Staphylococcus aureus is the most dangerous of all staphylococcal bacterial strains. Staphylococcus aureus is a Gram positive, round-shaped bacterium, and often cause skin infections, pneumonia, heart valve infections, and bone infections. These bacteria are spread by direct contact with an infected person, by touching the contaminated object, or by inhaling infected droplets dispersed by sneezing or coughing. Skin infections are common, but the bacteria can spread through the bloodstream and infect distant organs. An estimated 20% to 30% of the human population are long-term carriers of S. aureus which can be found as part of the normal skin flora, in the nostrils, and as a normal inhabitant of the lower reproductive tract of women. It is one of the five most common causes of hospital-acquired infections making it an ideal choice for antibacterial testing.
Escherichia coli (E. coli) are a group of gram-negative bacteria that normally reside in the intestine of healthy people, but some strains can cause infection in the digestive tract, urinary tract, or many other parts of the body. People develop intestinal E. coli infections by eating contaminated food, touching infected animals, or swallowing contaminated water in a pool. Intestinal infections can cause diarrhea, sometimes severe or bloody, and abdominal pain. 75% to 95% of urinary tract infections are caused by E. coli.
E. coli outbreaks occur every few years making it an ideal choice for antibacterial testing.
Klebsiella pneumoniae is a Gram-negative, non-motile, encapsulated, lactose-fermenting,facultative anaerobic, rod-shaped bacterium. That can cause different types of healthcare associated infections, including pneumonia, bloodstream infections, wound or surgical site infections, and meningitis. In the general community, 5% to 38% of individuals carry the organism in their stool and 1% to 6% in the nasopharynx. Klebsiella bacteria spreads through person-to-person contact or, less commonly, by contamination of the environment.In the general community, 5% to 38% of individuals carry the organism in their stool and 1% to 6% in the nasopharynx. Klebsiella bacteria spreads through person-to-person contact or, less commonly, by contamination of the environment.