Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: January 1, 2001
Publication Date: N/A
Technical Abstract: Three deet alternate repellents (KBR 3023, IR3535, "Natural Insect Repellent" [NIR]) and deet (25 percent in ethanol) were tested on human subjects for repellency to black salt marsh mosquitoes. Mosquito biting rates during the test ranged from 2 to 80 per minute with an average biting rate of 12 per minute. The mean period of complete protection from mosquito bites was 5.2 plus or minus 1.1 hours (hr) for deet, 5.4 plus or minus 1.3 hr for KBR 3023, 4.2 plus or minus 1.8 hr for IR 3535, and 3.8 plus or minus 1.9 hr for NIR. Percentage repellency for deet, KBR 3023, and IR 3535 was 90 percent after 6 hr and 80 percent for NIR. When biting rates on the untreated arm of treated subjects (i.e., those receiving deet or a deet alternative on one arm) were compared with biting rates on untreated subjects (ethanol control), a significant repellent effect, lasting as long as 4 hours, was observed for the untreated arm of treated subjects.