Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 38 2 2000 06 15 105 110 Vatandoost H 2015 09 28 Behaviour studies indicated that the permethrin resistant strin of An. Stephensi was 3-fold resistant to knock-down compared with the susceptible strain. The resistant strain was however 3-fold less irritable to permethrin and less responsive than the susceptible strain to the movement of an aspirator. If reduced irritability and reduced responsiveness to catch are consequences of the changes in the nervous system, then such a form of resistance may be disadvantageous to mosquitoes in natural populations. https://acta.tums.ac.ir/index.php/acta/article/view/2294 https://acta.tums.ac.ir/index.php/acta/article/download/2294/2284