agent definition disease

Bacteria and protozoans are microscopic one-celled organisms, while viruses are even smaller.

To receive email updates about this page, enter your email address: Centers for Disease Control and Prevention. Antibiotic therapy is generally effective, although death from sepsis or meningitis is still common.

Emerging infectious diseases such as Nipah virus and hantavirus Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh …

These five types of disease agents are called primary or immediate causes of the diseases, while the chances of diseases are further increased by certain contributory causes like: (i) Lack of good nourishment (second-level cause) which decreases the disease-resistance power of an individual. (ii) Genetic differences between the organisms.

It is confirmed by blood tests. Biosafety in Microbiological and Biomedical Laboratories (BMBL) 5th Edition, U.S. National Authority for Containment of Poliovirus, Preparedness and Emergency Response Learning Centers, U.S. Department of Health & Human Services. CDC twenty four seven. Bacterial infections are commonly caused by pneumococci, staphylococci, and streptococci, all of which are often commensals (that is, organisms living harmlessly on their hosts) in the upper respiratory tract but that can become virulent and cause serious conditions, such as pneumonia, septicemia (blood poisoning), and meningitis. 2.

Vet on call: Do cows really die of heart failure? Some infectious agents … It is also called as a pathogen.

Most bacteria are surrounded by a capsule that appears to play an important role in their ability to produce disease. This research allows us to protect our communities should danger occur. [L. ago, pres. Agent originally referred to an infectious microorganism or pathogen: a virus, bacterium, parasite, or other microbe. I would like to know the long term effects of this dye. Thank you. The conjunctiva, which covers the front of the eye, may be penetrated by viruses that cause a local inflammation of the eye or that pass into the bloodstream and cause a severe general disease, such as smallpox. Generally, the agent must be present for disease to occur; however, presence of that agent alone is not always sufficient to cause disease. ; or exogenous e.g. Staphylococci produce a type of septicemia with high spiking fever; the bacteria can reach almost any organ of the body—including the brain, the bones, and especially the lungs—and destructive abscesses form in the infected areas. Young children sometimes develop ear infections, laryngitis, and upper respiratory tract disease from Chlamydia. Which of these congenital disorders is characterized by an extra chromosome? Airborne transmission. Please select which sections you would like to print: Corrections? Staphylococci and streptococci are common causes of skin diseases.

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