At first, we thought this week's issue of the CDC's Morbidity and Mortality Report was utterly run-of-the-mill.

We skimmed a report on leisure-time activity among adults with and without arthritis and an update on flu activity before we were stopped in our tracks by something we'd never seen before: a case report on Campylobacter jejuni infections contracted by two people working on a sheep ranch, apparently because they used their teeth to castrate some lambs.

C....