Journal Article > Research
Rev Panam Salud Publica. 19 April 2023; Volume 47; 1.; DOI:10.26633/RPSP.2023.48
Bastidas-Caldes C, Guerrero-Freire S, Ortuño-Gutiérrez N, Sunyoto T, Gomes-Dias CA, et al.
Rev Panam Salud Publica. 19 April 2023; Volume 47; 1.; DOI:10.26633/RPSP.2023.48
OBJECTIVE
Colistin is an antibiotic of last resort for treating serious Gram-negative bacterial infections. However, the misuse of colistin, especially as an animal growth promoter, has contributed to increasing antimicrobial resistance, mediated mainly through plasmid transfer of the mcr-1 gene. This study assessed the prevalence of phenotypic and molecular colistin resistance in Escherichia coli and Klebsiella pneumoniae in Ecuador in healthy humans and their chickens and pigs.
METHODS
Fecal samples were collected from humans and their chickens and pigs in two rural coastal and Amazon regions between April and August 2020. Gram-negative bacteria were isolated and identified using conventional techniques. Phenotypic resistance was determined using the broth microdilution technique, and the mcr-1 gene was detected using conventional polymerase chain reaction.
RESULTS
A total of 438 fecal samples were obtained from 137 humans, 147 pigs and 154 chickens. The prevalence of E. coli isolates was 86.3% (378/438) and K. pneumoniae, 37.4% (164/438). Overall, the mcr-1 gene was found in 90% (340/378) of E. coli isolates, with higher prevalences found in isolates from coastal regions (96.5%, 191/198), humans (95.6%, 111/116) and chickens (91.8%, 123/134); for K. pneumoniae, the gene was found in 19.5% (32/164) of isolates, with equal distribution between regions and hosts. Only four isolates, two E. coli and two K. pneumoniae, showed phenotypic resistance: mcr-1 was present in both E. coli strains but absent in the K. pneumoniae strains.
CONCLUSIONS
Despite a low prevalence of phenotypic resistance to colistin, the high prevalence of the mcr-1 gene in E. coli is of concern. Ecuador’s ban on using colistin in animal husbandry must be enforced, and continual monitoring of the situation should be implemented.
Colistin is an antibiotic of last resort for treating serious Gram-negative bacterial infections. However, the misuse of colistin, especially as an animal growth promoter, has contributed to increasing antimicrobial resistance, mediated mainly through plasmid transfer of the mcr-1 gene. This study assessed the prevalence of phenotypic and molecular colistin resistance in Escherichia coli and Klebsiella pneumoniae in Ecuador in healthy humans and their chickens and pigs.
METHODS
Fecal samples were collected from humans and their chickens and pigs in two rural coastal and Amazon regions between April and August 2020. Gram-negative bacteria were isolated and identified using conventional techniques. Phenotypic resistance was determined using the broth microdilution technique, and the mcr-1 gene was detected using conventional polymerase chain reaction.
RESULTS
A total of 438 fecal samples were obtained from 137 humans, 147 pigs and 154 chickens. The prevalence of E. coli isolates was 86.3% (378/438) and K. pneumoniae, 37.4% (164/438). Overall, the mcr-1 gene was found in 90% (340/378) of E. coli isolates, with higher prevalences found in isolates from coastal regions (96.5%, 191/198), humans (95.6%, 111/116) and chickens (91.8%, 123/134); for K. pneumoniae, the gene was found in 19.5% (32/164) of isolates, with equal distribution between regions and hosts. Only four isolates, two E. coli and two K. pneumoniae, showed phenotypic resistance: mcr-1 was present in both E. coli strains but absent in the K. pneumoniae strains.
CONCLUSIONS
Despite a low prevalence of phenotypic resistance to colistin, the high prevalence of the mcr-1 gene in E. coli is of concern. Ecuador’s ban on using colistin in animal husbandry must be enforced, and continual monitoring of the situation should be implemented.
Journal Article > CommentaryFull Text
Rev Panam Salud Publica. 19 April 2023; Volume 47; e8.; DOI:10.26633/RPSP.2023.8
Calero-Cáceres W, Ortuño-Gutiérrez N, Sunyoto T, Gomes-Dias CA, Bastidas-Caldes C, et al.
Rev Panam Salud Publica. 19 April 2023; Volume 47; e8.; DOI:10.26633/RPSP.2023.8
English
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Whole-genome sequencing is becoming the gold standard for pathogen characterization and offers considerable advantages for understanding the evolution and dissemination of new determinants of antimicrobial resistance. Despite the benefits of whole-genome sequencing for pathogen characterization, implementation costs and lack of expertise may limit its use by public health laboratories. This article reviews the advantages of whole-genome sequencing for pathogen characterization and the current status of the use of whole-genome sequencing for antimicrobial resistance surveillance in Ecuador. A roadmap is suggested for including whole-genome sequencing for pathogen characterization based on the needs of the health reference institutions through alliances with Ecuadorian universities. Establishing a partnership between public health institutions and academia would be valuable for clinicians, policy-makers, and epidemiologists who could then take reasonable measures in those areas and establish a basis for adapting One Health strategies to tackle antimicrobial resistance in Ecuador.
Journal Article > CommentaryFull Text
Public Health Action. 21 September 2014; Volume 4 (Issue 3); DOI:10.5588/pha.14.0028
Zachariah R, Kumar AMV, Reid A, Van der Bergh R, Isaakidis P, et al.
Public Health Action. 21 September 2014; Volume 4 (Issue 3); DOI:10.5588/pha.14.0028
Journal Article > CommentaryFull Text
Public Health Action. 21 September 2012; Volume 2 (Issue 3); DOI:10.5588/pha.12.0022
Bissell K, Harries AD, Reid A, Edginton ME, Hinderaker SG, et al.
Public Health Action. 21 September 2012; Volume 2 (Issue 3); DOI:10.5588/pha.12.0022
Journal Article > CommentaryFull Text
Trop Med Int Health. 1 November 2010; Volume 15 (Issue 11); DOI:10.1111/j.1365-3156.2010.02630.x
Zachariah R, Tayler-Smith K, Ngamvithayapong-Yana J, Ota M, Murakami K, et al.
Trop Med Int Health. 1 November 2010; Volume 15 (Issue 11); DOI:10.1111/j.1365-3156.2010.02630.x
Journal Article > CommentaryFull Text
Afr Health. 1 January 2016
Harries AD, Takarinda KC, Zachariah R
Afr Health. 1 January 2016
Journal Article > CommentaryFull Text
Trop Med Int Health. 10 August 2011; Volume 16 (Issue 11); DOI:10.1111/j.1365-3156.2011.02863.x
Tayler-Smith K, Zachariah R, Manzi M, Kizito W, Vandenbulcke A, et al.
Trop Med Int Health. 10 August 2011; Volume 16 (Issue 11); DOI:10.1111/j.1365-3156.2011.02863.x
Journal Article > LetterFull Text
Trop Med Int Health. 30 May 2013; Volume 18 (Issue 8); DOI:10.1111/tmi.12133
Zachariah R, Reid AJ, Van der Bergh R, Dahmane A, Kosgei RJ, et al.
Trop Med Int Health. 30 May 2013; Volume 18 (Issue 8); DOI:10.1111/tmi.12133
Journal Article > ResearchFull Text
Trop Med Int Health. 1 December 2010; Volume 15 (Issue 12); DOI:10.1111/j.1365-3156.2010.02649.x
Bemelmans M, van den Akker T, Ford NP, Philips M, Zachariah R, et al.
Trop Med Int Health. 1 December 2010; Volume 15 (Issue 12); DOI:10.1111/j.1365-3156.2010.02649.x
Objective To describe how district-wide access to HIV/AIDS care was achieved and maintained in Thyolo District, Malawi. Method In mid-2003, the Ministry of Health and Médecins Sans Frontières developed a model of care for Thyolo district (population 587 455) based on decentralization of care to health centres and community sites and task shifting. Results After delegating HIV testing and counseling to lay counsellors, uptake of testing increased from 1300 tests per month in 2003 to 6500 in 2009. Shifting responsibility for antiretroviral therapy (ART) initiations to non-physician clinicians almost doubled ART enrolment, with a majority of initiations performed in peripheral health centres. By the end 2009, 23 261 people had initiated ART of whom 11 042 received ART care at health-centre level. By the end of 2007, the universal access targets were achieved, with nearly 9000 patients alive and on ART. The average annual cost for achieving these targets was €2.6 per inhabitant/year. Conclusion The Thyolo programme has demonstrated the feasibility of district-wide access to ART in a setting with limited resources for health. Expansion and decentralization of HIV/AIDS service-capacity to the primary care level, combined with task shifting, resulted in increased access to HIV services with good programme outcomes despite staff shortages.
Journal Article > ResearchFull Text
Int J STD AIDS. 1 March 2003; Volume 14 (Issue 3); DOI:10.1258/095646203762869197
Zachariah R, Spielmann M P, Harries AD, Nkhoma W, Chantulo A, et al.
Int J STD AIDS. 1 March 2003; Volume 14 (Issue 3); DOI:10.1258/095646203762869197
In Thyolo District, Malawi, a study was conducted among commercial sex workers (CSWs) attending mobile clinics in order to; determine the prevalence and pattern of sexually transmitted infections (STIs), describe sexual behaviour among those who have an STI and identify risk factors associated with 'no condom use'. There were 1817 CSWs, of whom 448 (25%) had an STI. Of these, the commonest infections included 237 (53%) cases of abnormal vaginal discharge, 109 (24%) cases of pelvic inflammatory disease and 95 (21%) cases of genital ulcer disease (GUD). Eighty-seven per cent had sex while symptomatic, 17% without condoms. Having unprotected sex was associated with being married, being involved with commercial sex outside a known rest-house or bar, having a GUD, having fewer than two clients/day, alcohol intake and having had no prior medication for STI. The high levels of STIs, particularly GUDs, and unprotected sex underlines the importance of developing targeted interventions for CSWs and their clients.