Get Bacterial Pathogens And Normal Flora Of Human

The human body, which contains about 1013 cells, routinely harbors about 1014 bacteria (Fig. 6-1). This bacterial population constitutes the normal microbial flora . The normal microbial flora is relatively stable, with specific genera populating various body regions during particular periods in an individual's life.

They stimulate production of cross-reactive antibodies. Since the normal flora behave as antigens in an animal, they induce low levels of antibodies that cross react with similar antigens on pathogens, preventing infection or invasion.

Normal Flora of Skin Staphylococcus epidermidis. S. epidermidis is a major inhabitant of the skin, and in some areas it makes up more than 90 percent of the resident aerobic flora. Staphylococcus aureus. ... Micrococci. ... Diphtheroids (Coryneforms) ... Streptococci. ... Gram-Negative Bacilli. ... Nail Flora.

There are three basic bacterial shapes: Spheres or ball-shaped (cocci bacteria). Rod-shaped bacteria (bacilli). Spirals or helixes (spirochetes).

Somewhere between 300 and 1000 different species live in the gut, with most estimates at about 500. However, it is probable that 99% of the bacteria come from about 30 or 40 species, with Faecalibacterium prausnitzii (phylum firmicutes) being the most common species in healthy adults.

The majority of the bacteria found in the body live in the human gut. There are billions of bacteria living there (Figure 2).

Species commonly found in humans: Staphylococcus epidermidis, Staphylococcus aureus (potential pathogen). What it does: This is one of the most common microbes found on the human skin and nose. About 25% of healthy people carry this bacteria, ing to the CDC.

Examples of pathogenic bacteria: Pseudomonas aeruginosa - can cause pneumonia and blood infections. Mycobacterium tuberculosis - causes tuberculosis. Listeria - causes foodborne infections and flu-like symptoms. Salmonella - causes typhoid. E. coli - causes intestinal infections with symptoms like fever and diarrhea.