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PREVALENCE AND ANTIMICROBIAL SUSCEPTIBILITY PATTERN OF

The emphasis of this study was on the sensitivity of the antibiotics to pathogenic bacterial strains of methicillin resistant Staphylococcus aureus (MRSA). Total of 280 samples were collected in microbiology laboratory of Sheikh Zayed Hospital, Lahore. Staphyloccus aureus was isolated by using Blood agar, Nutrient agar, Mannitol salt agar, Catalase, Coagulase and Dnase tests. Anti PBP-2a latex agglutination test was used to identify MRSA. Out of 139 Staphylococcus aureus strains isolated from various clinical samples, 43.16% were found to be methicillin resistant. The efficacies of these isolates were tested by paper disc diffusion method on Mueller Hinton agar. All MRSA isolates were resistant to penicillin. Among MRSA isolates, 44.82% were from different inpatient departments, whereas, 40.43% of the MRSA isolates were from outpatients. This preliminary report showed a high prevalence of MRSA in the hospital. To reduce the prevalence of MRSA, regular surveillance of hospital acquired infections is the need of the hour. Keywords: Methicillin resistant, Staphylococcus aureus, Anti PBP-2a, latex agglutination test, Paper disc diffusion method

Abdul Jabbar et al. / International Journal of Advances in Pharmaceutical Research IJAPR Available Online through www.ijapronline.org Research Paper ISSN: 2230 – 7583 PREVALENCE AND ANTIMICROBIAL SUSCEPTIBILITY PATTERN OF METHICILLIN RESISTANT STAPHYLOCOCCUS AUREUS ISOLATES IN LAHORE Abdul Jabbar2 , Saeedullah Khan1, Shahzad Munir2, Najmul Hasan3, Hamid Rasool Niazi2 1 2 Institute of Molecular Biology and Biotechnology, University of Lahore, Pakistan Department of Microbiology, Kohat University of Science and Technology, Kohat, Pakistan 3 Department of Microbiology, University of Karachi, Karachi, Pakistan. Received on 13 – 02 - 2013 Revised on 27 – 03- 2013 Accepted on 21– 04 – 2013 ABSTRACT The emphasis of this study was on the sensitivity of the antibiotics to pathogenic bacterial strains of methicillin resistant Staphylococcus aureus (MRSA). Total of 280 samples were collected in microbiology laboratory of Sheikh Zayed Hospital, Lahore. Staphyloccus aureus was isolated by using Blood agar, Nutrient agar, Mannitol salt agar, Catalase, Coagulase and Dnase tests. Anti PBP-2a latex agglutination test was used to identify MRSA. Out of 139 Staphylococcus aureus strains isolated from various clinical samples, 43.16% were found to be methicillin resistant. The efficacies of these isolates were tested by paper disc diffusion method on Mueller Hinton agar. All MRSA isolates were resistant to penicillin. Among MRSA isolates, 44.82% were from different inpatient departments, whereas, 40.43% of the MRSA isolates were from outpatients. This preliminary report showed a high prevalence of MRSA in the hospital. To reduce the prevalence of MRSA, regular surveillance of hospital acquired infections is the need of the hour. Keywords: Methicillin resistant, Staphylococcus aureus, Anti PBP-2a, latex agglutination test, Paper disc diffusion method INTRODUCTION Staphylococcus aureus has been recognized as the most important virulent and frequently encountered pathogen in clinical practices. It is an endogenous microorganism colonizing the nasal cavity, skin, gastrointestinal, anus and vaginal vulvae of healthy women1. Author for Correspondence Abdul Jabbar, Department of Microbiology, Kohat University of Science and Technology, Kohat, Pakistan. ajswati22@gmail.com Cell # + 92 333 9483707 Fax # +92 91 9211663 IJAPR /June 2013/ Vol. 4 /Issue. 6 / 1810 – 1816 Clinically MRSA is a major healthcare associatedMethicillin Resistant Staphylococcus aureus (HAMRSA) as well as a community associatedMethicillin Resistant Staphylococcus aureus (CAMRSA) infection causing a wide range of diseases, including endocarditis, osteomyelitis, toxic-shock syndrome, pneumonia, food poisoning, impetigo and carbuncles. These infections may occur in wounds or skin, burns and other sites where tubes enter the body, as well as in the eyes, bones, heart and blood2. The proportion of nosocomial infections caused by MRSA augmented strongly, and MRSA is now a leading cause of such infections3. Appearance of MRSA in animals has been shown by previous studies4. Epidemiological studies suggest that hospitals of all sizes are facing the problem of MRSA. The problem occurs to be increasing regardless of hospital size and control measures for MRSA. MRSA has become the commonest hospital 1810 Abdul Jabbar et al. / International Journal of Advances in Pharmaceutical Research acquired infection causing agent throughout the world, causing a wide range of hospital infections5. Resistance to methicillin mediated by mecA gene, responsible for production of PBP2a, which have been observed in MRSA. mecA located on a region of chromosome called SCC mec. Five different types of SCC mec have been characterized as I, II, III, IV, V6. The mecA gene complex also contains insertion sites for plasmids and transposons that facilitate acquisition of resistance to other antibiotics. Thus, cross-resistance to non-β-lactam antibiotics such as erythromycin, clindamycin, gentamicin, cotrimoxazole and ciprofloxacin is common2. The past few decades have seen an alarming increase in the prevalence of antimicrobial resistant pathogens in serious infections7. Increasing resistance to penicillin has led to the development of semi-synthetic groups of penicillin such as methicillin, that are resistant to many genetic variations of the beta-lactamase enzyme. For years, infection by Staphylococcus aureus was controlled using methicillin and its analogues. However, in 1961 the first strain of MRSA was isolated8 since then, MRSA has been found worldwide especially in hospitals and nursing homes9. Hospital-acquired infections due to MRSA have been associated with an increase in length of hospital stays, mortality rates, and health-care costs10. Objectives 1. Isolation and identification of Staphylococcus aureus from different clinical samples. 2. Prevalence of MRSA METHODOLOGY Sample collection and processing A total of 280 samples were collected from different sites including pus, wound swabs, sputum, blood, throat swabs, high vaginal swabs and urine, during the period of May to July 2012, and submitted at microbiology laboratory of Sheikh Zayed Hospital, Lahore. Blood samples were collected in a sterile thioglicolate broth, sputum and urine were collected in sterile containers, pus in sterile syringes while vaginal, throat and wound samples were collected by sterile swabs. Staphylococcus aureus were isolated and identified by growing on Nutrient agar, Blood agar and Mannitol salt agar. These were incubated at 37ºC for 18 to 24 hours and the growth of organisms then confirmed by Gram staining, Catalase test, Coagulase test, Mannitol fermentation test and Dnase test, following standard microbiological procedures11. IDENTIFICATION OF STAPHYLOCOCCI Gram staining IJAPR /June 2013/ Vol. 4 /Issue. 6 / 1810 – 1816 A smear of bacteria was prepared by placing a drop of distilled water on a clean slide to perform Gram staining. Smear was allowed to air-dry and then heat fixed by gliding slide 2-3 times over Bunsen’s burner flame. The smear was stained with crystal violet (primary) for one minute and washed with tap water. Gram’s Iodine (mordant) was added for one minute and washed with tap water. The slides were decolorized with 95% ethanol until no stain came out and washed with tap water. Safranin (counter) solution was added for a half minute and washed with tap water. Stained slides were examined under oil immersion objective (100X) of the bright field compound microscope. Staining character and microscopic morphological appearance of individual bacteria were recorded. Identification of Staphylococcus aureus Catalase test was used for the biochemical identification of this nosocomial pathogen. One drop of 3% hydrogen peroxide was placed on a clean slide. The suspected isolate was picked by using sterile inoculating loop and put into 3% hydrogen peroxide. The presence of bubbles was indicative for positive results11. Coagulase test (Clumping factor) was performed by placing a drop of distilled water on each end of a slide or on two separate slides. Emulsify a colony of the test organism in each of the drops to make thick suspensions. Add a loopfuls of plasma to one of the suspensions, and mixed gently. Look for clumping of the organisms within 10 seconds11. DNase test was carried out by dividing DNase plate into the required numbers of strips by marking the underside of the plates. Using a sterile loop or swab, spot-inoculate the test and control organisms. Incubated the plate at 35-37°C overnight. Covered the surface of the plate with 1mol/hydrochloric acid solution. Tip off the excess acid and looked for clearing around the colonies within 5 minutes of adding the acids11. SCREENING OF MRSA PBP-2a latex agglutination kit MRSA were confirmed by PBP-2a latex agglutination kit (Oxoid). Extraction reagent 1 (four drops) and sufficient bacterial growth (filling 5 μl bacterial loop) were added in an Eppendorf tube to make homogeneous suspension. It was placed in a boiling water bath (over 95 ºC) for three minutes and then allowed to cool at room temperature. Extraction reagent 2 (one drop) was added in the same eppendorf and mixed well. Mixture was centrifuged at 3,000 rpm for five minutes and supernatant was used for the test. Kit is provided with two bottles of latex particles i.e. test latex and control latex. On the test card one drop of test latex and control latex was 1811 Abdul Jabbar et al. / International Journal of Advances in Pharmaceutical Research added to the respective circles. Supernatant was added on test latex and control latex and mixed thoroughly with a separate mixing stick for three minutes and agglutination was noted. Results were interpreted according to following two possibilities. a. Agglutination in test latex but not in control latex within 3 minutes-----MRSA b. Agglutination in neither test latex nor control latex within 3 minutes----MSSA Antimicrobial susceptibility testing Antimicrobial susceptibility was determined by the Disc Diffusion method, referred to the Clinical and Laboratory Standard Institute (CLSI, 2009). The antibiotic discs including Oxacillin (1μg), Penicillin (10μg), Erythromycin (30μg), Gentamycin (10μg), Tetracycline (30μg) amikacin (30μg), Chloramphenicol (30μg), cefotaxime (30μg), vancomycin (10μg) ciprofloxacin (5μg), were placed on the surface of Mueller Hinton agar plates and were incubated for 18 to 24 hours at 37ºC. The antibiogram was read and recorded the diameter of zone of the inhibition. RESULTS Identification of Staphylococci Staphylococci produced characteristic yellow to cream color colonies on blood agar after overnight incubation. Pigments were less pronounced in young colonies. Colonies were slightly raised and easily emulsified. Microscopic study revealed gram positive cocci, occurring characteristically in groups like grapes but also singly and in pairs. These were non motile, non capsulated and appeared blue purple under oil immersion objective (100X) of the bright field compound microscope. Identification of Staphylococcus aureus Catalase test This test was performed to differentiate Staphylococci from Streptococci. Staphylococci produced bubbles and it was concluded that the organism makes catalase. A lack of bubbles indicates the absence of catalase. Coagulase test This was used to identify Staphylococcus aureus. Coagulase enzymes are present in Staphylococcus aureus which convert fibrinogen into fibrin clot while absent in the other species of Staphylococcus. DNase test This test was used to identify Staphylococcus aureus which produces deoxyribonuclease (DNase) enzymes. The clearing around the colonies shows DNase positive strains. Mannitol fermentation test IJAPR /June 2013/ Vol. 4 /Issue. 6 / 1810 – 1816 Staphylococcus aureus ferments mannitol and produced yellow colour 1-2mm in diameter colonies after overnight incubation at 37°C. IDENTIFICATION OF MRSA PBP-2a latex agglutination test This test was used to identify methicillin resistant Staphylococcus aureus (MRSA). Agglutination in test latex but not in control latex within 3 minutes was confirmed as MRSA as shown in figure 1. Isolation of MRSA The isolates were from different parts of the body. Out of 280 samples 139 strains were found as Staphylococcus aureus of which 60 (43.16%) were found to be methicillin resistant MRSA (Table 1). Maximum number of Staphylococcus was found in pus isolates. Out of 32 Staphylococcus aureus 56.25% were MRSA, followed by wound swabs in which 54.54% were MRSA. The prevalence of MRSA and Staphylococcus aureus was higher in Inpatient (Wards and ICU) department as 39 (44.82%) and Staphylococcus aureus was 48 (55.17%) as compared to Outpatient (OPD) department which was 21 (40.38%) and Staphylococcus aureus was 31 (59.61%). Hence, the overall prevalence of MRSA and Stapylococcus auerus was 43.16% and 56.83% respectively as shown in figure 2. Antimicrobial susceptibility pattern All the strains of MRSA were found to be resistant to Penicillin. Among MRSA, resistance to oxacilline was 100%, ciprofloxacin 68.33%, erythromycin 63.33%, gentamicin 51.66%, cefotoxime 100%, Chloromphenicol 38.33%, fusidic acid 45%, amikacin 48.33%, and tetracycline were resistant to 41.66% of the MRSA strains. Many MRSA strains were multidrug resistant shown in table 2. Many of the MRSA strains were resistant to all the antibiotics tested except Vancomycin as shown in figure 3. The diameter for zone of inhibition for test drugs was according to the standard zone of inhibition chart (NCCLS, 2007) as shown in table 2. DISCUSSION Methicillin resistant Staphylococcus aureus (MRSA) is a serious threat to hospitalized patients globally and it now represents a challenge for public health, as community associated infections appear to be on the increase in both adults and children in different regions and countries12. Epidemiological studies suggest that hospitals of all sizes are facing the problem of MRSA. The problem occurs to be increasing regardless of hospital size and control measures for MRSA. Prevalence is constantly mounting in many countries, and in some 1812 Abdul Jabbar et al. / International Journal of Advances in Pharmaceutical Research hospitals, more than half of all Staphylococcus aureus disease isolates are MRSA13. In Pakistan, the prevalence of MRSA was reported up to 42% in 2007 by Ali et al14. In Nepal, Sanjana et al., 201015 founded the prevalence of MRSA 39.6%. Prevalence of MRSA was higher among inpatients (41.1%) than outpatients (37.4%). A comparable prevalence rate of 34.7%, 31.0% and 38.5% were also reported from Assam, Tamil Nadu and Delhi by Rajaduraipandi et al., 200616.These results were consisted with the finding of our results. We found the prevalence rate of methicillin resistance Staphylococcus aureus (MRSA) 43.16%. Prevalence of MRSA was higher among inpatients (44.82%) than outpatients (40.38%) in Shaikh Zayed Hospital, Lahore. In a study by Kumari et al., 200817, in Eastern part of Nepal in Dharan, reported the rate of MRSA was (26.4%), which was low as compared to our finding; this difference could be due to prolonged hospital stay, instrumentation and other invasive procedures. MRSA are often multidrug-resistant. A study form Tehran, Iran by Vadhani et al., 200418 reported that, from the 90 MRSA isolates, approximately half of them displayed resistance to one or more antimicrobial agents, including penicillin, cephalosporins, tetracycline and aminoglycosides. We found multidrug resistant MRSA 61.84%. If we look into the Indian literature, it seems the burden of multidrug resistant MRSA is increasing over time: for instance, 23.2% was reported by Majumder et al., 200119, 32% by Anuparba et al., 200320 and 63.6% by Rajaduraipandi et al., 200616. The lesson is clear, MRSA surveillance and strict drug policy are of more importance or else the threat will increase. Vancomycin seems to be the only antimicrobial agent which showed 100% sensitivity and so may be used as the drug of choice for treating multidrugresistant MRSA infections as we found it in the susceptibility pattern of MRSA. This result is similar with previous studies, as Alborzi et al.,200021, in Shiraz, Iran, reported that, 100 percent of isolates were sensitive to vancomycin and recently in Qassim, Saudi Arabia, Mohammad et al., 201122, reported the similar value. But in Tehran, Vidhani et al., 200418, reported 7% of isolates were resistant to Source Pus Sputum Blood Throat swab Wound swab vancomycin. This report is an early warning that Staphylococcus aureus strains with full resistance to vancomycin might emerge in future because of widespread use of antibiotics and changing trends of defence acquired by MRSA. Gentamycin is an aminoglycoside most often used because of it slow cost and reliable activity against gram positive bacteria. In the present study 51.66% of MRSA showed resistance towards gentamycin which is higher than reported earlier 34% in Islamabad by Yameen et al., 200923. Beta-lactam antibiotics like penicillin and cephalexin were not found to be effective against MRSA. Penicillin and cephalexin resistance were 100% and 88.7% respectively. Resistance to quinolones (ciprofloxacin) was also found to be very high i.e. 84.1%. This correlates with an earlier finding where it has been shown that the resistance to ciprofloxacin is steadily increasing from 39% in 1992 to 68% in 1996 as reported Delhi by Mehta et al., 199824. All these studies were in agreement with this research because we found the resistance pattern of Penicillin 100%. Resistance to quinolones (ciprofloxacin) was also found to be very high i.e. 68.33%. This correlates with an earlier finding where it has been shown 68% by Mehta et al., 199824. This high resistance may due to increases pressure of antibiotics. Vancomycin is not a commonly prescribed drug, which is almost certainly due to the higher price of the antibiotic and its unavailability in many parts of the country. In the study, Penicillin-resistance was observed to be 100% against the organism. This corroborates with the finding of Anupurba et al., 200320. This result is in agreement with our finding, where we found cefotaxime 100% resistance because of the presence of beta lactams ring in this antibiotic. We found such strains of multidrug resistant MRSA with increasing resistance to ciprofloxacin, chloramphenicol, fusidic acid and erythromycin. This is due to high pressure of antibiotics usages. This observation is in agreement with Schito, 200225, in his study of MRSA reported that, MRSA were generally multidrug resistant with increasing resistance to ciprofloxacin, chloramphenicol, fusidic acid and erythromycin. Table 1: Isolation of MRSA (%) from different specimens. Total Staphylococcus aureus MRSA 32 18 20 7 18 3 25 11 22 12 IJAPR /June 2013/ Vol. 4 /Issue. 6 / 1810 – 1816 % 56.25 35 16.16 44 54.54 1813 Abdul Jabbar et al. / International Journal of Advances in Pharmaceutical Research High vaginal swab Urine Total 15 7 139 6 3 60 Table 2: Antimicrobial resistant Pattern of MRSA% Strains. Diameter for sensitive zone of MRSA (%) inhibition 100 >14mm Antibiotics Oxacillin Penicillin >18mm 100 Cefotaxime >23mm 100 Ciprofloxacin Erythromycin Gentamycin Vancomycin 63.33 >23mm 51.66 45 >15mm Chloramphenicol Tetracycline 68.33 >21mm >18mm Fusidic acid Amikacin 40 42 43.16 38.33 >18mm 48.33 >17mm 41.66 >15mm 00 >15mm mm = millimeter Figure 1: Positive PBP-2a Latex agglutination test Figure 2: Percentage of S. aureus and MRSA in inpatient and outpatient department IJAPR /June 2013/ Vol. 4 /Issue. 6 / 1810 – 1816 1814 Abdul Jabbar et al. / International Journal of Advances in Pharmaceutical Research Figure 3: Percentage of resistant pattern of MRSA isolates. CONCLUSION From this study it was concluded that, the prevalence of MRSA is increases amongst clinical isolates of Staphylococcus aureus. Out of 139 Staphylococcus aureus strains isolated from various clinical samples, 60 (43.16%) were found to be MRSA. Among MRSA isolates, 39(44.82%) were from different inpatient departments, whereas, 21(40.43%) of the isolates were from outpatient department. All MRSA were resistant to penicillin. Active screening and compliance with recommended infection control practices play an important role in the control of MRSA. Attention should be paid to stop the transmission of MRSA by health care taker by very careful hand washing. There is a need for surveillance of MRSA and its antimicrobial profile. The hospital infection control policy and guidelines that already exists should be strictly followed so as to enable the clinicians to deliver better and proper health care to the patients. REFERENCES 1. 2. 3. 4. OnanugaA, OyiAR, J. Onaolapo A., Prevalence and susceptibility pattern of Methicillin Resistant Staphylococcus aureus isolates among healthy women in Zaria, Nigeria. Afr. J.Biotechnol 2005, 4, 1321-4. Chambers F., Tracking the spread of CMRSA. APUA. Newsletter (2003) 21, 1-5. 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Singh I., Prevalence of Methicillin-Resistant Staphylococcus aureus (MRSA) in a TertiaryCare Hospital in Eastern Nepal. J Nepal Med Assoc 2008, 47(170), 53-6. VidhaniS, MehndirattaPL, M. Mathur D., Study of Methicillin Resistant Staphylococcus aureus (MRSA) isolates from high risk patients. Indian Journal of Medical Microbiology 2004, 19(2), 13-6. MajumderD, SarmaJN, Phukan AC, Mahanta J., Antimicrobial susceptibility pattern among Methicillin resistant Staphylococcus isolates in Assam. Indian J Med Microbiol 2001, 19(3), 138-140. 20. AnupurbaS, SenMR, Nath G, Sharma BM, Gulati AK,T. Mohapatra M., Prevalence of methicillin resistant Staphylococcus aureus in a tertiary referral hospital in eastern Uttar Pradesh India. J. Med. Microbiol 2003, 21, 49-51. 21. AlborziA, PourabbasB, Pourabbas B, Oboodi B, Panjehshahin M., Prevalence and Pattern of Antibiotic Sensitivity of Methicillin–sensitive and Methicillin- resistant Staph. aureus in Shiraz. Iranian Journal of Medical Sciences 2000, 25 (1-2), 1-8. 22. Mohammad A., Colonization and antibiotic susceptibility pattern of methicillin resistance Staphylococcus aureus (MRSA) among farm animals in Saudi Arabia. Journal of Bacteriology Research 2011, 3(4), 63-8. 23. YameenMA, HinaN, Naeem A, Saira I, Imran J, Abdul H., Antibiotic susceptibility profile of methicillin-resistant Staphylococci isolated from nasal samples of hospitalized patients. African Journal of Microbiology Research 2010, 4(3), 204-9. 24. MehtaM, DuttaP, Gupta V., Bacterial isolates from burn wound infections and their antibiograms: A eight-year study. Indian J Plast Surg 2007, 40, 25–8. 25. G. Schito C., Is antimicrobial resistance also subject to globalization? Clinical Microbiology and Infection 2002, 8(3), 1-8. INTERNATIONAL CONGRESS IN PHARMACY AND HEALTH SCIENCES Pharma Science Tech Association, Foundation No: AP/PSTA/56/2012. Please visit for Details: www.icphsmembership.com Totally three types FICPHS (Fellowship in International Congress in Pharmacy and Health Sciences), MICPHS (Member in International Congress in Pharmacy and Health Sciences), AMICPHS (Associate Member in International Congress in Pharmacy And Health Sciences) Eligibility FICPHS: Ph.D in Chemistry/ Pharmacy / M.Sc / M.Pharm with 2 years experience, MICPHS: M.Sc / M.Pharm (or) B.Sc / B.Pharm with 2 years experience, AMICPHS: B.Sc (or) B.Pharmacy IJAPR /June 2013/ Vol. 4 /Issue. 6 / 1810 – 1816 1816