How did Covid-19 begin? Some propose a “lab-leak” hypothesis, according to which Chinese virologists working on ways to make bat coronaviruses more dangerous to humans did too well at that and then let it escape. Others think it more likely that, like many other diseases, Covid-19 is naturally “zoonotic”. What? Zoon is the ancient Greek for “animal”, hence “zoologist” and, um, “zoo”. Nosos, meanwhile, is the Greek for “disease”, hence many artful coinages that have, alas, fallen into desuetude, such as “nosography” (17th century), the description of illness, or “nosotrophous”, disease-causing. A disease that is “zoonotic” has jumped the species barrier. The technical medical lexicon, happily, still includes the term “nosology”. Whether Covid-19 is zoonotic awaits further nosological developments.…
