What occurs when microbes invade the body producing disease?
Infection occurs when viruses, bacteria, or other microbes enter your body and begin to multiply. Disease, which typically happens in a small proportion of infected people, occurs when the cells in your body are damaged as a result of infection, and signs and symptoms of an illness appear.
How does the immune system defend the body against disease?
The immune system protects the body from possibly harmful substances by recognizing and responding to antigens. Antigens are substances (usually proteins) on the surface of cells, viruses, fungi, or bacteria.
How are infection and disease related in the human body?
An infection is the invasion and multiplication of pathogenic microbes in an individual or population. Disease is when the infection causes damage to the individual’s vital functions or systems. An infection does not always result in disease! To cause an infection, microbes must enter our bodies.
What do you call microbes that cause disease?
Microbes that cause disease are called pathogens. It is important to remember that: A pathogen is a micro-organism that has the potential to cause disease. An infection is the invasion and multiplication of pathogenic microbes in an individual or population.
Where do microbes enter the human body to cause disease?
To cause an infection, microbes must enter our bodies. The site at which they enter is known as the portal of entry. Microbes can enter the body through the four sites listed below: Respiratory tract (mouth and nose) e.g. influenza virus which causes the flu. Gastrointestinal tract (mouth oral cavity) e.g. Vibrio cholerae which causes cholera.
Where are the diseases located in the body?
The color of the skin signifies different types of skin conditions. Some of the skin diseases are visible through a color or some color patches which appear on the skin. Skin cancer… Salivary glands are located inside the mouth cavity and are functionally designed to produce saliva.
What kind of disease can a pathogen cause?
Once inside the body, S. epidermidis can cause serious infections such as endocarditis, and it produces virulence factors that promote the persistence of such infections. To cause disease, a pathogen must successfully achieve four steps or stages of pathogenesis: exposure (contact), adhesion (colonization), invasion, and infection.
How does an organism cause disease in a host?
The ability of an organism to cause disease in a host is known as its virulence or pathogenicity. Many microorganisms unable to cause disease under most conditions may cause disease under certain conditions. Therefore, such microorganisms would be considered pathogenic in that particular host under the existing conditions.
What do you call the ability of an organism to cause disease?
Explain the roles of portals of entry and exit in the transmission of disease and identify specific examples of these portals The ability of a microbial agent to cause disease is called pathogenicity, and the degree to which an organism is pathogenic is called virulence .
How does an active bacterial infection cause disease?
An active infection develops and the bacteria release potent toxins that cause edema (fluid buildup in tissues), hypoxia (a condition preventing oxygen from reaching tissues), and necrosis (cell death and inflammation).