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Japan survey finds vaccine immunity level wanes over time in fully vaccinated people especially the elderly

By on October 18, 2021

Photo: Kateryna Kon/Science Photo Library

A survey by Soma city in Fukushima reveals the amount of neutralizing antibodies that can intercept viruses before they can infiltrate cells significantly wanes 90 days after receiving the second dose of a novel coronavirus vaccine. The sharp decline was evident in older people.

The said survey covered 500 fully vaccinated residents against COVID-19 and the results were based on blood tests taken of residents aged between 12 and 89.

In May, Hidekiyo Tachiya, the mayor of Soma city, doctor and chairman of the Japan Association of City Mayors, established the Soma City New Coronavirus Vaccine Medical Center. It brought together public health experts to verify the effectiveness and safety of COVID-19 vaccines that will aid in policy proposals to the Japanese government.

The survey’s focus was on the levels of neutralizing activity, or ability to prevent infections, to examine the effectiveness of COVID-19 vaccines.

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