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  IN THIS Article
 ::  Abstract
 ::  Introduction
 ::  Methods
 ::  Results
 ::  Discussion
 ::  References
 ::  Article Tables

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Year : 1996  |  Volume : 42  |  Issue : 1  |  Page : 1-3

A pilot programme of MRSA surveillance in India. (MRSA Surveillance Study Group).


PD Hinduja Hospital and Medical Research Centre, Bombay.,

Correspondence Address:
A A Mehta
PD Hinduja Hospital and Medical Research Centre, Bombay.

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PMID: 0009715287

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 :: Abstract 

This surveillance study was conducted simultaneously at three centres across India. A total of 13,610 test samples from various sites were obtained. Microbiological methods employed were similar at the three centres. Identification of S aureus was based on the recognition of the production of coagulase with positive isolates being recorded as S aureus. Both tube coagulase tests and slide coagulase test were performed. Antimicrobial susceptibility testing of the isolated strains of staphylococcus aureus and staphylococcus epidermidis to various antimicrobial discs were carried out according to standardized disk diffusion method recommended by NCCLS. Of the total 739 cultures of S aureus, 235 (32%) were found to be multiply resistant with the individual figures for resistance being 27% (Bombay), 42.5% (Delhi) and 47% (Bangalore). MRSA is emerging to be a significant problem pathogen in the surgical setting with vancomycin probably the only reliable choice for these infections.


Keywords: Cross Infection, drug therapy,epidemiology,microbiology,Human, Incidence, India, epidemiology,Infection Control, Methicillin Resistance, Microbial Sensitivity Tests, Pilot Projects, Population Surveillance, methods,Staphylococcal Infections, drug therapy,epidemiology,microbiology,Staphylococcus aureus,


How to cite this article:
Mehta A A, Rodrigues C C, Kumar R R, Rattan A A, Sridhar H H, Mattoo V V, Ginde V V. A pilot programme of MRSA surveillance in India. (MRSA Surveillance Study Group). J Postgrad Med 1996;42:1-3

How to cite this URL:
Mehta A A, Rodrigues C C, Kumar R R, Rattan A A, Sridhar H H, Mattoo V V, Ginde V V. A pilot programme of MRSA surveillance in India. (MRSA Surveillance Study Group). J Postgrad Med [serial online] 1996 [cited 2014 Oct 23];42:1-3. Available from: http://www.jpgmonline.com/text.asp?1996/42/1/1/468





  ::   Introduction Top


Staphylococcus aureus in the most frequently isolated gram-positive pathogen and is increasingly implicated as a cause of nosocomial infections world wide[1]. Recent increase of methicillin-resistant and multiple-resistant strains at large hospitals started to pose great difficulty in selecting antimicrobial agents for the management of the infections they cause. Cephalosporins and other beta-lactam antibiotics have been shown to be clinically ineffective even though certain in vitro tests such as the standard disk diffusion test would suggest that the strains are susceptible[2]. Heterogeneous resistance to the beta-lactam antibiotics and cephalosporins is also responsible for the problems encountered in detecting MRSA[3],[4]. Resistance to erythromycin, clindamycin, tetracycline, aminoglycosides, and chloramphenicol has also been reported with MRSA strains[3],[4]. This intractable difficulty in the detection of staphylococcal resistance to beta-lactam antibiotics has resulted in the adoption of carefully defined laboratory test procedures directed towards providing the clinical microbiology laboratory the ability to detect and accurately assess the antibiotic susceptibility of methicillin-resistant staphylococci[2]. In India, there have been reports of MRSA from different institutes. However, to the best of our knowledge, this is the first surveillance programme using the same methodology, in different centres. Spread well over the country. The present investigation was carried out as a pilot to find out the incidence of MRSA in Indian hospitals and to compare the antimicrobial activity of currently available antibiotics including vancomycin against Staphylococcus aureus.


  ::   Methods Top


Samples

The study was conducted over a 6 month period beginning September 1994 in Ail India Institute of Medical Sciences. New Delhi, PD Hinduja National Hospital and Medical Research Centre, Mumbai and Kidwai Memorial Institute of Oncology, Bangalore. A total of 13,610 samples from variety of sources such as wound swabs, arterial and central line lips, catheter tips, blood, pus and respiratory tract were received during the study period. Only the first isolates from the patients were considered for screening.

Isolation

Specimens were cultured according to standard practice appropriate to the type of specimen. Positive cultures showing gross morphology consistent with staphylococci were Gram - stained and observed microscopically for clusters of Gram-positive cocci Identification of S aureus was based on the recognition of the production of coagulase. Coagulase positive isolates were recorded as S aureus. Both tube coagulase tests and slide coagulase test were performed.

Antimicrobial susceptibility Testing

Antimicrobial susceptibility testing of the isolated strains of staphylococcus aureus and  Staphylococcus epidermidis Scientific Name Search arious antimicrobial discs were carried out according to standardised disk diffusion method recommended by National Committee for Laboratory Standards, M2-A5, 1993[6]. Mueller-Hinton Agar plates (pH 7.2-7.4) were uniformly surface inoculated by cotton swab lightly saturated from a suspension of visual equivalence to the 0.5 Macfariand nephelometric. Within 5 to 20 minutes, the standard antibiotics disks were applied to the agar surface at least 24 mm apart. These plates were incubated at 35?C for 24 hours. Zone diameters to the nearest milli meters were measured and recorded. For disk susceptibility testing methicillin/oxacillin, amoxicillin/clavulanic acid, cefazolin, cefotaxime, gentamicin, netilmicin, tobramycin, amikacin, cefoperazone, cefaclor, lincomycin, ciprofloxacin, rifampicin and vancomycin were the antibacterials tested.


  ::   Results Top


Isolation

Out of the total 13,610 samples received in the three participating centres, 739 Staphylococci were isolated [Table - 1] Out of these 739 staphylococcal isolates 235 (31.8%) were methicillin resistant. In Mumbai, out of 516 Staphylococci 137 (26.6%) were methicillin resistant. The centre in Bangalore showed 33 (47.1%) methicillin resistant strains out of 70 Staphylococci isolated and the centre in New Delhi isolated 65 (42.5%) methicillin resistant strains from 153 Staphylococci.


  ::   Discussion Top


MRSA now accounts for an important cause of nosocomial infections. MRSA and MSSA are equally pathogenic and are capable of causing the same spectrum of nosocomial infection[7],[8]. The major determinant of MRSA resistance to beta-lactam antibiotics is chromosomally mediated and involves production of an unusually low affinity penicillin binding proteins PBP-2a or PBP 2[2],[9]. Most strains of MRSA produce beta-lactamase, but it does not appear to contribute significantly to their level of resistance to methicillin or oxacillin. Most strains are heterogeneously resistant to methicillin, oxacillin, and the cephalosporins[10]. This unusual form of resistance is resistance for many problems that clinical microbiology laboratories encounter in detecting MRSA[11].

Our study revealed that, overall the rate of methicillin-resistance among large hospitals in India with S aureus is nearly 32%. Similar data reported in other studies over the world in tertiary care centres[12],[13] support this high incidence found in our study. In Bangalore, the incidence was highest i.e. 47.1% perhaps because it is an oncology hospital and use of antibacterials is more frequent.

MRSA is resistant to all the beta- lactam antibacterials, as well as to the cephalosporins despite the fact that standard disk susceptibility testing may indicate sensitivity to cephalosporin drugs[9]. Boyce[2] also suggests that Staphylococci that are resistant to methicillin, oxacillin and naficillin should also be considered resistant to cephalosporins.

In our study, MRSA showed 100% susceptibility to vancomycin. To date and for the past 35 years all strains of MRSA are uniformly susceptible to vancomycin and our study confirms this finding.

Rifampicin and lincomycin showed 78% and 70% sensitivity respectively whereas all other antibacterials tested showed variable sensitivity pattern from 0 to 50%. Ciprofloxacin showed 44% susceptibility in the present study. Several quinolone antimicrobials have good antistaphylococcal activity in vitro. Ciprofloxacin has been most widely used in MRSA infections in the past, but a high level of ciprofloxacin resistance has emerged very rapidly after introduction of the agent into general use[14],[15]. Chambers[3] and Lyon et al[4] have also shown that the majority of strains are also resistant to erythromycin, clindamycin, tetracycline and aminoglycosides. If this is so, then vancomycin is the drug of first and the only choice in the management of MRSA infections.

Prevention of MRSA infections merit discussion as once introduced in a hospital MRSA is very difficult to eradicate[16]. After introduction within hospital, MRSA spreads rapidly by hands of medical personnel. Colonized employees of the hospital such as asymptomatic nasal carriers and infected patients acting as reservoirs are important sources in the spread of this organism[12],[17]. Multiple, prolonged use of antibiotics and prolonged hospitalisation are other important factors which make hospitals an ideal place for transmission and perpetuation of MRSA.

The resistance of MRSA to a wide range of antibacterials is well documented. This makes the empirical use of antibacterials effective against M RSA imperative. Vancomycin has been clearly shown to be the drug of choice for the treatment of MRSA infections.

The present MRSA surveillance programme has given a result, which is consistent in all three centres well spread across the country as well as consistent with data published elsewhere in the world. Similar programmes are necessary to monitor the future trend of MRSA.

 
 :: References Top

1. Haley RW. Methicillin - resistant Staphylococcus aureus. Do we just have to five with it? Ann Intern Med 1991; 114:162-164.  Back to cited text no. 1    
2.Boyce JM. Methicillin - Resistant Staphylococcus aureus. Detection, Epidemiology, and Control Measures, Infectious Disease Clinics of North America. Vol. 3, December 1989; 4:911-913.  Back to cited text no. 2    
3.Chambers HF. Methicillin - resistant staphylococci. Clin Microbiol Rev 1988; 1:173-186.  Back to cited text no. 3    
4.Lyon BR, Skurray R. Antimicrobial resistance of Staphylococcus aureus: Genetic basis. Microbiol Rev 1987; 51:88-134.  Back to cited text no. 4    
5.Boyce JM, Lytie LS, Walsh DA. Detection of methicillin resistant Staphylococcus aureus by microdilution and disk dilution susceptibility systems. J Clin Microbiol 1984; 20:1068-1075.  Back to cited text no. 5    
6.NCCLS Document M2 - AS, Performance Standards for Antimicrobial Disk NCCLS Document M2 AS. Performance Standards for Antimicrobial Susceptibility Tests - fifth Edition; approved Standard. December 1993; 13:24.  Back to cited text no. 6    
7.French GL, Cheng AFB, Ling JML, Mo P, Donnan S. Hong Kong strains of methicillin -resistant and methicillin - sensitive Staphylococcus aureus, have similar virulence. J Hosp Infect 1991; 15:117-125.  Back to cited text no. 7    
8.Keane CT, Coleman DC, Cafterkey MT. Methicillin-resistant Staphylococcus aureus - a reappraisal, J Hospital Infection 1991; 19:147-152.  Back to cited text no. 8    
9.Locksley RM. Staphylococcal infections in Harrisons Principles of Internal Medicine, Thirteenth ed. 1994; 1:611-613.  Back to cited text no. 9    
10.Boyce JM, Medeiros AA. Role of B - lactamase in expression of resistance by methicillin - resistant staphylococcus aureus. A resistance by methicillin - resistant staphylococcus aureus. Antimicrob Agents Chemother 1987; 31:1426-1428.  Back to cited text no. 10    
11.Hansen SL, Freedy PK. Variation in the abilities of automated, commercial, and reference methods to detect methicillin resistant (hetero resistant) Staphylococcus aureus. J Clin Microbiol 1984; 20:494-494.  Back to cited text no. 11    
12.Thompson RL, Cabezuclo I. Werizel RP. Epidemiology of nosocomial infections caused by methicillin - resistant staphylococcus aureus infections caused by methicillin -resistant staphylococcus aureus. Ann Intern Med 1982; 97:309-317  Back to cited text no. 12    
13.Cafterkey MT, Hone R, Keane CT. Antimicrobial Chemotherapy of Septicaemia due to Methicillin - Resistant Staphylococcus aureus. Antimicrob Agents Chemother 1985, pp 819-823.  Back to cited text no. 13    
14.Daum TE, Schaberg DR, Terpenning MS, Sottile WS, Kauftman CA. Increasing resistance of staphylococcus aureus to ciprofloxacin. Antimicrob Agents Chemother 1990; 34:1862-1863.  Back to cited text no. 14    
15.Shalit I, Berger SA, Gorea A, Frimerman H. Widespread quinolone resistance among methicillin - resistant Staphylococcus aureus resistance among methicillin -resistant Staphylococcus aureus isolates in a general hospital. Antimicrob Agents Chemother 1989; 33:593-594.  Back to cited text no. 15    
16.Arbuthnott JP, Coleman DC, DeAsavedo JS. Staphylococcal toxins in human disease. J Appl Bact 1990; 69(Suppl):101-7S.  Back to cited text no. 16    
17.Locksley RM, Cohen ML, Quinn TC. Multiple antibiotic - resistant staphylococcus aureug Introduction, transmission, and evolution of nosocomial infection. Ann Intern Med 1982; 97:317-324.   Back to cited text no. 17    


    Tables

[Table - 1], [Table - 2]

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2004 - Journal of Postgraduate Medicine
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