The first wave of the COVID-19 pandemic may be waning. For vaccine developers, that could be a problem.
Scientists in Europe and the United States say the relative success of draconian lockdown and social distancing policies in some areas and countries means virus transmission rates may be at such low levels that there is not enough disease circulating to truly test potential vaccines, according to Reuters.
They may need to look further afield, to pandemic hotspots in Africa and Latin America, to get convincing results.
“Ironically, if we’re really successful using public health measures to stamp out the hot spots of viral infection, it will be harder to test the vaccine,” said Francis Collins, director of the National Institutes of Health in the United States.
A vaccine is seen as essential to ending a pandemic that has killed nearly 370,000 people and infected more than 6 million so far, with world leaders looking at inoculation as the only real way to restart their stalled economies.
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