COVD-19 vaccines might not work equally
People in some countries might get the short end of the stick when it comes to COVID-19 vaccines because of an inequality that lurks in the design of the vaccines themselves. Several leading vaccine candidates use mild viruses as delivery systems. But if people have been exposed to these mild viruses in the past, their immune systems might attack the delivery system itself. This could nullify the effect of the vaccine and, judging from the experience of a problematic HIV-vaccine candidate, even increase the risk of infection. Scientists are watching to see whether either of these outcomes will result from COVID-19 vaccines. But if they do, it’s more likely to happen to people in countries such as Thailand, Brazil or Cameroon, where exposure to these mild viruses is more common.
Wired | 8 min read
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