Nasal carriage of Staphylococcus species by food handlers |
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| Affiliation: | 1. Laboratorio de Referencia e Investigación en Resistencia a Antibióticos e Infecciones Relacionadas con la Asistencia Sanitaria, Centro Nacional de Microbiología, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain;2. Spanish Network for Research in Infectious Diseases (REIPI RD16/0016), Instituto de Salud Carlos III, Madrid, Spain;3. Microbiology Department, Hospital Gregorio Marañón, Madrid, Spain;4. Microbiology Department, Hospital Universitario Joan XXIII, Tarragona, Spain;1. Scientific Research Institute of Children''s Infections, Saint Petersburg, Russia;2. National Agency for Clinical Pharmacology and Pharmacy, Moscow, Russia;3. N. F. Gamaleya Federal Research Centre of Epidemiology and Microbiology, Moscow, Russia;4. State Medical University named after Professor V.F. Vojno-Yasenetsky, Krasnoyarsk, Russia;5. Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan;6. International Medical Education and Research Centre, Niigata, Japan;7. North-western State Medical University named after I.I. Mechnikov, Saint Petersburg, Russia;1. German Federal Institute for Risk Assessment (BfR), Department Biological Safety, Berlin, Germany;2. Current affiliation: The Federal Office of Consumer Protection and Food Safety, Berlin, Germany |
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| Abstract: | On the basis of a variety of physiological, biochemical and morphological characteristics, 201 staphylococcal strains were identified to species level. All of the cultures were isolated from the anterior nares of food handlers. 83 strains produced coagulase and 88 produced thermonuclease. Amongst the coagulase-positive cultures, 80 belonged to the species Staphylococcus aureus and 3 could not be identified. These latter strains showed similar properties and were related to S. intermedius. S. epidermidis was the coagulase-negative species most frequently found (97 strains), followed by S. capitis (10 strains), S. saprophyticus (3 strains), S. hyicus subsp. chromogenes (2 strains), S. hominis (1 strain), S. haemolyticus (1 strain) and S. warneri (1 strain). The remaining 3 coagulase-negative strains were thermonuclease producers and one of them was identified as S. aureus. The quantitative estimations showed that most of the species isolated were present in large populations, S. aureus giving the highest counts. The strains of S. saprophyticus, novobiocin resistant species associated with animals, and S. hyicus subsp. chromogenes were isolated from food handlers woking with animals and foods derived from animals (abattoirs and butchers' shops). The possible role of food handlers in the epidemiology of staphylococcal food poisoning outbreaks is also discussed. |
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