tuesday, January 11, a group of experts from the World Health Organization (WHO) responsible for overseeing vaccines against Sars-CoV-2.

In addition, these specialists consider “that vaccines against Covid-19 with a high impact in terms of transmission and prevention of infection, in addition to preventing severe forms of disease and death, are necessary and must be developed”. “While waiting for such vaccines to become available, and as the Sars-CoV-2 virus evolves, it may be necessary to update the composition of current anti-Covid vaccines, in order to ensure that[ils] continue to provide the WHO recommended levels of protection against infection and disease “ caused by variants, including Omicron, say these experts.

A little more than six weeks after its identification in South Africa, data from several countries converge on two points: Omicron – which falls under the WHO category of variants of concern – is transmitted much faster than the previously dominant variant, Delta, and appears to cause less severe forms of the disease overall.

Important point: it is not known whether this apparently lower severity comes from the intrinsic characteristics of the variant, or if it is linked to the fact that it affects populations already partially immune, by the vaccine or a previous infection. Still, Omicron is progressing dramatically in many countries and cases are doubling every two or three days, unheard of with previous variants. Mutations in Omicron appear to allow it to reduce antibody immunity. Consequence: it can probably contaminate a large number of vaccinees, and re-infect people previously infected with the virus.

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