Which of the following can lead to disease as a result of infection?

Bacteria are single-celled microorganisms that can cause a wide range of diseases in humans, animals, and plants. They can invade host systems and multiply, leading to infections that may produce various symptoms and health issues. Examples of bacterial diseases include strep throat, tuberculosis, and bacterial pneumonia.

While viruses and parasites can also lead to disease through infections, the question focuses specifically on the impact of bacteria. It highlights their role in disease progression and the mechanisms by which they cause illness. Infections in general could encompass a broad range of pathogens, making the choice of bacteria specific and relevant to the context of the question.