Final answer:
The Black Death, caused by 'Yersinia pestis', included three forms: bubonic, septicemic, and pneumonic, all characterized by high mortality rates and severe symptoms like buboes, necrosis, and respiratory failure.
Step-by-step explanation:
The Black Death is a plague whose symptoms include sharp pains, sudden dizziness, bleeding from pores, and death within 30 minutes. One of the deadliest pandemics in human history, it was caused by the bacterium Yersinia pestis. The Black Death manifested in three forms: the bubonic plague, which produced swelling of lymph nodes (buboes) and had a rapid course often leading to death; the septicemic plague, characterized by darkened (necrotic) tissue, severe abdominal pain, and shock, with a very high mortality rate; and the pneumonic plague, which infected the lungs, leading to rapid respiratory failure and shock.
All forms displayed high mortality rates, particularly without antibiotic treatment, which was not available during medieval times. Details of various symptoms, such as fever, headache, joint pain, diarrhea, vomiting, hemorrhaging in the gastrointestinal tract, and organ failure, highlight the seriousness and often fatal outcomes of the Black Death's different forms.