to her population. The committee responsible for the recommendation acknowledges ignorance, but says the benefits outweigh the risks and that the timing of the rise of the omicron variant calls for action without delay. The recommendation is supported by Prime Minister Naftali Bennett.
The country has has been one of the best sources of studies of the pandemic, involving millions of patients in its public health system, on the efficacy and adverse effects of the mRNA vaccine and on natural immunity. But the decision worries precisely because there was not enough time to investigate whether the fourth dose is a good idea.
Both the immunity obtained from previous infection and the immunity acquired with the vaccine lose strength with time. In the case of people over 23 years, for example, the rate of delta-variant infection doubles after four or five months since the third dose, according to an Israeli Ministry of Health document obtained by the New York Times.