Vaccine - A biological preparation that improves the immune system’s ability to recognize and destroy harmful infectious agents.⏎
Symptom - A subjective indication of the presence of disease or a departure from the body’s normal state of functioning. ⏎
Zoonoses - Any disease that can be transmitted from vertebrate animals to humans.⏎
Suburbanization - The process of land conversion and development around the periphery of major cities.⏎