Regional and Temporal Variations of Leptospira Seropositivity in Dogs in the United States, 2000–2010
Article first published online: 5 MAR 2014
Copyright © 2014 by the American College of Veterinary Internal Medicine
Journal of Veterinary Internal Medicine
Volume 28, Issue 3, pages 779–788, May/June 2014
How to Cite
Lee, H.S., Levine, M., Guptill-Yoran, C., Johnson, A.J., von Kamecke, P. and Moore, G.E. (2014), Regional and Temporal Variations of Leptospira Seropositivity in Dogs in the United States, 2000–2010. Journal of Veterinary Internal Medicine, 28: 779–788. doi: 10.1111/jvim.12335
- Issue published online: 28 APR 2014
- Article first published online: 5 MAR 2014
- Manuscript Accepted: 21 JAN 2014
- Manuscript Revised: 30 DEC 2013
- Manuscript Received: 25 JUL 2013
- Morris Animal Foundation
- Leptospira ;
- Microscopic agglutination tests;
- Seasonal cycle subseries plot;
- Seasonal-trend decomposition procedure based on loess;
Previous studies have reported a seasonal increased risk for leptospirosis, but there is no consistent seasonality reported across regions in the United States.
To evaluate and compare seasonal patterns in seropositivity for leptospirosis in dogs for 4 US regions (northeast [NE], midwest [MW], south-central [SC], and California-southern west coast [CS]).
Forty four thousand nine hundred and sixteen canine serum samples submitted to a commercial laboratory for microscopic agglutination tests (MAT) from 2000 through 2010.
In this retrospective study, positive cases were defined as MAT titers ≥1 : 3,200 for at least one of 7 tested serovars. Four geographic regions were defined, and MAT results were included in regional analyses based on hospital zipcode. A seasonal-trend decomposition method for times series was utilized for the analysis. Monthly variation in the seropositive rate was evaluated using a seasonal cycle subseries plot and logistic regression.
Two thousand and twelve of 44,916 (4.48%) samples were seropositive. Compared to seropositive rates for February, significantly higher monthly rates occurred during the 2nd half of the year in the MW (OR 3.92–6.35) and NE (OR 2.03–4.80) regions, and only in January (OR 2.34) and December (OR 1.74) in the SC region. Monthly seropositive rates indicative of seasonality were observed earlier in the calendar year for both CS and SC regions.
Conclusions and Clinical Importance
Seasonal patterns for seropositivity to leptospires differed by geographic region. Although risk of infection in dogs can occur year round, knowledge of seasonal trends can assist veterinarians in formulating differential diagnoses and evaluation of exposure risk.