Experts from the World Health Organization (WHO) said on Tuesday that the mere repetition of booster vaccines will be insufficient to prevent the appearance of variants of the new coronavirus and urged to improve immunizers to stop the transmission of the disease.
“A vaccination strategy based on repeated booster doses” of the first vaccines “has little chance of being appropriate or feasible,” the WHO Technical Advisory Group (TAG) on the composition of vaccines against the new vaccine said in a statement. coronavirus.
“Vaccines against COVID-19 are needed and must be developed with a strong impact on prevention and transmission, in addition to the prevention of severe cases and deaths.”the group expressed.
“While waiting for these vaccines to become available, and as the SARS-CoV-2 virus evolves, it may be necessary to update the composition of current anticovid vaccines, to ensure that they continue to provide the levels of protection recommended by the WHO. against infection and disease “caused by the variants, the expert group considered.
About six weeks after the omicron variant was identified in South Africa, data from several countries agree on two points: omicron – which falls into the WHO category of worrisome variants – is transmitted much faster than the previously dominant delta variant – and, globally, it seems to carry less severe forms of the disease.
However, it is not known whether this apparently lower severity is due to the characteristics of the variant or to the fact that omicron is affecting partially immunized populations, either from the vaccine or from a previous infection.
In addition, omicron is advancing brilliantly in many countries and infections are doubling every two or three days, something that had not happened with the previous variants.
The omicron mutations seem to allow it to reduce the immunity by antibodies against the virus, so it can probably infect a significant number of vaccinated and reinfect people who have already overcome the disease.