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Table 1 Summary of the 2004 analysis grid containing the possible actions according to the degree of virus activity.

From: The Integrated System for Public Health Monitoring of West Nile Virus (ISPHM-WNV): a real-time GIS for surveillance and decision-making

Situation Possible actions
No virus activity - Verify the dead Corvidae reports
- Maintain preventive activities (media)
Possible source of infection (infected Corvidae found) - Target the geographical zone of activity and determine the population density
- Assess clusters of dead Corvidae
- Plan for mobile mosquito monitoring
- Closely monitor equine cases
- Maintain preventive activities (media)
Probable source of infection (infected mosquitoes or both infected Corvidae and infected mosquitoes found) - Target the geographical zone of activity and determine the population density
- Prioritise the analysis of dead Corvidae in the affected region
- Assess clusters of dead Corvidae
- Assess mosquito pool information (species and positivity)
- Closely monitor equine cases
- Integrate meteorological data into the analysis
- Consider insecticide treatments
- Increase preventive activities (media)
Confirmed source of infection (human cases detected) - Associate probabilities with potential acquisition site
- Target the geographical zone of activity and determine the population density
- Prioritise the analysis of dead Corvidae in the affected region
- Assess clusters of dead Corvidae
- Assess mosquito pool information (species and positivity)
- Closely monitor equine cases
- Integrate meteorological data into the analysis
- Consider insecticide treatments
- Increase preventive activities (media)