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Context: Using various pesticides to control pests and vectors of diseases has a long history in households worldwide. However, most pesticides are considered toxic to and harmful to the environment. Evidence Acquisition: Electronic databases such as Google Scholar, PubMed, and Scopus were searched using the following search terms: “children”, “pesticide residues”, “risks”, “leukemia”, and “brain neoplasms”. This review was designed to identify the relevant electronic studies published from January 2000 to February 2020. Results: Children are more susceptible to pesticides because of their underdeveloped metabolic processes and disability to detoxify chemicals. Over 30% of the children’s diseases are due to environmental factors, including pesticides. The possibility of children’s pesticide exposure inside of urban houses is more than outside. In general, children can be exposed to pesticides in two ways: Direct and indirect contact. Direct contact refers to hand-to-mouth behavior in daily plays that absorbs household pesticides. Indirect contact refers to exposure via their parents’ work in hazardous environments and during pregnancy. There is a significant association between pesticide exposure via households and some cancers in children, such as leukemia and brain tumors. Conclusions: Due to the positive association between pesticide residues in households and the risk of cancers in children, public health policies must be adopted to minimize children’s exposure to pesticides in the urban household.

The aim of the present study was to explore resistance markers and possible biochemical resistance mechanisms in the Phlebotomine sand fly Phlebotomus papatasi in Esfahan Province, central Iran. Homogenous resistant strains of sand flies were obtained by exposing P. papatasi collected from Esfahan to a single diagnostic dose of DDT. The adults from the colony were tested with papers impregnated with four pyrethroid insecticides: Permethrin 0.75%, Deltamethrin 0.05%, Cyfluthrin 0.15%, and Lambdacyhalothrin 0.05% to determine levels of cross-resistance. To discover the presence of mutations, a 440 base pair fragment of the voltage gated sodium channel (VGSC) gene was amplified and sequenced in both directions for the susceptible and resistant colonies. We also assayed the amount of four enzymes that play a key role in insecticide detoxification in the resistant colonies. A resistance ratio (RR) of 2.52 folds was achieved during the selection of resistant strains. Sequence analysis revealed no knockdown resistance (kdr) mutations in the VGSC gene. Enzyme activity ratio of the resistant candidate and susceptible colonies were calculated for α-esterases (3.78), β-esterases (3.72), mixed function oxidases (MFO) (3.21), and glutathione-S-transferases (GST) (1.59). No cross-resistance to the four pyrethroids insecticides was observed in the DDT resistant colony. The absence of kdr mutations in the VGSC gene suggests that alterations in esterase and MFO enzymes are responsible for the resistant of P. papatasi to DDT in central Iran. This information could have significant predictive utility in managing insecticide resistant in this Leishmania vector.