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Communicable Disease

A disease that is spread from one living thing to another or through the environment


A condition that occurs when pathogens in the body multiply and damage body cells


a piece of genetic material covered in a protein coat


single-celled microorganism that live almost everywhere on earth


substances that kill cells or interfere with their functions


an organism that carries and transmits pathogens to humans or other animals

Respiratory Tract

passageway that makes breathing possible

Mucous Membrane

the lining of various body cavities including the nose, ears, and throat

Respiratory Infections

Common Cold, Flu, Pneumonia, Strep Throat, Tuberculosis


an infection of the lungs in which the airs sacs fill with pus and other liquids


Yellowing of the skin and eyes


scarring of the liver

Immune System

a network of cells, tissues, organs, and chemicals that fights off pathogens

Inflammatory Response

a reaction to tissue damage caused by injury or infection


white blood cells that attack invading pathogens


substances that can trigger an immune response


the state of being protected against a particular disease


specialized white blood cell that coordinates and performs many functions of specific immunity


a protein that acts against a specific antigen


a preparation of dead or weakened pathogens that are introduced into the body to stimulate the immune response

Emerging Infections

communicable diseases whose occurrence in humans has increased within the past two decades or threatens to increase int he near future


a disease outbreak that affects many people in the same place and at the same time


a global outbreak of an infectious disease

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