Vaccine - A biological preparation that improves the immune system’s ability to recognize and destroy harmful infectious agents.⏎
Toxin - A poisonous substance, often a protein, produced by the metabolic processes of living cells or organisms that can cause disease if introduced into the body.⏎
Skin Lesion - Any abnormal tissue on the skin caused by injury or disease.⏎
Suburbanization - The process of land conversion and development around the periphery of major cities.⏎
Strain - A genetic variant or specific subtype of a microorganism, such as a virus or bacteria.⏎