How does plague spread?

Plague primarily spreads through (a) Bacteria. It is caused by the bacterium Yersinia pestis. Transmission occurs through the bite of infected fleas, primarily from rodents like rats, squirrels, and prairie dogs. Additionally, handling infected animals or inhaling respiratory droplets from infected individuals, particularly in cases of pneumonic plague, can also lead to transmission. Plague is not caused by protozoa (b) or viruses (c). While certain diseases caused by protozoa or viruses can spread similarly through vectors or respiratory droplets, plague specifically involves the bacterium Yersinia pestis as its causative agent.