By James White
"It's a massive hospital space station on the Galactic rim--384 levels, a staff of thousands--where human and alien medicine meet. But Patient Hewlitt, new to Sector General, doesn't want to meet alien medicine--or alien doctors, or alien nurses, or aliens of any kind. Which is just too bad; he's an interesting case, and he'll have to get used to it. In the meantime, it's always been an article of faith among Sector General's multispecies staff that infections can't pass from one alien race to another. But in this season of anomalies, it looks like they might have their first-ever interstellar virus on their hands, their tentacles, their cilla...."