What is a harmful effect of monerans?

Monerans, which include bacteria and archaea, can have harmful effects such as causing Infectious Diseases in humans, animals, and plants. Pathogenic bacteria, for instance, can lead to illnesses ranging from mild infections to severe conditions like pneumonia or meningitis. Additionally, some monerans can produce toxins that contaminate food and water supplies, leading to foodborne illnesses. Overall, while many monerans are beneficial, certain types can pose significant health risks.