Infection

Definition

Infection is the invasion and multiplication of pathogenic microorganisms in the body, leading to tissue damage and disease. It can be caused by bacteria, viruses, fungi, or parasites.

5 Must Know Facts For Your Next Test

1. Pathogenicity refers to an organism's ability to cause disease.
2. Bacterial infections of the gastrointestinal tract are often caused by ingestion of contaminated food or water.
3. Symptoms of gastrointestinal infections include diarrhea, abdominal pain, nausea, and vomiting.
4. Virulence factors like toxins and adhesion molecules help bacteria establish infections in the host.
5. The immune system plays a crucial role in combating infections through mechanisms like inflammation and phagocytosis.

Review Questions

• What are common symptoms of bacterial infections in the gastrointestinal tract?
• How do virulence factors contribute to the pathogenicity of bacteria?
• What role does the immune system play in fighting infections?

Related terms

Pathogenicity:

The ability of a microorganism to cause disease.

Virulence Factor: Molecules produced by pathogens that contribute to their ability to cause infection.

Phagocytosis:

The process by which certain cells engulf and digest microorganisms and cellular debris.