SAN JUAN, Puerto Rico — Dengue is sweeping across the Western Hemisphere in numbers not seen since record-keeping began more than four decades ago, with experts warning that rising temperatures and rapid urbanization are accelerating the pace of infections.
A study today of viral shedding dynamics in 101 children who had COVID-19 during the Omicron surge in Toronto shows that 40% were still infectious on the day after their symptoms resolved.
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