Could you tell me where you found that?
You can find it on Wikipedia under Dr Schnabel it reroutes to a discussion on drs during the plague
Used a *bing* search; IIRC, keywords :**Funny black plague**
http://middleagestoday.com/assets/styles/large/public/files/news/reenactment%20news%20plague.jpg
The beak doctor costume has a fascinating origin:
http://www.doctorsreview.com/history/doctors-black-death/