Word: staphylococcus
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...Staphylococcus aureus is a dreadful pathogen that invades the body of certain patients after surgery. It most frequently attacks people with weak immune systems, namely infants and the elderly. Intravenous drug users can also be susceptible to community-acquired staphylococcus aureus...
...study was motivated by Hiramatsu's 1996 discovery of vancomycin-resistant staphylococcus aureus (VRSA) in a four-month-old male infant suffering from staphylococcus aureus infection after open-heart surgery. The patient failed to respond to vancomycin therapy and was cured only with a combination of other antibiotics. The strain was named Mu50 and became known as the world's first case of VRSA...
Hiramatsu also discovered that several strains of staphylococcus aureus--namely the Mu3 strain--had the potential of developing into VRSA. Hiramatsu reported that after repeated treatment with vancomycin, Mu3 developed a resistance level equal to Mu50, the VRSA strain. With each dosage of vancomycin the doctor prescribed, the more resistant the population grew, until it became just steps away from full-blown resistance...
...What is Staphylococcus Aureus...
...Staphylococcus aureus, an "elite force" in the bacteria battalion, is an adaptable organism that has always developed antibiotic resistance with haste. For example, staphylococcus aureus becomes resistant to erythromycin, a protein inhibitor, after only seven to ten days. Resistance to penicillin developed a few years after its commercial production in 1941, and resistance to four or more antibiotics became the norm for 40 percent of the strains by the end of the 1950s...