The plague took several forms, including bubonic plague and pneumonic plague. Fleas, carried mainly by rats, spread the bubonic form, and droplets sprayed from infected persons most often spread the pneumonic form.
प्लेगचे अनेक प्रकार दिसून आले, मुख्यतः गाठीचा प्लेग आणि फुफ्फुसदाहक अर्थात प्लेगजन्य न्युमोनिया.