signs - illness are visible or measureable changes. Some changes are swelling, soreness, breathing difficulties, elevated blood pressure, or fast heart rate., symptoms - feelings that someone experiencing the disease expresses. They are not precisely measureable or even visible. Pain, dizziness, and cramping are common symptoms., diagnosis - Determining the cause and nature of a disease, transmission - infectious diseases spread from person to person through a process called, communicable diseases - Infectious diseases that can transmit to humans, chain of transmission - The process for spreading a communicable disease to another person,

Types of Pathogens 2

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