Arab Journal ofpharmaceutical Sciences
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1 rab Journal ofpharmaceutical Sciences Journal of the Society of rab Universities Refereed Scientific Research Journal Issued by Scientific Society ofcolleges ofpharmacy in the rab World ISSN Thirteen Years
2 rab Journal of Pharmaceutical Sciences Mec and PVL Genes in Methicillin Resistant Staphylococcus aureus from Nasal Carrier Individuals Exposed and Not Exposed to Hospital Environments Hantash bed El-lalil, Raeda Khalil,Muna lallad,muna Bustami, Fuad I-Jawad' and bdul lalil Thwaini" 'Faculty of Pharmacy, "Faculty of Science, Philadelphia University, mman, Jordan "'Faculty of Pharmacy, Petra University, mman, Jordan. bstract Exposure to hospital environments of limited duration did not cause an increase in the nasal carriage of Staphylococcus aureus whether they are methicillin resistant or sensitive. 6% of MRS isolated were resistant to erythromycin and lincomycin and more than 0% of those are resistant to gentamicin as well. No vancomycin resistance was encountered. Resistance to other anti-microbials was uncommon among MRS. One MRS strain possessed the pvl but not mec gene. ll other mec positive strains did not have the pvl gene. Key words: nasal carriage, methicillin resistant Staphylococcus aureus (MRS), methicillin sensitive staphyloccus aureus (MSS), mec gene, pvl gene. Introduction hospital environments may be one ofthese was Most strains of Staphylococcus aureus, even explored. MRS strains were tested for both those acquired in the community are penicillin mec and pvl genes. resistant. In most cases the resistance is attributable to B-lactamase production due to a Materials and Methods plasmid or chromosomal gene. Some Subjects: staphylococci that are penicillin resistant are One hundred and seventy three third and fourth also resistant to the newer B-lactamase year students of the College of Nursing, resistant semi-synthetic penicillins such as Philadelphia University, mman, Jordan were methicillin,oxacillin and nafcillin. This included in the study. ll students have had resistance is due primarily to the presence of several six weeks sessions in various hospital an unusual penicillin binding protein in the cell departments. They represented the group wall of resistant strains (I ). exposed to hospital environments. Similarly, Clinically significant methicillin resistant 178 age matched third and fourth year students Staphylococcus aureus (MRS) is being of the College of Pharmacy of the same isolated with greater frequency in many university were studied. Those represented the countries,often pausing problems as causes of group not exposed to hospital environments. nosocomial infections. Infections by these Both sexes were represented in the two groups. strains significantly affect patient,s morbidity. None of the students had a medical history, an Infection with MRS is likely to be more infection or treatment with an antibiotic in the severe a and requires longer hospitalization (2) last six months. ll students consented to Since nasal carriage of MRS plays a key role participation in the study. in the epidemiology and pathogenesis of Nasal Swabs: community associated disease(3, 4), this study swab from both anterior nares was obtained was conducted to investigate this phenomenon from each student. Swabs were carefully in two groups of healthy young adults. Risk inserted into each nostril so that the tip is factors for nasal carriage of MRS are poorly entirely at the nasal osteum level (about 2. understood. The possibility that exposure to v
3 Cm. from the edge of the nare) and gently rolled times. Mec and PVL Genes in Methicilli manufacturer's instructions. The concentration of DN was estimated spectrophotometrically. T Culture and Identification: Swabs were immediately plated on mannitolsalt agar and cultured on brain heart infusion broth for enrichment. Subcultures were made from the broth to mannitol salt agar after hours. Inoculated mannitol salt agar plates were incubated at 3 C. for n hrs. Mannitol fennenting colonies were examined by Gram stain and tested for catalase production. Subcultures on nutrient agar slants were made and tested further for DN-ase production and production of Coagulase and possession of protein using Staph-Latex kit (Plasmatec Laboratory Products Limited, Dorset, U.K.). Strains positive by these tests were labeled as Staphylococcus aureus and slants were kept for further study. Screen test for MRS: suspension equivalent to Mac Farland 0. was prepared from each strain. swab was dipped and streaked over an area of approximately 2x2. Cm. on the surface of a Mueller-Hinton agar supplemented with 4% NaCI and 6 mcglml Oxacillin (Sigma-ldrich). Plates were incubated at 30 e. for 3 days. growth indicates that the strain is oxacillin resistant. Sensitivity to other antibiotics: Mueller-Hinton agar plate was inoculated with a swab dipped in a suspension of each strain equivalent to Mac Farland 0.. Sensitivity discs of penicillin, tetracycline, erythromycin, lincomycin, gentamicin, vancomycin, ciprofloxacin and trimethoprim sulfamethaxasole were used. The disc contents and zones of inhibition were as recommended by the Clinical Laboratory Standards Institute (CLSI),fonnerly National Committee for Clinical Laboratory Standards. Molecular nalysis: Genomic DN extraction: Strains were grown on brain heart infusion broth at 37 e. overnight. DN was extracted by DN purification kit (Promega, US) according to the PCR Detection of the mec Gene The mec gene was detected by PCR as described by Gamier et. al () using pmol/ul of each mec p4 and mec p7 primers (6,7 and 8) purchased from invitrogen (U.S..). DN of mec positive S. aureus strain (TCC 4300) and a negative PCR blank control with nuclease free water instead of DN were included with each set of reactions to identify false positive results. DN was amplified in a MJ Mini personal thennal cycler (Bio Rad, U.S..) with Hot STRT Master Mix as recommended by the manufacturer (GENEXPLORER). The following profiling cycle was used: predenatureation at 94 e. for min. followed by 3 cycles of 30sec. at 94 e.,30 sec. at 3 e.,60 sec. at n e. and a final extension for min. at noc. The 162 bp PCR products were detected in 1.% agarose gel (Promega.LE, U.S..). Band size was assessed by direct comparison with a 100-bp PCR DN marker (Promega, U.S..). PCR detection of leukocidin gene (pv/ gene) The pvl (luks-pv-lukf-pv) gene was detected as previously described (9 and 10) using pmol/ul of each pvl-i and pvl-2 primers (Invitrogen, U.S..). DN of positive pvl I strain ( TCC 4977) and a negative PCR blank control with nuclease free water instead of DN were included with each set of reactions to identify false positive PCR results. PCR condition was predenaturing at 94 C for minutes, followed by 3 cycles of 30 seconds at 94 C, 30 seconds at 7 C, 30 seconds at noc, and a final extension of munutes at noc. The 433 PCR products were detected in 1.% agarose gel. Results The nasal carrier rate of both groups, the incidence of methicillin resistance and the possession of mec gene is shown in table I. The table shows that nursing students do not show a higher carrier rate of Staphylococcus aureus but although the number is small, the rate VI T o tv1 tv1 (F ci: 01 th re eji g~ RI lu1 at TI re all G S~ va M M pc; nc; w, M D N di ar m he ar m TI oj ac el JI,
4 ~illi IOn ly. as /ul,7..). in k of ts. lal ot he be ~d: ed at or re E, et ~er ) d rs I R d s. is t t II e e t S 9 rab Journal of Pharmaceutical Sciences Table I: Nasal carrier rate, incidence of methicillin resistance and possession of mec gene. Group Nursing Students Pharmacy Students Total Number Number Positive (%) Number Resistant (%) mec gene Positive (9%) 6 (38%) (11%) 10 (33%) 9 Table-II: Resistance among MRS and MSS to antibiotics. Total Number Resistant to Organism P T Eryth. Linco. Gent. V SXT Cipro. MRS (16) MSS (30) (P=penieillin, T=tetraeyeline, E=Erythromyein, Line=Lineomyein, Gent=Gentamycin, V=Vancomycin, Cip= ciprofloxacin, SXT=Trimethoprim-sulfamethaxosole) of methicillin resistance is slightly higher in this group. ll strains labeled as methicillin resistant by the method used had mec gene except one. It was this strain which had the pvl gene. Resistance to other antibiotics among MRS and methicillin sensitive Staphylococcus aureus (MSS) is shown in table II. The table shows that 6% of MRS are resistant to both erythromycin and lincomycin and more than 0% of those are resistant to Gentamicin. Resistance to Ciprofloxacin and Septrin was uncommon. No resistance to vancoycin was encountered. Resistance among MSS to antibiotics was less common than MRS. lmost 97%of MSS are resistant to penicillin. ll mec positive strains were negative to pvl gene. The only strain which was pvl positive was the strain labeled as MRS but was mec negative. Discussion Nasal carriage of MRS or MSS varies in different geographical areas (2, 10, 11, 12, and 13). While the prevalence of carriage of methicillin resistance is high and increasing in hospital environments (11) it is rather low among strains colonizing young and healthy members ofthe community (13). The present study shows that the carriage rate of both MRS and MSS in young healthy adults whether exposed to hospital environments or not is lower than that ree-orted by I-Zu'bi et al. (14). Exposure to hospital environments may not have been long enough to show an increase in the carrier rate since it is known that exposure to hospital environment causes an increase (11). Nevertheless, the carrier rate of MRS in nursing students (38%) is a little higher than that of pharmacy students (33%). The prevalence of MRS in some countries is still low. In the Netherlands for example, it is as low as 1% (21). One strain which was Oxacillin resistant by the method used did not possess the mec gene. The resistance mechanism in this strain may either be due to hyperproduction of ~ lactamase or the presence of penicillin binding proteins not related to 2a or 2' (16). It is interesting that this was the only strain which was pvl gene positive. The pvl gene is a stable marker of most community associated MRS (18). Such strains are associated with skin infections like furuncles and with necrotizing pneumonia (19). No Vancomycin resistance was encountered. This agrees with a previous study (1) which did not find vancomycin resistance in clinical isolates or nasal carriers of MRS. Resistance to other antibiotics (Erythromycin, Lincomycin and Gentamicin) was more common in MRS than MSS. Cephalosporins were not included in sensitivity tests since ~-lactam antibiotics are clinically ineffective for treatment of MRS even if they show in vitro sensitivity. VII
5 Study of nasal carriage of MRS is important to the community since it plays a key role in epidemiology and pathogenesis of community associated disease (3 and 4) Risk factors for C-MRS carriage are not understood. Some studies have suggested that recent antimicrobial drug use plays a role in C-MRS colonization (20, 21). This study does not confirm this hypothesis since none of the students has had recent anti-microbial therapy. Study of C-MRS continues to be important. Transmission of infections caused by these strains is readily established by close contact (22). Furthermore, transmission from humans to animals (23) or from animals to man (24) may further complicate the epidemiology of these organisms. References I-Chambers H.F. Methicillin resistant staphylococci: molecular and biochemical basis and clinical implications. Clin. Microbiol. Rev. 10: 9-98, Madani T.; I-bdulla ; I-Sanousi T.M; Ghabrah S.Z. fandi and Bajjunid H. in two tertiary care centres in Jeddah, Saudi rabia. Infect. Control Hosp. Epidemiol. 22: , Pan E.S; Diep B.; Charlebois ED; verswald C; Carleton H.. and Sensabaugh G.F. Population dynamics of nasal strains of methicillin resistant Staphylococcus aureus and their relation to community associated disease activity. J. Infect. Dis; 192: , Lo W.T; Lin W.J; Tseng M.H; Wang S.R; Chu M.L. and Wang e.e. Community acquired methicillin resistant Staphylococcus aureus in children, Taiwan. Emerg. Infect. Dis. 12: , Gamier F; Tristan ; Francois B; Etienne J; Delage-Corre M; Martin C; Liassine N; Wannet W; Denis F. and Ploy M.e. Pneumonia and new methicillin resistant clone. Emerg Infect Dis. 12; , VIII Mec and PVL Genes in Methicilli ~ 6-lto T; Katayama Y; sada K; Mori N; ( Tsutsumimoto K; Tiensasitom e. and o Hiramatsu K. L Structural comparison of three types of 14 staphylococcal cassette chromosome mec ( integrated in the chromosome in methicillin P resistant Staphylococcus aureus. a ntimicrob. gents Chemother. 4; 1323 y 1336,2001. c 7-lto T; Katayama Y. and Hiramatsu K. Cloning and nucleotide sequence 1 determination of the entire mec DN of pre methicillin-resistant Staphylococcus aureus N31. ntimicrob. gents Chemother. 43; 1449 P c 148, liveira D.C; Tomasz and de Lencastre H. 2 The evolution of pandemic clones of 16 methicillin resistant Staphylococcus aureus: t. identification of two ancestral genetic I'l backgrounds and the associated mec d elements. S Microb Drug Resist. 7; , Jarraud S; Mougel C; Thioulouse J; Lina G;, 1 Meugnier H; Forey F; Nesme X; Etienne J; 17 and Vandenesch F. p Relationship between Staphylococcus aureus t. genetic background,virulence factors,agr it groups (alleles), and human disease. lj Infect Immun. 70; , IS; ]0-Tristan ; Ying L; Bes M; Etienne J; 111 Vandenesch F. and Lina G. Ii Use of multiplex PCR to identify Staphylococcus aureus adhesions involved in ~ human hematogenous infections. ~ J Clin. Microbiol. 41; , I~ ll-budu L; Blair I; Fraise and Cheng K. K. <l (MRS): a community based prevalence survey. Epidemiol. Infect. 126: 31-36, lghaithi ; Bilal N.E; Gedebou M. and Weily.H. Nasal carriage and antibiotic resistance of Staphylococcus aureus isolates from hospital and non-hospital personnel in bha,saudi rabia. Trans, R. Soc. Trop. Med. Hyg. 94: 04-07,.,.,' ;\ raja G.F. and Kanj S.S.
6 hicilli i N; and s of mec illin 23 ence prereus 49 H. of eus: etic mec ig; e J; eus lagr ~ J; tify jin... us ice rab Journal of Pharmaceutical Sciences Current status and changing trends of anti microbial resistance in Lebanon. Leb. Med. J. 48: , Sa-Leao R; Sanches LS; Couto I; lves e.r. and de Lencaster H. Prevalence of methicillin resistant strains among Staphylococcus aureus colonizing young and healthy members of the community in Portugal. Microb. Drug Resisr. 7: , I-Zu'bi Enas, Bdour Salwa and Shehabi ntibiotic resistance patterns of mec positive Staphylococcus aureus isolates from clinical specimens and nasal carriage. Microbial Drug Resistance, 10: , De Lencaster H. et al. Multiple mechanisms of methicillin resistance and improved methods for detection in clinical isolates of Staphylococcus aureus. ntimicrob. gents Chemother. 3; , Lytkainen 0; Degener le; Schrijnemakers P. and Bruisma N. in Europe, Emerg. Infect. Dis; 10: , Lina G; Piemont Y; Godail Gamot F; Bes M; Peter M.O. and Gauduchon V. Involvement of Panton-Valentine Leukocidin producing Staphylococcus aureus in primary skin infections and pneumonia. Clin. Infect. Dis. 29: , Vandenesch F; Naimi T; Enright M.C; Lina G; Nimmo G.R. and Hefferman H. Community acquired methicillin resistant Staphylococcus aureus carrying Panton Valentine Leukocidin genes. Emerg. Infect. Dis; 9: , Bagget H.C; Hennesy T.W; Rudolph K; Bruden D; Reosonover. and Parkinson. Communityu onset methicill in resistant Staphylococcus aureus associated with antibiotic use and the cytotoxin Panton Valentine leukocidin during a furunculosis outbreak in rural laska. J. Infect. Dis. 189: , Ellis M.W; Hospenthal D.R; Dooley D.P; Gray P.J. and Murray e.k. Natural history of community acquired methicillin resistant Staphylococcus aureus colonization and infection in soldiers. Clin. Infect. Dis. 39: , Xander W. Huijsdens, ns M.e. van Lier, Eric van Kregten, Liesbeth-Verhoef, Marga G. van Santen-Verheuvel, Emile Spalburg and Wim J.B. Wannet. in Dutch soccer team. Emerg. Infect. Dis. 12: , Seguin J.C; Walker R; Caron J.P; Kloos W.E; George e.g. and Hollis RJ. outbreak in a veterinary teaching hospital: potential human to animal transmission. J. Clin. Microbiol; 37: , Juhasz-Kaszanyitzky E; Szilard J; Somogyi P; Dan ; van der Graaf-van Bloois L; van Duijkeren E; and Wagenaar J.. MRS transmission between cows and humans. Emerg. Infect. Dis; 13: , d of tal ~di 09 IX
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Original Research Article DOI: 10.18231/2394-5478.2017.0098 Prevalence and factors associated with the nasal colonization of Staphylococcus aureus and Methicillin-Resistant Staphylococcus aureus among
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