Tiny, single celled organisms that can only be seen with a microscope.

• Microorganisms

• Micronutrients

• Epithelial cells

• Micronutrients

Answer explanation

These are SMALL organisms- so MICRO organisms

The theory that states that specific microorganisms cause specific diseases.

• Organism theory

• Germ theory

• Disease theory

• Health theory

Microorgansims that cause infectious diseases

• Pathogens

• Microorgansims

• Germs

• Bacteria

Answer explanation

Remember, not all bacteria cause diseases!

Evidence of disease that can be outwardly observed or measured are called:

• Signs

• Symptoms

• Indicators

• Alterations

Examples of this type of microorganism include mushrooms, molds, and yeast.

• Bacteria

• Viruses

• Fungi

• Parasites

This category of microorganisms consists of protozoa and worms.

• Bacteria

• Viruses

• Fungi

• Parasites

The time between the pathogen's entrance to the body and BEFORE the first symptoms of disease.

• Convalescent stage

• Incubation stage

• Clinical stage

Answer explanation

The incubation stage is the first stage, where the pathogen starts growing and reproducing.

When is a person the MOST contagious?

• Convalescent stage

• Incubation stage

• Clinical stage

Answer explanation

Remember, the clinical stage is when the infection is most severe!

In this stage of an infection, the signs and symptoms of a disease start to fade and the person is no longer contagious.

• Clinical stage

• Incubation stage

• Convalescent stage

During which stage of an illness or disease do characteristic signs and symptoms arise?

• Convalescent stage

• Incubation stage

• Clinical stage