Epidemiological and partial budget analysis for treatment of subclinical Staphylococcus aureus intramammary infections considering microbiological and cytological scenarios

dc.contributor.authorPetzer, Inge-Marie
dc.contributor.authorEtter, Eric Marcel Charles
dc.contributor.authorDonkin, Edward Francis
dc.contributor.authorWebb, E.C. (Edward Cottington)
dc.contributor.authorKarzis, Joanne
dc.contributor.emailinge-marie.petzer@up.ac.zaen_ZA
dc.date.accessioned2018-03-01T05:43:09Z
dc.date.issued2017-12
dc.description.abstractAn innovative method was investigated to aid in the elimination of Staphylococcus aureus (S. aureus) intramammary infections (IMI) from dairy herds. A stochastic model explore the economic benefit of three-day or eight-day treatment of subclinical IMI in all S. aureus infected cows or in only those with a somatic cell count (SCC) exceeding 200,000 cells/ml. An epidemiological model was developed to run parallel to the economic model that would predict the S. aureus IMI likely to persist, develop new infections and clinical mastitis. In the economic model a first algorithm was used to consider the low prevalence (LP) scenario and made use of S. aureus prevalence information provided by retrospective analysis of microbiological and cytological results in South Africa (2008–2012). The data used considered Staphylococcus aureus prevalence from [1.495; 1.595]95% to [6.72; 6.95]95% for SCC ≤ 200,000 and SCC > 200,000 cells/ml respectively. A second algorithm considered the high prevalence (HP) scenario to evaluate a simulated situation with a 5[U1] [R12] to 25% prevalence. Scenarios of low or high transmission ratio (TR) were included in the model according to the hygiene management on the farm. Probabilities and costs were calculated over 255 days. The economic models predicted average cost indices for low S. aureus IMI and low TR to vary from −3179 ZAR (South African Rands) when subclinical cases with SCC higher than 200,000 cell/ml were treated for eight days, to −3663 ZAR when all subclinical S. aureus IMI were treated for three days. With a HP and high TR of S. aureus the average cost indices changed from −18,042 ZAR when none to −5433 ZAR per 255 days when all S. aureus IMI were treated for eight days. The epidemiological model in this study predicted substantial benefit of treatment mainly in high TR scenarios. New IMI decreased up to77% in the three-day and up to 91% in the eight-day treatment scenarios. In the HP scenarios, persistent IMI were reduced by 94%. The number of clinical cases predicted with no treatment for subclinical infections was higher than the total number of clinical and subclinical cases in scenarios where cows were treated three or eight days. Initial prudent treatment of subclinical IMI resulted in less overall treatments and less new, persistent and clinical cases. Combined results of economic and epidemiological models indicated that the option that cost the least did not always have the best epidemiological outcome. Models may assist in optimising and balancing decisions relating to financial and IMI.en_ZA
dc.description.departmentAnimal and Wildlife Sciencesen_ZA
dc.description.departmentProduction Animal Studiesen_ZA
dc.description.embargo2018-12-01
dc.description.librarianhj2018en_ZA
dc.description.urihttp://www.elsevier.com/locate/prevetmeden_ZA
dc.identifier.citationPetzer, I.-M., Etter, E.M.C., Donkin, E.F. et al. 2017, 'Epidemiological and partial budget analysis for treatment of subclinical Staphylococcus aureus intramammary infections considering microbiological and cytological scenarios', Preventive Veterinary Medicine, vol. 148, pp. 66-77.en_ZA
dc.identifier.issn0167-5877 (print)
dc.identifier.issn1873-1716 (online)
dc.identifier.other10.1016/j.prevetmed.2017.10.005
dc.identifier.urihttp://hdl.handle.net/2263/64136
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2017 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Preventive Veterinary Medicine. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Preventive Veterinary Medicine, vol. 148, pp. 66-77, 2017. doi : 10.1016/j.prevetmed.2017.10.005.en_ZA
dc.subjectIntramammary infections (IMI)en_ZA
dc.subjectSomatic cell count (SCC)en_ZA
dc.subjectLow prevalence (LP)en_ZA
dc.subjectHigh prevalence (HP)en_ZA
dc.subjectMastitis treatmenten_ZA
dc.subjectSubclinical Staphylococcus aureusen_ZA
dc.subjectStochastic economic modelen_ZA
dc.subjectAntibiotic agenten_ZA
dc.subjectAntibiotic therapyen_ZA
dc.subjectBovine mastitisen_ZA
dc.subjectCostsen_ZA
dc.subjectDairy cattleen_ZA
dc.subjectDisease transmissionen_ZA
dc.subjectEconomic modelen_ZA
dc.subjectMicrobiological examinationen_ZA
dc.subjectNonhumanen_ZA
dc.subjectPrevalenceen_ZA
dc.subjectRecurrent diseaseen_ZA
dc.subjectSouth Africa (SA)en_ZA
dc.subjectStaphylococcus infectionen_ZA
dc.titleEpidemiological and partial budget analysis for treatment of subclinical Staphylococcus aureus intramammary infections considering microbiological and cytological scenariosen_ZA
dc.typePostprint Articleen_ZA

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