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Research Article: Identification and Characterization of a Vancomycin Intermediate-Resistant Staphylococcus haemolyticus Isolated from Guangzhou, China

Date Published: 2023-06-08

Abstract:
Coagulase-negative Staphylococci (CoNS), a kind of bacteria colonizing on body surfaces, oral cavities and intestinal tracts, is considered to be no pathogenicity originally. Comparing with Staphylococcus aureus, the virulence of CoNS is much lower and it produces free coagulase. However, since s, with increased CoNS infections reported, CoNS has been recognized as one of the important opportunistic pathogens that cause many nosocomial infections. At present, CoNS often causes infections, particularly the patients with low immunity and using indwelling and implantable medical devices.– In human infections, Staphylococcus epidermidis, Staphylococcus haemolyticus and Staphylococcus saprophyticus are the most common CoNS. The antibiotic resistance of CoNS poses a big concern on human health because most of CoNS show a high adaptability to the host and hospital environment and exhibit high multidrug resistance (MDR)., Because of the widespread use of penicillin and methicillin in the last century, CoNS have been found resistant to ?-lactam antibiotics and methicillin in most of hospitals., In some medical institution, methicillin-resist CoNS may reach –% and the cross-drug resistance is also serious.– S. haemolyticus is a kind of CoNS and its carrier rate ranks only second to that of S. epidermidis. Vancomycin is a kind of cationic glycopeptide antibiotic and is an important drug for treating MRSA and MRSE infections. However, with the increased applications of vancomycin in recent years, bacteria completely resistant or intermediately resistant to vancomycin have been found and the reported cases are increasing. In our preliminary work, we recovered a S. haemolyticus from a clinical sample of a patient. We found that the strain was intermediately resistant to vancomycin. Therefore, drug-resistant CoNS is certainly a critical challenge for clinical therapy.

Introduction:
Coagulase-negative Staphylococci (CoNS), a kind of bacteria colonizing on body surfaces, oral cavities and intestinal tracts, is considered to be no pathogenicity originally. Comparing with Staphylococcus aureus , the virulence of CoNS is much lower and it produces free coagulase. However, since s, with increased CoNS infections reported, CoNS has been recognized as one of the important opportunistic pathogens that cause many nosocomial infections. At present, CoNS often causes infections, particularly the…

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