This undated photo provided by Ishaq Abdel-Wareth shows Dr. Yassin Abdel-Wareth, center, one of a handful of epidemiologists in Yemen who died of COVID-19 on June 16, 2020, in Sanaa, Yemen. His family said he may have contracted the virus while inspecting a quarantine facility set up outside the capital, Sanaa, by Houthi rebels, who had been concealing the virus's spread within Yemen. (Ishaq Abdel-Wareth via AP)
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