Sep 19, 2025 · An infection occurs when a microorganism — such as bacteria, fungi, or a virus — enters a person’s body and begins multiplying.

An infection is the invasion of tissues by pathogens, their multiplication, and the reaction of host tissues to the infectious agent and the toxins they produce. [1] . An infectious disease, also known as a …

Experts believe about half of all human DNA originated from viruses that infected and embedded their nucleic acid in our ancestors’ egg and sperm cells. Microbes occupy all of our body surfaces, …

An infection is a condition caused by harmful microorganisms such as bacteria, viruses, fungi, or parasites invading the body. These pathogens disrupt normal bodily functions and can lead to a wide …

Respiratory infections (like colds, flu and COVID), stomach flu, STIs and even foot fungus are all examples of infectious diseases. By comparison, noninfectious diseases aren’t caused by germs, but …

Infection is the condition when the host’s cells or tissues come in contact with the infectious parasite or pathogen. In contrast, infectious disease is a rare consequence or an illness resulting from an infection.

infection, the process by which harmful microorganisms such as bacteria, viruses, fungi, or parasites enter cells and tissues in the body and cause disease. Infection may be localized or systemic …

Dec 7, 2023 · According to WHO, an infection is the invasion and multiplication of harmful microorganisms, such as bacteria, viruses, or parasites, within a host organism. Infections can occur …

invasion and multiplication of microorganisms in body tissues, as in an infectious disease. The infectious process is similar to a circular chain with each link representing one of the factors involved in the …

An infection occurs when harmful germs (microorganisms) enter the body, multiply and cause disease. The chain of infection refers to how germs spread (Figure 1.1).