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Brazilian Journal of Microbiology

Print version ISSN 1517-8382On-line version ISSN 1678-4405

Braz. J. Microbiol. vol.35 no.1-2 São Paulo Jan./June 2004

http://dx.doi.org/10.1590/S1517-83822004000100005 

MEDICAL MICROBIOLOGY

 

The effectiveness of alcohol gel and other hand-cleansing agents against important nosocomial pathogens

 

Eficácia do álcool gel e outros agentes degermantes na remoção de importantes patógenos hospitalares aplicados artificialmente nas mãos

 

 

Silvio Evandro Daniel HernandesI; Aline Cláudia de MelloII; Janete Jordão Sant'AnaIII; Vanessa Sarto SoaresI; Valdir CassiolatoIII; Lourdes Botelho GarciaII; Celso Luíz CardosoII

 

IDepartamento de Medicina, Universidade Estadual de Maringá, Maringá, PR, Brasil
IIDepartamento de Análises Clínicas, Universidade Estadual de Maringá, Maringá, PR, Brasil
IIIDepartamento Enfermagem, Universidade Estadual de Maringá, Maringá, PR, Brasil

Correspondence

 

 


ABSTRACT

We compared the effectiveness of alcohol gel with that of the traditional hand-cleansing agents in removing clinical strains of Acinetobacter baumannii, methicillin-resistant Staphylococcus aureus, Escherichia coli, Enterococcus faecalis, Pseudomonas aeruginosa, and Candida albicans from artificially contaminated hands. The fingertips of 6 volunteers were contaminated with approximately 106 of microbial cells, and then were washed with: plain liquid soap, alcohol gel, 70% ethyl alcohol (by weight), 10% povidone-iodine liquid soap (PVP-I), and 4% chlorhexidine gluconate detergent. The experiments were performed using a Latin square statistical design, with six 6 x 5 randomized blocks, and the results were estimated by ANOVA. The products reduced from 93.83% (plain liquid soap) to 100% (PVP-I) of the microbial population applied to the hands. In 4 of 6 test microorganisms analyzed, 10% PVP-I, alcohol gel, 70% ethyl alcohol, and 4% chlorhexidine had significantly higher removal rates than plain liquid soap (P < 0.05). The results confirm the effectiveness of alcohol gel for hand hygiene and suggest that 10% PVP-I, alcohol gel, 70% ethyl alcohol, and 4% chlorhexidine may be more effective than plain liquid soap for removing A. baumannii, E. coli, E. faecalis, and C. albicans strains from heavily contaminated hands.

Key words: alcohol gel, hand-cleansing agents, nosocomial pathogens.


RESUMO

Nós comparamos a eficácia do álcool gel com a dos tradicionais agentes degermantes preconizados para a lavagem das mãos na remoção de amostras clínicas de Acinetobacter baumannii, Staphylococcus aureus resistente a meticilina, Escherichia coli, Enterococcus faecalis, Pseudomonas aeruginosa e Candida albicans das mãos artificialmente contaminadas. As pontas dos dedos dos voluntários (n=6) foram contaminadas com aproximadamente 106 de células/microrganismo teste. A seguir, as mãos foram lavadas com sabonete líquido não medicamentoso, álcool gel, álcool etílico 70% (concentração por peso) e soluções anti-sépticas detergentes de polivinilpirrolidona-iodo a 10% (PVP-I) e de gluconato de clorhexidina 4%. Os experimentos foram realizados segundo um quadrado latino com seis blocos aleatorizados 6 x 5. Os resultados foram estimados por ANOVA. Os produtos reduziram de 93,83% (sabão líquido) a 100% (PVP-I 10%) a população microbiana aplicada nas mãos. Em 4 dos 6 microrganismos testes analisados, o PVP-I 10%, o álcool gel, o álcool etílico 70% e a clorhexidina 4% mostraram uma taxa de remoção significantemente superior a do sabão líquido (P < 0,05). Os resultados confirmam a eficácia do álcool gel na higienização das mãos e sugerem que o PVP-I 10%, o álcool gel, o álcool etílico 70% e a clorhexidina 4% podem ser os agentes mais eficazes do que o sabão líquido não medicamentoso na remoção de Acinetobacter baumannii, Escherichia coli, Enterococcus faecalis e Candida albicans das mãos altamente contaminadas.

Palavras-chave: álcool gel, lavagem de mãos, patógenos hospitalares.


 

 

INTRODUCTION

Ethyl alcohol is recommended in hospital practice in Brazil for hygienic handwashing because of its effectiveness and low cost (8). The major disadvantage of alcohol for skin antisepsis is its drying effect (21). In recent years, some commercial preparations containing 60% to 70% ethanol or isopropyl alcohol with addition of emollients to minimize skin drying (alcohol gel) have appeared in foreign markets. The effectiveness and acceptance of these products have been confirmed by investigators outside Brazil (20,28,36).

In the present study we compared the effectiveness of alcohol gel with that of the traditional hand-cleansing agents in removing clinical microbial strains of Acinetobacter baumannii, methicillin-resistant Staphylococcus aureus, Escherichia coli, Enterococcus faecalis, Pseudomonas aeruginosa, and Candida albicans from artificially contaminated hands of human volunteers.

 

MATERIALS AND METHODS

Test organisms

The following test organisms were used: A. baumannii (1st block), methicillin-resistant S. aureus (2nd block), E. coli (3rd block), E. faecalis (4th block), P. aeruginosa (5th block), and C. albicans (6th block). All the test organisms were isolated from patients at the University Hospital, a 95-bed teaching hospital (Universidade Estadual de Maringá, Maringá, Paraná, Brazil), and were identified by routine tests performed at the hospital's microbiology laboratory (19,27).

Culture media

The following culture media were used: (i) MacConkey agar to recover A. baumannii and E. coli; (ii) tryptic soy agar containing 4 µg/mL of oxacillin (Bristol-Myers-Squibb Brasil Ltda., Santo Amaro, state of São Paulo, Brazil) to recover methicillin-resistant S. aureus, E. faecalis, and P. aeruginosa; (iii) Sabouraud dextrose agar containing 50 µg/mL of chloramphenicol (Carlo Erba, Duque de Caxias, state of Rio de Janeiro, Brazil) to recover C. albicans. All these media were purchased from Difco (Difco Laboratories, Detroit, Michigan, USA).

Volunteers

The volunteers were six healthy adults, three males and three females, with no skin problems. Their ages ranged from 20 to 23 years. As a control, before and after each experiment the fingertips of the volunteers were sampled by the finger-streak technique (4), with culturing for the presence of each test microorganism.

Hand-cleansing agents

The following hand-cleansing agents were used: (i) plain liquid soap (Cera Ingleza Indústria e Comércio Ltda., Belo Horizonte, state of Minas Gerais, Brazil); (ii) alcohol gel _ ethyl alcohol plus emollient (Geef Ltda., São Paulo, São Paulo, Brazil); (iii) 70% ethyl alcohol, prepared at the moment of use by mixing 70 g absolute ethyl alcohol (Merck S. A. Indústria Química, Rio de Janeiro, Rio de Janeiro, Brazil) and 30 g distilled water; (iv) 10% povidone-iodine detergent, containing 1% active iodine; (v) 4% chlorhexidine gluconate detergent, containing 4% isopropyl alcohol. The latter two hand-cleansing agents were purchased from Indústria Farmacêutica Glicolabor, Ribeirão Preto, São Paulo, Brazil.

Preparation of microbial suspension

Five colonies of the test organism from a 24-h tryptic soy agar (Difco) (blocks 1 to 5) or Sabouraud dextrose agar (Difco) (block 6) were aseptically transferred to 13 x 100 mm tubes containing 3 mL of tryptic soy broth (Difco) (blocks 1 to 5) or Sabouraud dextrose broth (Difco) (block 6) and incubated for 18 to 24 h at 37ºC. Next, the broth culture was centrifuged twice and the microbial cells resuspended in an equal volume of sterile distilled water, to give a final inoculum of approximately 108 colony-forming units (CFU). Viable counts of these microbial suspensions were performed by the drop-plate technique described by Miles et al. (25), modified as follows. Briefly, decimal serial dilutions of the microbial suspension were prepared, 0.2 mL being added to 1.8 mL of sterile saline solution.

Three 0.02 mL drops of each of the 10-4 to 10-7 dilutions were applied to each quadrant of 90 x 15 mm disposable plastic Petri plates (Inlab - Interlab Distribuidora de Produtos Científicos S.A., São Paulo, São Paulo, Brazil) containing the corresponding culture medium. After drying of the inoculum, the plates were incubated at 37ºC, for 24 h, and drops that showed between 6 and 60 colonies were selected for counting.

Experimental design

The experiments were performed using a Latin-square statistical design, with six 6 x 5 randomized blocks. Each block included six experiments. In each experiment all hand-cleansing agents were tested, and all volunteers used each hand-cleansing agent once. In each experiment a different volunteer, whose hands were contaminated but were not treated with the hand-cleansing agents, acted as a control (3,24). An interval of 7 days between experiments was maintained to allow restoration of the normal level of skin flora. The study was approved by the "Permanent Committee of Ethics in Research Involving Human Beings" of the State University of Maringá, and all volunteers gave written informed consent.

Artificial contamination of the hands

To remove transient bacterial flora, volunteers washed their hands with 5 mL of plain liquid soap and water (social wash) and dried them thoroughly with sterile paper towels. Each volunteer received 0.02 mL of the microbial suspension on each of the four fingertips of the left hand, with the palm facing upward and the fingers outstretched; the inoculum was spread by rubbing together opposing fingertips for 40 seconds. The process was completed by drying the fingers in air, without rubbing, for another 80 seconds before sampling (3). In blocks 1 to 5, the fingertips of the volunteers were contaminated with approximately 106 CFU, and in block 6 with 105 CFU. We defined fingers 1 to 4 as denoting the index, middle, ring, and little fingers, respectively.

Treatment with hand-cleansing agents

Five milliliters of 70% ethyl alcohol or 3 mL of alcohol gel was carefully poured into the cupped hands, which were rubbed palm to palm (50 to 60 times), including fingertips, for 30 seconds, and then dried in air for 30 seconds. Five milliliters of povidone-iodine, chlorhexidine, and liquid soap were applied and rubbed on for 30 seconds in the same way, but this time with the hands previously moistened in sterile distilled water. Next, the hands were rinsed with 350 mL of sterile distilled water for 15 seconds, and softly dried with two sterile paper towels for 15 seconds (3).

Recovery and culture of test organism

Each volunteer sampled his eight fingers by rubbing for 3 minutes against 10 g of sterile glass beads (3 mm in diameter), in short, flat-bottomed glass tubes (30 x 70 mm for the 1st, 2nd, and 3rd fingers, and 30 x 65 mm for the 4th fingers), containing 5 mL of 0.1% sterile peptone water (Difco) containing the following neutralizers: 1% polysorbate 80 (Difco), 0.5% lecithin (Santista Alimentos S. A., Ponta Grossa, Paraná, Brazil), and 1% sodium thiosulfate (Cinética Química Ltda., São Paulo, São Paulo, Brazil), to prevent carryover inhibition (22). Next, viable counting of these sampling fluids (dilutions 100 to 10-4) was performed by the modified drop-plate technique of Miles et al. (25).

Evaluation of effectiveness of hand-cleansing agents

The percentage of the test organisms removed from contaminated fingertips was calculated using the formula: removal rate (%) = 100 ´ [1-(treated/control)]. Kruskal-Wallis analysis of variance was used to compare the removal rates of each test organism between the treatments, using the program "Statistica for Windows - Release 6.0" (StatSoft, Inc., Tulsa, Oklahoma, 2001). A value of P < .05 was considered significant.

Controls

In each experiment, viable counts of inoculum were made on corresponding agar plates with and without neutralizers, to investigate a possible inhibitory activity of these neutralizer agents on the test organism. The counts were made by the modified drop-plate technique (25). Additionally, in each experiment, after sampling, the fluid obtained from the 1st finger (right hand) of each volunteer was tested for carryover of antiseptic. Tests for carryover were made by inoculating both tubes of sampling fluid and controls (0.1% peptone water with neutralizers) with 0.5 mL of a 10-4 dilution of an overnight tryptic soy broth culture of Staphylococcus aureus American Type Culture Collection (ATCC) 6538 (blocks 1 and 3 to 6) or Escherichia coli ATCC 25922 (block 2). After 5 to 10 min of contact, two 0.02 mL drops of each 100 to 10-3 dilution from this material were applied to the surface of plates containing tryptic soy agar and MacConkey agar (Difco), respectively. The plates were incubated for 24 to 48 h at 37ºC, and the numbers of colonies of S. aureus or E. coli control strains growing from the sampling and the control fluids were compared (2,23).

 

RESULTS

The effectiveness of the hand-cleansing agents tested in blocks 1 to 6 is shown in Table and Figure 1 . The hand-cleansing agents reduced from 93.83% (plain liquid soap) to 100% (10% PVP-I liquid soap) of the microbial population applied to the hands. In 4 of 6 test microorganisms analyzed, 10% povidone-iodine liquid soap, alcohol gel, 70% ethyl alcohol, and 4% chlorhexidine detergent had significantly higher removal rates than plain liquid soap (P < .05) (Fig. 1).

The neutralizing agents showed no inhibitory activity on test organisms. According to the control used in our study, there was no carryover inhibition in the recovery of the test organisms from fingertips after treatment with hand-cleansing agents.

 

DISCUSSION

Several studies on outbreaks of nosocomial infection have suggested or shown the dissemination of Acinetobacter baumannii (1,10,12,13), methicillin-resistant Staphylococcus aureus (5,7,26,35,39), Escherichia coli (16,18), Enterococcus faecalis (33), Pseudomonas aeruginosa (40), and Candida albicans (9,30) via contaminated hands of hospital personnel. However, we have found few reports(4) on the effectiveness of alcohol gel for removing these nosocomial opportunistic pathogens from contaminated hands.

In our study, we clearly demonstrated that alcohol gel was as effective as the traditional hand-cleansing agents 10% PVP-I liquid soap, 70% ethyl alcohol, 4% chlorhexidine gluconate detergent, and plain liquid soap in removing clinical strains of A. baumannii, methicillin-resistant S. aureus, E. coli, E. faecalis, P. aeruginosa, and C. albicans from heavily contaminated hands of human volunteers. Our findings are in agreement with previous reports from investigators outside Brazil, who have demonstrated the effectiveness of the alcohol-based gels in hand antisepsis (4,20,28,36,37).

To our knowledge, this was the first attempt in Brazil to compare the immediate effect of an alcohol hand gel with that of the traditional hand-cleansing agents, using artificially contaminated hands as the experimental model.

The test organisms in our study were chosen for two reasons. First, because they are important potential nosocomial pathogens that may cause serious infections in debilitated and severely ill patients in intensive care units (31). In most of these infections, hand or fomite transmission is implicated (1,9,18,34,35,40). Second, in hospital practice, a handrub with alcohol-based agents is especially indicated in situations in which compliance with recommended handwashing procedures is hampered by the lack or scarcity of sinks, or by nursing work overload, or both (29,37). This situation is often found in intensive care units in Brazilian hospitals (29).

In our study, the number of E. coli cells recovered from hands of the control volunteers was approximately 2 log10 (99%) lower than the original inoculum. This is not surprising, considering that E. coli strains may survive poorly on the skin of hands (14). Even so, large populations of E. coli cells remained viable on the fingertips (12,000 CFU), and may therefore present a potential risk of infection in hospitals.

In contrast, the number of test microorganisms applied on the fingertips in blocks 1, 2, 4, and 5 (about 106 cells), and in block 6 (about 105 cells) remained almost unchanged during the 2-min drying period. Thus, the hands of hospital personnel heavily contaminated by these opportunistic microorganisms in the absence of an effective handwashing procedure, may constitute an important transmission route of infection.

In our study, 4% chlorhexidine gluconate detergent was as effective as plain liquid soap, but it was less effective than alcohol gel, 70% ethyl alcohol, and 10% PVP-I liquid soap, for removing methicillin-resistant S. aureus from contaminated hands. Other studies also have suggested that chlorhexidine- based hand-cleansing agents seem to have a limited immediate effect against methicillin-resistant S. aureus strains (15,17), despite their well-recognized persistence on the skin and their excellent activity against gram-positive bacteria (8,21,32).

On the other hand, Wade et al. (38) demonstrated that 4% chlorhexidine gluconate detergent was better than plain soap for removing nosocomial vancomycin-resistant Enterococcus faecium from contaminated fingertips. In our study, chlorhexidine was also more effective than plain liquid soap in removing E. faecalis from heavily contaminated hands (Fig. 1). These different results on microbial activity of 4% chlorhexidine gluconate detergent could be in part attributed to significant differences in chlorhexidine formulations from different manufacturers (6,21).

Earlier studies have shown that alcoholic solutions, including 60 to 95 per cent ethanol or iso- or n-propanol, are generally more effective in killing transient microorganisms on the hands than antiseptic detergents or plain soap (3,4). Our results were consistent with these studies.

However, 10% PVP-I liquid soap showed a pronounced immediate effect. It was the only hand-cleansing agent tested in our study that completely removed the C. albicans population artificially applied to the fingertips. Other studies also have demonstrated the efficacy of povidone-iodine against transient microbial hand flora (2,4,23).

A variety of hand-cleansing agents, including soap, detergents, and antiseptics, is available in most hospitals. In Brazil, there is no standardized method for comparing the effectiveness of these products. For this reason, in the present study we used a procedure based on a method proposed by Ayliffe et al. (3) as a standard test for hygienic hand disinfection.

We used a neutralization technique (11) to prevent carryover inhibition. Polysorbate 80 plus lecithin and sodium thiosulfate were used to neutralize chlorhexidine and povidone-iodine, respectively (3,4,24). The neutralizer agents were effective, and showed no inhibitory effect on the test organisms.

In summary, the results obtained in the present study confirmed the effectiveness of ethanol-containing hand gel as a hygienic handrub, and suggested that 10% povidone-iodine liquid soap, alcohol gel, 70% ethyl alcohol, and 4% chlorhexidine gluconate detergent may be more effective than plain liquid soap for removing Acinetobacter baumannii, Escherichia coli, Enterococcus faecalis, and Candida albicans strains from heavily contaminated hands.

 

ACKNOWLEDGMENTS

S.E.D.H. received a scholarship from PIBIC/CNPq-UEM. We thank Vera L. D. Siqueira and Terezinha I. E. Svidzinski for supplying and identifying the microorganisms used in this study. We also thank the volunteers for their cooperation in our study, and Dr. Janet W. Reid for revision of the English text.

 

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Correspondence to:
Celso Luíz Cardoso
Laboratório de Microbiologia, Departamento de Análises Clínicas
Universidade Estadual de Maringá
Av. Colombo, 5790
87020-900, Maringá, PR, Brasil
Fax: (+5544) 2614490
E-mail: deres@maringa.com.br

 

 

Submitted: October 14, 2002; Returned to authors: May 13, 2003; Approved: May 20, 2004.

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