Vaccines are effective in reducing household infection rates, survey shows


Receiving two vaccines against the novel coronavirus reduced the likelihood of secondary infections in households from 37% to 13%, a survey from Hiroshima Prefecture in western Japan showed.

“It is difficult to prevent infections among people living together,” said Takaji Wakita, director of the National Institute of Infectious Diseases. “Yet the investigation has shown that we can prevent infections to some extent by receiving two vaccines. “

The investigation focused on the families of 752 people who tested positive for COVID-19 in Hiroshima Prefecture in August. The prefecture analyzed 1,840 family members who live with the patients and were found to have been in close contact with them, investigating whether family members suffered from secondary infections and whether they had been vaccinated.

Out of 1,357 family members who had not been vaccinated, 511 people, or 37.7%, contracted the virus.

In contrast, out of 379 family members who had been twice inoculated, only 51 people, or 13.5%, tested positive for COVID-19. The infection rate was 27.9% among those who had been vaccinated once.

Hiroshima Prefecture also interviewed 2,006 COVID-19 patients whose infections were detected in the prefecture between June and August. Among unvaccinated patients aged 65 and older, 41.7% developed severe symptoms. The rate of severe illness was much lower, at 13.2% among people of the same age group who received two vaccines.

As for patients under 65, the rate of severe symptoms was also lower in those who had been vaccinated twice, at 2.2%, compared to 6.9% in those who had not been vaccinated.

In terms of patients with underlying illnesses, those who developed moderate to severe symptoms accounted for 7.2% of unvaccinated people and 1.6% of patients who had been vaccinated.

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