Staphylococcus aureus is a causative agent for purulent diseases affecting human beings and it is considered by health industry and the general public as an important pathogen that causes infection. It has also generated interest regarding the importance of appearance of resistant bacteria. This res...
Staphylococcus aureus is a causative agent for purulent diseases affecting human beings and it is considered by health industry and the general public as an important pathogen that causes infection. It has also generated interest regarding the importance of appearance of resistant bacteria. This research has been conducted to identify the relationship between antibiotic resistant S.aureus, which was collected during the period from 1989 to 1990, for the very first research. The secondary research was re-taken by collecting S.aureus from 2005 to 2006. Lastly, the latest research had taken place from November 2010 to December 2010 . During the latest research periods above(2010), we have obtained fifty seven strains of S.aureus from hospital located in Busan and compared them to the antibiotic resistance patterns by disk method. The result revealed that ampicillin(Am) as the highest with the resistance level of 98.2%, cephalothin of 84.2%, and cefotaxime of 86% amongst antibiotic affiliated with β-lactam. In the case of Ac, concoction of both clavulanic acid and amoxicillin, which inhibits β-lactamase, demonstrated the resistance level of 72%; it was much higher than the level of 48% presented in previous studies. Compared to the resultes of the study taken place 5 years ago, Sa, which was amoxicillin combined with sulbactam, indicated a slightly lower resistance level this time. Regarding the aminoglycoside resistance toward antibiotic, streptomycin in the resistance level as much as 42.1%, amikacin in the high level of 86%; netilmicin, which demonstrated a relatively lower resistance level in the previous study, however, demonstrated the high level of 71.9%. Tc, in the resistance of tetracycline, demonstrated a high resistance level of 84%; doxycycline, which would not likely to be used in clinical circumstances, did not dissever any resistant strains in this study as well. In case of vancomycin, not even a single resistant strain was isolated, considering it a fortunate phenomenon. All antibiotics except for 4 antibiotics of St, Va, Dc, and Sa accomplished relatively higher in the resistance level than in previous study. Although it was restricted only in a few regions of Busan, the generally higher resistance level, than the study taken place 5 years ago, was considered to be an anxiety. By having small-sized plasmids isolated from S.aureus with the complete nucleotide sequence, to have it investigated under the BLAST analysis program by NCBI resulted in characterization of plasmids that belong to the current S.aureus. S.aureus EY26, S.aureus EY27, and S.aureus EY41 all shared pKH22 and these were found to have cadmium resistant plasmid. The comparable plasmids were identified as pC55s isolated from the United States and pKH18 isolated from Korea. Two different plasmids in small sizes named pKH23 and pKH24 were isolated from S.aureus EY52; pKH23 was identified cryptic plasmid and it was found to be a similar plasmid to what was isolated from Korea in 2006, known as pKH14. Chloramphenicol resistant plasmid was identified in pKH24. It was similar to pKH13 and pKH15 which were isolated from the previous study. Cryptic plasmid pKH25 was found within S.aureus EY57. These materials are considered to be utilized in future studies in terms of plasmid as there is a definite necessity for further research to identify unknown functionality of plasmid.
Staphylococcus aureus is a causative agent for purulent diseases affecting human beings and it is considered by health industry and the general public as an important pathogen that causes infection. It has also generated interest regarding the importance of appearance of resistant bacteria. This research has been conducted to identify the relationship between antibiotic resistant S.aureus, which was collected during the period from 1989 to 1990, for the very first research. The secondary research was re-taken by collecting S.aureus from 2005 to 2006. Lastly, the latest research had taken place from November 2010 to December 2010 . During the latest research periods above(2010), we have obtained fifty seven strains of S.aureus from hospital located in Busan and compared them to the antibiotic resistance patterns by disk method. The result revealed that ampicillin(Am) as the highest with the resistance level of 98.2%, cephalothin of 84.2%, and cefotaxime of 86% amongst antibiotic affiliated with β-lactam. In the case of Ac, concoction of both clavulanic acid and amoxicillin, which inhibits β-lactamase, demonstrated the resistance level of 72%; it was much higher than the level of 48% presented in previous studies. Compared to the resultes of the study taken place 5 years ago, Sa, which was amoxicillin combined with sulbactam, indicated a slightly lower resistance level this time. Regarding the aminoglycoside resistance toward antibiotic, streptomycin in the resistance level as much as 42.1%, amikacin in the high level of 86%; netilmicin, which demonstrated a relatively lower resistance level in the previous study, however, demonstrated the high level of 71.9%. Tc, in the resistance of tetracycline, demonstrated a high resistance level of 84%; doxycycline, which would not likely to be used in clinical circumstances, did not dissever any resistant strains in this study as well. In case of vancomycin, not even a single resistant strain was isolated, considering it a fortunate phenomenon. All antibiotics except for 4 antibiotics of St, Va, Dc, and Sa accomplished relatively higher in the resistance level than in previous study. Although it was restricted only in a few regions of Busan, the generally higher resistance level, than the study taken place 5 years ago, was considered to be an anxiety. By having small-sized plasmids isolated from S.aureus with the complete nucleotide sequence, to have it investigated under the BLAST analysis program by NCBI resulted in characterization of plasmids that belong to the current S.aureus. S.aureus EY26, S.aureus EY27, and S.aureus EY41 all shared pKH22 and these were found to have cadmium resistant plasmid. The comparable plasmids were identified as pC55s isolated from the United States and pKH18 isolated from Korea. Two different plasmids in small sizes named pKH23 and pKH24 were isolated from S.aureus EY52; pKH23 was identified cryptic plasmid and it was found to be a similar plasmid to what was isolated from Korea in 2006, known as pKH14. Chloramphenicol resistant plasmid was identified in pKH24. It was similar to pKH13 and pKH15 which were isolated from the previous study. Cryptic plasmid pKH25 was found within S.aureus EY57. These materials are considered to be utilized in future studies in terms of plasmid as there is a definite necessity for further research to identify unknown functionality of plasmid.
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