Is an agent that cause infections and diseases.

Pathogens such as bacteria, fungi, parasites, and viruses are agents that mainly cause infectious diseases in the body.

Further Explanation:

Many pathogen or organism is present inside or outside the body. Sometimes they are harmless and sometimes they are beneficial for the body. But in certain cases, these organisms can develop the infectious disease in the body. These organisms can be bacteria, fungi, viruses, and parasites. Infection can develop when these organisms enter inside the body and replicate.

They can pass from one individual to another through air or water. The contaminated water or food can directly infect the organism's health. The symptoms and signs of an infectious disease depending on the intensity of infection. Like mild infection can be treated at home but life-threatening infection needs proper care. General symptoms of infectious disease are:

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Microbiology

Keywords:

Infection, pathogen, virus, bacteria, fatigue, diarrhea, muscle ache, fever, coughing, disease, water, air, replicate, fungi, parasite, health, body, disease.