Definition: The word "disease" in English typically refers to a set of symptoms or signs that accompany an illness, which are often caused by a virus or bacteria. The term is used as a medical term because it can refer to several different conditions, including viral infections such as influenza, bacterial infections like pneumonia, and viral hepatitis.
Diseases have been studied for centuries, with evidence suggesting that the human body has evolved to recognize and combat specific types of pathogens. The modern understanding of disease emerged from the work of scientists, such as Louis Pasteur, who believed that certain microorganisms caused various diseases in humans.
Diseases are divided into several categories based on their symptoms: infectious (e.g., influenza, COVID-19), parasitic (e.g., malaria, roundworms), and chronic (e.g., arthritis). Other categories include autoimmune disorders (like lupus) or those related to the immune system (like multiple sclerosis).
disease(s)