Health 4

• When a person gets sick because of a disease-causing

  Infection
• It enters the body and multiplies

  Pathogen
• It is considered the smallest disease-causing pathogen and is nonliving.

  virus
• These are single-celled

  microorganisms that live nearly everywhere.

  Bacteria
• These are more complex than bacteria. Some of the diseases they cause are malaria and dysentery.

  protozoa
• These are pathogens that are much smaller than bacteria but multiply like viruses. Typhus is caused by this particular pathogen.

  Rickettsia
• These are single-celled or multi-celled organisms that feed on organic materials like plants, animals, and food.

  Fungi
• are disease-causing

  microorganisms..

  Pathogens
• is the time between exposure to a pathogen and the appearance of symptoms.

  Incubation stage
• is the time when the signs and symptoms of a disease start to appear.

  Pandromal stage
• is the period when the disease is at its peak and the signs and symptoms can be clinically used or tested to diagnose the disease.

  acute stage
• is the period when symptoms start to subside and the severity of the disease declines.

  declining stage
• is the stage in which the symptoms of the disease begin to fade and the patient recovers his or her health and strength.

  Convalscent stage
• Quality of being unhealthful

  Morbidity
• Being subject to death


  Mortality