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Most apparent repellency failures with DEET are due to misapplications, so care should be taken to apply it thoroughly (avoiding the eyes and mucous membranes). Also remember to reapply when necessarily (this is crucial to maintain the DEET vapor mosquito barrier above the skin).
New polymerized 30% DEET cream formulations provide excellent protection not significantly exceeded by higher DEET concentrations. Physicians recommend that a formulation of no more than 10% DEET should be used on children.