{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T00:27:31Z","timestamp":1780532851056,"version":"3.54.1"},"reference-count":99,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2025,5,20]],"date-time":"2025-05-20T00:00:00Z","timestamp":1747699200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"The Thailand Science Research and Innovation (TSRI) Fundamental Fund, fiscal year 2024"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:sec>\n               <jats:title>Background<\/jats:title>\n               <jats:p>The existence and transmission of pathogenic and antibiotic-resistant bacteria through currency banknotes and coins poses a global public health risk. Banknotes and coins are handled by people in everyday life and have been identified as a universal medium for potentially microbial contamination.<\/jats:p>\n            <\/jats:sec>\n            <jats:sec>\n               <jats:title>Methods<\/jats:title>\n               <jats:p>To ascertain existence of medically important bacteria, a total of 300 samples including 150 banknotes and 150 coins were randomly collected at onsite retail fresh meat stores, <jats:italic>i.e.<\/jats:italic>, pork and chicken, fish, and seafood stores, from nineteen fresh markets distributed across Bangkok, Thailand. An individual banknote or coin was entirely swabbed, and bacterial culture was carried out using tryptic soy agar (TSA), sheep blood agar (SBA) and MacConkey agar (Mac). A colony count was performed and bacterial species identification was conducted using matrix-assisted laser desorption\/ionization (MALDI)-time of flight (TOF) mass spectrometry. Phenotypic antimicrobial susceptibility testing was carried out using the Kirby\u2013Bauer disc diffusion methods.<\/jats:p>\n            <\/jats:sec>\n            <jats:sec>\n               <jats:title>Results<\/jats:title>\n               <jats:p>The results demonstrated that the bacterial contamination rate was higher on banknotes than on coins (93.33% <jats:italic>vs.<\/jats:italic> 30.00%) in all three store types. A substantial number of colonies of &gt;3,000 colony forming units (CFU) was predominantly found in banknotes (70.00%), especially from fish store (83.3%); meanwhile, &lt;1,000 CFU was observed in coin sample (76.67%). MALDI-TOF mass spectrometry could identify 107 bacterial species, most of them were <jats:italic>Staphylococcus kloosii<\/jats:italic> (14.02%, 15\/107), <jats:italic>Staphylococcus saprophyticus<\/jats:italic> (12.15%, 13\/107), and <jats:italic>Macrococcus caseolyticus<\/jats:italic> (8.41%, 9\/107). The prevalence based on genera were <jats:italic>Staphylococcus<\/jats:italic> (36.45%, 39\/107), <jats:italic>Acinetobacter<\/jats:italic> (20.56%, 22\/107), and <jats:italic>Macrococcus<\/jats:italic> (10.28%, 11\/107). Almost all Staphylococcus isolates had low susceptibility to penicillin (21%). Notably, <jats:italic>Staphylococcus\u00a0arlettae<\/jats:italic>, <jats:italic>Staphylococcus haemolyticus<\/jats:italic> and <jats:italic>M. caseolyticus<\/jats:italic> were multidrug-resistant (MDR). It is notable that none of the staphylococci and macrococci isolates exhibited inducible clindamycin resistance (D-test negative). <jats:italic>Escherichia coli<\/jats:italic> and <jats:italic>Pseudomonas putida<\/jats:italic> isolates were carbapenem-resistant, and <jats:italic>Acinetobacter baumannii<\/jats:italic> isolates were MDR with showing carbapenem resistance.<\/jats:p>\n            <\/jats:sec>\n            <jats:sec>\n               <jats:title>Conclusion<\/jats:title>\n               <jats:p>Our data demonstrated a high prevalence of medically important bacteria presented on Thai currency, which may pose a potential risk to human health and food safety. Food vendors and consumers should be educated about the possible cross-contamination of bacteria between the environment, food item, and currency.<\/jats:p>\n            <\/jats:sec>","DOI":"10.7717\/peerj.19465","type":"journal-article","created":{"date-parts":[[2025,5,20]],"date-time":"2025-05-20T08:59:38Z","timestamp":1747731578000},"page":"e19465","source":"Crossref","is-referenced-by-count":1,"title":["Identification of bacteria on Thai banknotes and coins using MALDI-TOF mass spectrometry and their phenotypic antimicrobial susceptibility profiles"],"prefix":"10.7717","volume":"13","author":[{"given":"Nattamon","family":"Niyomdecha","sequence":"first","affiliation":[{"name":"Department of Medical Technology, Faculty of Allied Health Sciences, Thammasat University,  Khlong Luang, Pathum Thani, Thailand"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Suwitchaya","family":"Sungvaraporn","sequence":"additional","affiliation":[{"name":"Department of Medical Technology, 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