Herd demographics correlated with the spatial distribution of a foot-and-mouth disease epidemic in Buenos Aires province, Argentina

Michael P. Ward, Andres M. Perez

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

During a recent foot-and-mouth disease epidemic in Argentina, cattle herds affected in 2001 were located mainly (69%) in Buenos Aires province. The densities of outbreaks (no. of outbreaks per km 2) and cattle-demographic variables in the province were estimated using a geographical information system and kernel function. Before the epidemic officially was recognized, the density of outbreaks was correlated (r sp = 0.28-0.47) with the geographic distribution of small (≤100 cattle), dairy and fattening herds. During the mass-vaccination campaign to control the epidemic (April-July), the density of outbreaks was most strongly correlated (r sp = 0.20-0.25) with the distribution of large (>500 cattle) and breeding herds. After the end of the mass-vaccination campaign, large herds and number of cows were most strongly correlated (r sp = 0.16-0.26) with outbreak density. These relationships might indicate that: (1) the disease spread more rapidly or was more easily detected in intensive production systems at the beginning of the epidemic; (2) vaccination and other control methods applied were less effective in large, semi-intensive production systems; (3) incomplete vaccine protection was responsible for herd outbreaks that occurred after the end of the mass-vaccination campaign.

Original languageEnglish (US)
Pages (from-to)227-237
Number of pages11
JournalPreventive Veterinary Medicine
Volume65
Issue number3-4
DOIs
StatePublished - Oct 14 2004

Bibliographical note

Funding Information:
The authors acknowledge the assistance of Dr. Ricardo Maresca and Dr. Bernardo Cosentino (Epidemiology Department, SENASA), who provided much of the epidemic information. This study was partly funded by a Global Initiative Faculty Grant, Purdue University International Programs.

Keywords

  • Argentina
  • Buenos Aires
  • Foot-and-mouth disease
  • GIS
  • Spatial distribution

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