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Pure white gold : Subclinical mastitis in dairy camels in Kenya with a special focus on Streptococcus agalactiae

Seligsohn, Dinah (2021). Pure white gold : Subclinical mastitis in dairy camels in Kenya with a special focus on Streptococcus agalactiae. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-758-8
eISBN 978-91-7760-759-5
[Doctoral thesis]

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Abstract

In the drylands of the Horn of Africa, camels are fundamental for food and nutritional security due to their ability to produce milk despite limited access to feed and water. Subclinical mastitis (SCM) is common in the region and has a negative impact on food security and household income. In this thesis project, we investigated the prevalence, aetiology and potential biomarkers of SCM. Antibiotic susceptibility was assessed and the molecular epidemiology of Streptococcus agalactiae (SRA) investigated through genomic and phylogenetic analysis. In total, 804 udder quarters in 206 lactating camels were screened using the California Mastitis Test and milk was sampled for bacteriological culture. Whole-genome sequencing was carried out on 122 SRA genomes collected from camel milk and extramammary sources. The prevalence of SCM at quarter, camel and herd level was 26%, 46% and 100% respectively and SCM was associated with a higher age, later stage in lactation and lesions on the udder or teats. The most common udder pathogen was SRA, followed by non-aureus staphylococci and Staphylococcus aureus. Tetracycline resistance was widespread among SRA isolates. Most SRA isolates from milk belonged to sequence type (ST) 616 and showed signs of adaptation to the mammary gland. However, there was a high nasal prevalence in healthy camels and the same STs were found in milk and extramammary isolates, suggesting a more complex epidemiology than previously assumed. Udder health in camels could be improved with the development of informed control strategies adapted to the local context.

Authors/Creators:Seligsohn, Dinah
Title:Pure white gold : Subclinical mastitis in dairy camels in Kenya with a special focus on Streptococcus agalactiae
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2021
Number:2021:40
Number of Pages:141
Publisher:Department of Clinical Sciences, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-758-8
ISBN for electronic version:978-91-7760-759-5
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Clinical Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Microbiology (Microbiology in the medical area to be 30109)
Keywords:Camelus dromedarius, antibiotic susceptibility, whole-genome sequencing, GBS, molecular epidemiology, pastoralist, NAGase, LDH, SCC
URN:NBN:urn:nbn:se:slu:epsilon-p-111899
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111899
ID Code:23725
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Clinical Sciences
Deposited By: SLUpub Connector
Deposited On:21 May 2021 07:03
Metadata Last Modified:25 May 2021 06:31

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