22.4: Bacterial Diseases in Humans Last updated Save as PDF Page ID 13566 Boundless Boundless 22.4A: History of Bacterial Diseases Infectious diseases, spread from person to person by bacteria, are among the leading causes of death despite advances in medical research. 22.4B: Biofilms and Disease 22.4C: Antibiotics- Are We Facing a Crisis? Excessive use of antibiotics in animals or as imprudent medical treatments has resulted in the propagation of antibiotic-resistant bacteria. 22.4D: Bacterial Foodborne Diseases Foodborne diseases can be associated with bacteria-caused illnesses in both animal and plant-based food sources.