Studies by Nagasaki University and others have shown that the effect of preventing the onset of the new coronavirus by the third vaccination was 68.7% when the Omicron strain spread.
The research group says that after two doses, the effect will decrease over time, but will increase with the third dose.
Data from 2000 men and women between the ages of 16 and 64 who were suspected of having corona and were tested at 13 medical institutions in 10 prefectures from January to February due to the spread of Omicron strains in groups such as Nagasaki University. Based on the above, we analyzed the effect of the vaccine on preventing the onset and showed the results at the expert meeting of the Ministry of Health, Labor and Welfare held on the 30th.
According to it, there are 758 people who tested positive and 1242 people who were negative, and analysis based on the vaccination history shows that those who have been vaccinated twice with Pfizer or Moderna have the effect of preventing the onset. It was 42.8%, while it was 68.7% for those who received the third vaccination.
The effect of preventing the onset was 88.7% with two inoculations from July to September last year, but after that, it decreased due to the replacement with the Omicron strain and the time after inoculation, and the research group said that it was the third inoculation. It is said that the effectiveness will increase.
Takaji Wakita, chairman of the expert meeting, said, "It can be said that the effectiveness is close to 70% and it can be said that it will recover to a certain extent by the third inoculation. From overseas data, it is expected to be even more effective in preventing hospitalization and aggravation." I'm talking.