Abstract
Objective: to determine characteristics of Aedes aegypti infestation in the city of Costa Rica, such as spatial distribution and its correlation with climatic factors, in order to use the data for vector control. Methodology: Fifty-one weekly samplings were carried out using ovitraps, distributed at 60 collecting points. Results: Index variance/mean showed an aggregate distribution for Ae. aegypti. Tests for fit to a negative binomial distribution showed that all samples from the population gave excellent correspondence with such a distribution, which was not the case for either positive binomial or Poisson distributions. Density of Ae. aegypti eggs increased according to the rate of rainfall. Conclusion: The rainfall was the abiotic factor that significantly influenced the level of vector infestation. The aggregate distribution observed for this species can be explained by environmental factors, such as the presence of materials disposed of in backyards and vacant lots, and by its genetic traits.
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