“Supermobile Superbugs” International travel and antibiotic …€¦ · CTX-M: A true global...
Transcript of “Supermobile Superbugs” International travel and antibiotic …€¦ · CTX-M: A true global...
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“Supermobile Superbugs” International travel and antibiotic resistance
Patrick Harris Microbiologist, Pathology Queensland; ID Physician PA Hospital
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Source:www.gov.uk/government/publica7ons/progress-report-on-the-uk-five-year-amr-strategy-2014
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More than 2 billion people travel long distances each year
~300 million / year travel to areas highly endemic for antibiotic resistance
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Global movement of people • IATA: ~1.45 billion international air travel
passengers estimated for 2016 o ~35% of all international air travel in Asia-Pacific
region, set to expand rapidly
• UN Tourism: 348 million international tourists Jan-April 2016 o ~18 million more than the same period in 2015
(+5.3%) o 2016: will be the 7th consecutive year of above-
average growth in tourism
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http://www.iata.org; http://www2.unwto.org
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h$p://www.unhcr.org
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Zowawi,Harrisetal.NatUrolRev2015
Gram-nega)vespossessmul)plemechanismstoresistan)bio)cs
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Plasmidsandresistance• ~25%ofbacterial
genomeacquiredbyLateralGeneTransfer
• AllowsphenomenaldiversityandrapidadaptaEon
• >18,000potenEalgenesintheE.coli“pan-genome”despitetherebeingonly~2000genesineachcell
Lateral(Horizontal)GeneTransfer
Daughtercellsinheritresistancegenes
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“Lateral gene transfer potentially makes all genes in the microbial biosphere a single, common and shared resource. In the same way that wars can be won by nations with the greatest industrial capacity, so it is that bacteria can draw on a global resource that .... can rapidly mobilize and transfer useful genes across physical and phylogenetic distances.” Stokes & Gillings FEMS Microbiol Rev 35 (2011): 790–819
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CTX-M: A true global traveller
Davies, 2010;74:417-433
• “Cefotaximase-Munich”ESBL• Originsfromchromosomalklu
beta-lactamaseofKluyvera– plasmiduptakeincommon
pathogense.g.E.coli,Salmonellaspp
– Mayhaveoccurredmul/ple/mes
• During1990s,differentreportsatthesameEmeofthesameenzymesinverydistantcountries
• OnceCTX-MpenetratesaspecificgeographicareaittendstodisplaceTEM/SHVESBLs
• Frequentlyseeninsuccessfulpandemicclonese.g.ST131uropathogenicE.coli
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MERINO Trial: 3GC-R E. coli / K. pneumoniae in BCs
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33% blaCTX-M-15 23% blaCTX-M-27 9% blaCTX-M-14
(all belong to CTX-M-9 lineage)
Dominance of ST-131 E. coli carrying CTX-M-type
ESBLs
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3rdgeneraEoncephalosporinresistantEnterobacteriaceae–urinaryisolates
12Zowawi,Harrisetal.NatUrolRev2015
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13h$ps://issuu.com/cddep/docs/niaid.apr_.2016_rl/1
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18,695isolates,47.5%Gram-negaEvebacilli~60%ofK.pneumoniaeresistanttocarbapenems!
!!
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Overall 21% of Finnish travellers acquired ESBLs; 37% if had diarrhoea and antibiotics
Kantele et al, Clinical Infectious Diseases, January 2015
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What is happening in Australia? Resistance in community-onset infections
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ChangefooterusinginstrucEonsonslide7 18
MainlydrivenbyIMP-4carbapenemasein
Enterobacter
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May 2016: retrieval from an overseas hospital • Severe burns – day 4 of admission (under contact precautions from admission)
Polymicrobial bloodstream infection, including carbapenem-resistant A. baumannii (CRAB): susceptible only to colistin (MIC 0.125), tigecycline (MIC=2) and doxycycline (MIC=2)
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9AS
CRAB ESBL-K. pneumoniae Mero-R Pseudomonas IMP-4 +ve Enterobacter cloacae
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• Eachcircle=onepaEent• Sizeofcircle=numberofisolates• Solidline=idenEcalcoregenomeSNP
profile• Arrow=direcEonoftransmissionfrom
SNPprofile
DiagramcourtesyofLeahRoberts
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Acknowledgements
UQCCR/SCMB/ACE• Sco$Beatson• MarkSchembri• LeahRoberts• BrianForde• DavidPatersonPathologyQueensland• JoelDouglas• GraemeNimmo• ClaireHeney• NarelleGeorge• HaakonBerg• ElizabethCatchpoole• PALaboratoryFunding:RBWHIDDept.,PQStudyEducaEon&ResearchCommi$ee(SERC)Transparency:Noconflictsofinteresttodeclare
[email protected]@padstamundo
RBWH• JeffLipman• KrispinHajkowicz• MarionWoods• TrishHurst• InfecEonControlTeam
PAH• GeoffPlayford• Naomi
Runnegar• InfecEon
controlteam