What is an infection? – Pharmacology | Lecturio

The video begins by defining infection and emphasizing its importance for nurses to understand the impact, signs, symptoms, and treatment. It illustrates with an extreme case of a brain abscess originating from an untreated tooth infection, highlighting the consequences of neglecting early infections.

An infection occurs when the body's normal host defenses (like skin, cilia, gastric acid, and the immune system) are breached, compromised, or overpowered. Bacteria enter the body through various pathways (mouth, nose, ears, skin pores, or broken skin) and begin to grow and multiply in body tissues, overwhelming the immune system.

Individuals who are immunocompromised (due to chemotherapy, corticosteroids, or other immune system issues) are at a higher risk of developing infections. Any break in the skin, such as a paper cut, skinned knee, surgical incision, or even injections, provides a point of entry for bacteria, increasing the risk.

Once bacteria enter through a break in the skin, immune cells, marked by antibodies, gather to destroy them. However, bacteria rapidly multiply. An infection arises when the immune system is overpowered or outnumbered by these multiplying bacteria, leading to a full-blown infection. Nurses should be vigilant about any skin punctures that could lead to infection.