However, against the Omicron of Covid-19, which currently dominates in Switzerland, the protective effect against infection appears to be reduced. In contrast, the mRNA vaccines still offer a high level of protection against a severe course of disease. This is true for all currently circulating variants of Covid-19, including Omicron. Accordingly, in recent months, vaccinated persons have had to be hospitalized significantly less often because of a Covid-19 infection than unvaccinated or incompletely vaccinated persons ( to the current data of the Federal Office for Public Health).
Protection from vaccination tends to decline over time. Especially in older persons. A booster vaccination helps to increase the effectiveness again. How long the protection of the booster vaccination lasts is currently unclear and is being continuously investigated.