Opinion: New virus found in China is another hard-to-predict threat

Just when you thought that 2022 already had provided a century's worth of scary infectious diseases, from Covid-19 to monkeypox to polio, last week's headlines warned of yet another. In eastern China, the Langya virus may have jumped from the white-toothed shrew to humans. It has sickened dozens of people, but has caused no reported deaths.