{"id":266361,"date":"2020-08-25T02:34:19","date_gmt":"2020-08-25T06:34:19","guid":{"rendered":"https:\/\/canadianinquirer.net\/v1\/?p=266361"},"modified":"2020-08-25T02:34:19","modified_gmt":"2020-08-25T06:34:19","slug":"ethics-must-not-be-ignored-when-testing-covid-19-vaccines","status":"publish","type":"post","link":"https:\/\/canadianinquirer.net\/v1\/2020\/08\/25\/ethics-must-not-be-ignored-when-testing-covid-19-vaccines\/","title":{"rendered":"Ethics must not be ignored when testing COVID-19 vaccines"},"content":{"rendered":"
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Many find the idea of human challenge studies surprising. Why would scientists want to expose healthy volunteers to an infectious disease? One reason is to efficiently conduct a preliminary test of a new vaccine. (Pixabay photo)<\/figcaption><\/figure>\n

The grassroots organization 1Day Sooner has been asking people to indicate their willingness to volunteer for human challenge studies of COVID-19<\/a>. Challenge studies, in which healthy people are intentionally exposed to infection, may, they believe, speed vaccine development.<\/p>\n

1Day Sooner reports that more than 35,000 people from 160 countries, including Canada, are ready to volunteer to be exposed to COVID-19<\/a>.<\/p>\n

But should we let them?<\/p>\n

Many find the idea of human challenge studies<\/a> surprising. Why would scientists want to expose healthy volunteers to an infectious disease? One reason is to efficiently conduct a preliminary test of a new vaccine.<\/p>\n

In a vaccine challenge study, participants are given either a new vaccine or a placebo and then deliberately exposed to the infectious agent. If fewer people who were given the vaccine become ill compared to the placebo group, we have preliminary evidence the vaccine works.<\/p>\n

Challenge studies stand traditional clinical trials on their head. In a clinical trial, the patient receives a novel treatment that may improve her medical condition. There are risks from experimental treatment, but those risks are offset by the prospect of direct benefit to the patient.<\/p>\n

Challenge studies, by contrast, deliberately seek to make healthy volunteers sick and offer no prospect of direct benefit. Because challenge studies do not benefit volunteers, we limit the risk to which they may be exposed for scientific ends.<\/p>\n

Ethical research<\/h2>\n

Can we ethically conduct a vaccine challenge study involving COVID-19? According to current ethical guidelines<\/a>, published in 2016 and on which I served as co-author, the ethical permissibility of challenge studies entails a range of requirements, including a compelling scientific rationale, minimization of risks to participants and detailed informed consent ethical guidelines for human challenge studies.<\/p>\n

A key provision requires that \u201cvolunteers will under no circumstances be exposed to the risks of irreversible, incurable or possibly fatal infections.\u201d And while challenge studies were used to develop vaccines for cholera and malaria<\/a>, this research was permissible because there are drugs that reliably cure both illnesses.<\/p>\n

But the proposal to conduct challenge studies of COVID-19 fails to satisfy this key ethical requirement. The mortality rate for COVID-19 in Canada is 7.3 per cent<\/a>. Even if challenge studies were restricted to adults in their 20s, the risk of death is 0.03 per cent, or about one in 3,000 patients<\/a>.<\/p>\n

While the primary impact of COVID-19 appears to be on the lungs, it is now clear that the disease affects many organs<\/a>, leaving some patients with lasting disabilities. As yet, there is no curative treatment for COVID-19.<\/p>\n

Challenging ethics<\/h2>\n

Researchers have argued that we ought to change widely accepted ethical standards to allow COVID-19 challenge studies<\/a>, claiming that challenge studies could greatly speed the development of a COVID-19 vaccine and, as a consequence, \u201cthe savings in human lives could be in the thousands or conceivably millions.\u201d<\/p>\n

In a recent TED talk<\/a>, bioethicist Nir Eyal claims that the threshold for permissible risk in challenge studies is too low. We allow adults to donate a kidney to a person in need of a transplant even though this involves a risk of death of one in 3,000 to the donor.<\/p>\n

Why not allow healthy volunteers to agree to similar risks in a COVID-19 challenge study?<\/p>\n