| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1 Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3548 CL Utrecht, The Netherlands
2 Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
3 Department of Ruminant Health, Animal Health Service, PO Box 361, 9200 AJ Drachten, The Netherlands
4 Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3548 CL Utrecht, The Netherlands and Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
An outbreak of Streptococcus uberis mastitis was described to gain insight into the dynamics of Strep. uberis infections at a herd level. Data were obtained from a longitudinal observational study on a commercial Dutch dairy farm with good udder health management. Quarter milk samples for bacteriological culture were routinely collected at 3-wk intervals from all lactating animals (n = 95 ± 5). Additional samples were collected at calving, clinical mastitis, dry-off, and culling. During the 78-wk observation period, 54 Strep. uberis infections were observed. The majority of infections occurred during a 21-wk period that constituted the disease outbreak. The incidence rate was higher in quarters that had recovered from prior Strep. uberis infection than in quarters that had not experienced Strep. uberis infection before. The incidence rate of Strep. uberis infection did not differ between quarters that were infected with other pathogens compared with quarters that were not infected with other pathogens. The expected number of new Strep. uberis infections per 3-wk interval was described by means of a Poisson logistic regression model. Significant predictor variables in the model were the number of existing Strep. uberis infections in the preceding time interval (shedders), phase of the study (early phase vs. postoutbreak phase), and prior infection status of quarters with respect to Strep. uberis, but not infection status with respect to other pathogens. Results suggest that contagious transmission may have played a role in this outbreak of Strep. uberis mastitis.
Key Words: Streptococcus uberis • mastitis • outbreak • modeling
Submitted on June 5, 2000
Accepted on October 23, 2000
This article has been cited by other articles:
|
|
 |
|
  M. A. Munoz, F. L. Welcome, Y. H. Schukken, and R. N. Zadoks Molecular Epidemiology of Two Klebsiella pneumoniae Mastitis Outbreaks on a Dairy Farm in New York State J. Clin. Microbiol., December 1, 2007; 45(12): 3964 - 3971. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 I. F. Nes, D. B. Diep, and H. Holo Bacteriocin Diversity in Streptococcus and Enterococcus J. Bacteriol., February 15, 2007; 189(4): 1189 - 1198. [Full Text] [PDF]
|
|
|
|
 |
|
 C. Foret, H. Aguero, and P. Janowicz Efficacy of two barrier iodine teat dips under natural exposure conditions. J Dairy Sci, June 1, 2006; 89(6): 2279 - 2285. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. L. Tikofsky and R. N. Zadoks Cross-Infection Between Cats and Cows: Origin and Control of Streptococcus canis Mastitis in a Dairy Herd J Dairy Sci, August 1, 2005; 88(8): 2707 - 2713. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. McDougall, T. J. Parkinson, M. Leyland, F. M. Anniss, and S. G. Fenwick Duration of Infection and Strain Variation in Streptococcus uberis Isolated from Cows' Milk J Dairy Sci, July 1, 2004; 87(7): 2062 - 2072. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
