How many types of bacterial infections are there?

Bacterial infections can be categorized into several types based on the bacteria involved, the site of infection, and the severity of the illness. Common types include respiratory infections (like pneumonia), skin infections (such as cellulitis), urinary tract infections, gastrointestinal infections, and systemic infections (like sepsis). Additionally, bacteria can be classified as gram-positive or gram-negative, influencing their treatment and the infections they cause. Overall, there are numerous bacterial infections with various classifications, making it difficult to pinpoint an exact number.