In March, almost 80% of the French had a complete vaccination schedule and almost 60% had received the Ex : ils sont utilisé en deux ou quatre exemplaires sur certains lanceurs Ariane.” data-url=”https://news.google.com/sciences/definitions/univers-booster-3598/” data-more=”Lire la définition”>. However, the virus is spreading and the number of have been increasing in recent days. In particular, the effective R is greater than 1, which means that the virus is actively circulating.
Is he which is currently the majority, in France and in the world. It is more transmissible than its predecessors. the are less effective against the variant only against the original strain of the virus, which led the government to carry out the campaign to remember the . However, it is less dangerous. While the number of new daily cases was approaching half a million at the end of January 2022, the number of hospitalizations thankfully did not skyrocket.
However, between the people who have already had the virus and those who are vaccinated, how is it possible that there are still more than 80,000 new per day ? According to a study recently published in could it be that the immunity conferred by the Omicron variant of it provides only low-quality protection. In other words, it would be possible to be .
A study in vaccinated subjects
The authors of this study were interested in the rates ofStructure d’un anticorps
Un anticorps est un complexe protéique. Si chaque organisme doté d’un système immunitaire code pour des milliards d’anticorps différents, ils possèdent tous les mêmes caractéristiques globales. Ce sont…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/a/5/4/a543c37e56_50034150_anticorps-yohan-gfld.jpg” data-url=”https://news.google.com/sante/definitions/medecine-anticorps-93/” data-more=”Lire la suite”> neutralizing agents against the Delta variant, against the Omicron variant and against the original strain of in fully vaccinated individuals, some of whom also received the booster dose. They analyzed 259 samples from 128 patients.
, observed that the levels of neutralizing antibodies decrease over time in vaccinated individuals. Furthermore, the more clinically severe the infection, the higher the level of neutralizing antibodies.
Differences between Omicron and Delta infection
Infection with the Omicron variant of SARS-CoV-2 generates much lower levels of antibodies than those generated by contamination with the Delta variant. This can be explained in part by the fact that infection with the Delta variant triggers more discreet clinical pictures.
In conclusion, an infection with the Omicron variant generates much lower subsequent protection than an infection with the Delta variant. This means that a person infected with Omicron would be rather poorly protected, on the one hand, against reinfection with Omicron and, on the other hand, against infection with another variant.
To counteract the appearance of a new variant potentially more and more dangerous, it is necessary to limit the circulation of the virus. Because the more the virus circulates, the more opportunities it has to carry out a mutation.