GoodTaste
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- Feb 19, 2016
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I can't clearly understand why "that that people have some immunity" is "a high risk"? Is it a high risk that would lead to false results?
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On the other hand, Feigl-Ding says, measuring vaccine effectiveness in Brazil may produce artificially low results because there is a high risk that people have some immunity because of previous contact with the virus. “This is a natural property of doing a trial in a highly previously infected population,” he says. This could also explain why the CoronaVac clinical trial in Brazil showed lower efficacy numbers (50%) than in other countries such as Turkey (83.5%) and Indonesia (65%).
Source: Science Chinese COVID-19 vaccine maintains protection in variant-plagued BrazilBy Sofia MoutinhoApr. 9, 2021
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On the other hand, Feigl-Ding says, measuring vaccine effectiveness in Brazil may produce artificially low results because there is a high risk that people have some immunity because of previous contact with the virus. “This is a natural property of doing a trial in a highly previously infected population,” he says. This could also explain why the CoronaVac clinical trial in Brazil showed lower efficacy numbers (50%) than in other countries such as Turkey (83.5%) and Indonesia (65%).
Source: Science Chinese COVID-19 vaccine maintains protection in variant-plagued BrazilBy Sofia MoutinhoApr. 9, 2021