The Infectious Diseases and Immunization Committee of the
Canadian Paediatric Society (2003) describes research on
different insect repellent products as follows: the duration of
insect repellency provided by DEET as determined by
concentration—23.8% DEET provided 5 hours of protec-
tion, 20% was effective for 4 hours, 6.65% remained
effective for 2 hours, and 4.54% provided insect repellency
for 1.5 hours; soybean oil (2%) mixture protected for 1.5
hours; whereas oil of eucalyptus appeared to provide 2 hours
of protection.