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The best product was one with 24% diethyltoluamide, also known as DEET.

The main ingredient listed is diethyltoluamide, commonly known as DEET, which scientists say is among the most effective against mosquitoes.

Officials have urged park visitors to avoid walking or camping near rodent burrows, to wear long pants tucked into boots when hiking and to spray insect repellent containing the chemical diethyltoluamide, or DEET, on socks and pant legs to reduce the risk of flea bites.

Health officials told park visitors to avoid walking or camping near rodent burrows, to wear long pants tucked into boots and to spray insect repellent containing the chemical diethyltoluamide, or DEET, on socks and pant legs.

She urged park visitors to avoid walking or camping near rodent burrows, to wear long pants tucked into boots when hiking and to spray insect repellent containing the chemical diethyltoluamide, or Deet, on socks and pant legs to reduce the risk of flea bites.