What best defines an infectious disease?

Medical Definition of infectious disease : a disease (as influenza, malaria, meningitis, rabies, or tetanus) caused by the entrance into the body of pathogenic agents or microorganisms (as bacteria, viruses, protozoans, or fungi) which grow and multiply there — compare communicable disease, contagious disease.Click to see full answer. Similarly, you may ask, what defines an infectious disease?Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They’re normally harmless or even helpful. But under certain conditions, some organisms may cause disease. Some infectious diseases can be passed from person to person.Also, what is an example of a infectious disease? Infectious diseases are diseases caused by living organisms like viruses and bacteria. They can be passed from person to person through body secretions, insects or other means. Examples are SARS, influenza, the common cold, tuberculosis (TB), Hepatitis A and B. Subsequently, one may also ask, what are the 4 types of infectious diseases? Types of infection include bacterial, fungal, viral, protozoan, parasitic, and prion disease. They are classified by the type of organism causing the infection. Infections can range from mild inflammation in one person to an epidemic.What are the most common infectious diseases? Common Infectious Diseases Chickenpox. Common cold. Diphtheria. E. coli. Giardiasis. HIV/AIDS. Infectious mononucleosis. Influenza (flu)