What are the main causes of disease?

The primary cause of disease can indeed be attributed to germs, which encompass a variety of pathogens including bacteria, viruses, fungi, and protozoa. Germs, as microorganisms, can invade the body, multiply, and disrupt normal physiological functions, leading to illness. This category includes both well-known infectious agents and those that may cause diseases without immediately apparent symptoms.

While germs are a significant cause of disease, it's important to recognize that other factors such as genetic predispositions and environmental influences also play critical roles in overall health. Genetic factors can predispose individuals to certain diseases, while environmental toxins may contribute to conditions like respiratory issues or cancers. However, in the context of infectious diseases specifically, germs are the most direct and common cause, often responsible for outbreaks and the spread of illness from person to person. Understanding this helps highlight the importance of infection control practices, such as hand hygiene and vaccination, in preventing the transmission of diseases caused by these pathogens.