The US has vaccinated more than half its adults with one dose. But rates are slipping
Some modellers predict that Covid-19 will fade more quickly than previously assumed
Evidence of symptomless transmission was dismissed by health officials for months
High number of asymptomatic cases is complicating efforts to predict pandemic’s course
A new study could have implications for how we can best avoid transmission of the virus
Edition 1: Researchers assessing number of undiagnosed and how infectious these people are
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