What is the primary cause of infectious diseases?

The primary cause of infectious diseases is pathogens, which include a variety of microorganisms such as bacteria, viruses, fungi, and parasites. These pathogens are capable of invading the body, reproducing, and causing damage to cells and tissues, which leads to the symptoms and health issues associated with infectious diseases. Understanding the role of these pathogens is crucial for both prevention and treatment strategies aimed at controlling and managing infectious diseases.

While other factors like inherited genetic mutations, poor nutrition, and environmental toxins can affect overall health and vulnerability to disease, they do not directly cause infectious diseases. Instead, they may influence an individual's immune response or susceptibility to infections when they occur.