Plague doctor
From Tardis Wiki, the free Doctor Who reference
Plague doctors were physicians who specialised in the treatment of bubonic plague. They could be recognised by their heavy outfits and beak-like masks.
The Macro-viruses disguised themselves as plague doctors so they could reproduce. (COMIC: Black Death White Life)
In the early 20th century, Torchwood Three encountered plague doctors. (PROSE: Risk Assessment)