Immune Deficiency causes
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Infection is the invasion and replication of microorganisms-viruses, bacteria, protozoa, or fungi-in body tissues.
Infectious diseases are those that are transmitted from person to person by direct or indirect contact. Viruses, bacteria, parasites, and fungi all cause infectious disease.
A nutritional deficiency occurs when the body doesn't absorb the necessary amount of a nutrient. Symptoms include a pale complexion, fatigue, hair loss, and depression.