1. Mosquito and Vector Control Division, Harris County Public Health, Houston, Texas.
2. Section of Pediatric Tropical Medicine, Department of Pediatrics, National School of Tropical Medicine, Baylor College of Medicine and Texas Children's Hospital, Houston, Texas.
3. Public Health Command Central, JBSA-Fort Sam Houston, San Antonio, Texas.
4. Department of Epidemiology, Arnold School of Public Health, University of South Carolina, Columbia, South Carolina.