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Articles by H. Vatandoost
Total Records ( 8 ) for H. Vatandoost
  M. Khoobdel , M. Shayeghi , H. Vatandoost , Y. Rassi , M.R. Abaei , H. Ladonni , A. Mehrabi Tavana , S.H. Bahrami , M.E. Najaffi , S.H. Mosakazemi , K. Khamisabadi , S. Azari Hamidian and M.R. Akhoond
  In this study, six types of current military uniforms of Iran were treated by permethrin (0.125 mg permethrin [AI] cm-2) and examined against the biting of natural population mosquitoes of rural areas of kazeroon, Fars Province, south of Iran, namely Culex and Anopheles. Eight volunteers were selected for this study. Six of them put on the treated uniforms and the other two ones wore the untreated uniforms. All the subjects participated in the night biting test for eight active nights of July and August 2004. There was no significant difference in the protection of different treated uniforms against mosquitoes biting. In this study, the average number of biting among who wore untreated uniforms (controls) was 3.21 mosquito biting/min/person (192.8 h-1). This amount was 0.26 (15.6 h-1) for who wore treated uniforms (cases). The relative protection level of treated uniforms, in comparison with untreated ones, was about 91.9%. The protection percent of treated uniforms for different species of mosquitoes, in comparison with untreated ones, was calculated through determining the species of captured mosquitoes, separately from case and control subjects. The results showed that the relative protection percent of treated uniforms against species of Culex bitaeniohynchus, Cx. tritaeniorhynchus, Cx. perexiguus, Cx. theileri and An. stephensi was 72.7, 87, 89.8, 84.3 and 78.7, respectively. The results of chemical analysis with High Performance Thin Layer Chromatography (HPTLC) method, before and after field test, showed that in two weeks of study, there hasn`t been any significant decrease in the amount of uniforms` permethrin.
  H. Vatandoost , R. Abdoljabari Boonab , M.R. Abai , M.A. Oshaghi , Y. Rassi , S. Gholizadeh , K. Mashhadi-Esmail A. Kousah , M. Haghi , M. Gorghani , B. Aliakbarie-Sharabiani , M. Seif Farshid and N. Piazak
  An entomological survey was carried out on the bionomics of Anophelines species in Kalibar, East-Azerbaijan during the year 2003-2004. The result showed that five Anophelines species comprising A. sacharovi, A. maculipennis, A. superpictus, A. hyrcanus and A. claviger were present in the study area. Based on the species density rate it was assumed that A. sacharovi could play an important role in malaria transmission and A. maculipennis and A. superpictus could be considered as secondary vectors. A. sacharovi was active from May to September which peaks in July and August in outdoor and indoor, respectively. This species was mainly endophil and anthropophil. Biting activity of A. sacharovi took place in the second half of night. Susceptibility tests using the WHO-recommended discriminative doses of insecticides revealed that this species is resistant to DDT, tolerant to dieldrin and susceptible to malathion, fenitrothion, permethrin, and deltamethrin. A. maculipennis had high density at the beginning of summer, then its population fell down slowly and in early autumn reached to the lowest. The population of this species was found frequently in human shelters and most of its bites took place in the second half of night. Its larvae occurred in slow flowing water and channels with water plants and were more abundant in August.
  H. Vatandoost and A.A. Hanafi-Bojd
  In this study┬áthe susceptibility status of the field and laboratory strains of Anopheles stephensi, the main malaria vector, was determined to different larvicides. Five larvicides, i.e., chlorpyrifos-methyl, Bacillus thuringiensis, temephos, fenitrothion and methoprene were tested using WHO standard test method in the laboratory condition, against the field and lab strains of Anopheles stephensi Liston of Hormozgan province, southeastern Iran. The LC50 values were calculated from the probit-regression line for each larvicide. Results exhibited the LC50 values for B. thuringiensis, chlorpyrifos-methyl, fenitrothion, temephos and methoprene as 0.08483, 0.01115, 0.001131, 0.001613, 0.00073 mg L-1, respectively for lab strain. The values of 0.521279, 0.016419, 0.002475, 0.003388 and 0.000825 mg L-1, were measured as LC50 against field strain, respectively. From the results it can be concluded that there was significant difference between two strains for B. thuringiensis, temephos and fenitrothion at the LC50 level. The field strain was more tolerant than lab strain to the three larvicides. At diagnostic dose as recommended by WHO both strains are susceptible to all larvicides, therefore they can be applied for malaria vector control in the region.
  Y. Rassi , E. Javadian , A. Nadim , A. Zahraii , H. Vatandoost , H. Motazedian , K. Azizi and M. Mohebali
  Visceral leishmaniasis is one of the most important health problems in Iran which is transmitted by sandflies species to human. In order to determine vector/s of the disease an investigation was carried out in Meshkinshahr district, the most important focus of the disease in Ardebil province, north west of Iran, during 2001-2005. Using sticky papers, CDC light traps and aspirators, totally 2500 sandflies were collected and identified at the species level. Host blood preference and natural infection of female specimens to promastigotes were tested, respectively using ELISA and dissection followed by PCR assay using species-specific kinetoplast minicircle primers. Results showed that six species of Phlebotomus kandelakii, P. perfiliewi transcaucasicus, P. papatasi, P. jacusieli, P. caucasicus and P. sergenti were present in the district, where P. kandelakii with 40% was the most prevalent species. Anthropophilic index of P. kandelakii species was calculated 32.8%, indicating a strong preference to human. Among the dissected female sandflies, only 11 out of 1002 (1.1%) of P. kandelakii was found naturally infected with promastigotes. Species-specific amplification of the Giemsa stained promastigote slides revealed specific PCR products of Leishmania infantum DNA in the infected P. kandelakii sand-flies. Having found high prevalence and anthropophic index and natural infection to Leishmania infantum provide enough evidences to incriminate the species of P. kandelakii as the main and proven vector of visceral leishmaniasis for the first time in the region and in science.
  B. Davari , H. Vatandoost , H. Ladonni , M. Shaeghi , M.A. Oshaghi , H.R.Basseri , A.A. Enayati , Y. Rassi , M.R. Abai , A.A. Hanfi Bojd and K. Akbarzadeh
  Using of insecticides depend largely on the knowledge of the susceptibility levels of malaria vectors to these chemical. In this study, the susceptibility levels of Anopheles stephensi to DDT 4%, dieldrin 0.4%, fipronil 1%, deltamethrin 0.05%, permethrin 0.75%, lambdacyhalothrin 0.05% and cyfluthrin 0.15% were determined according to WHO methods in three endemic malarious regions; Sistan and Baluchistan, Hormozgan and Fars provinces. The LT50 values of different insecticides were calculated using the probit regression line for each strain. The results showed that An. stephensi is resistant to DDT, dieldrin and fipronil in all regions; however Bandar Abbas strain showed the highest level of resistance to these three insecticides. All the tested strains were sensitive against four pyrethroid insecticides. The LT50 of Bandar Abbas strain against cyfluthrin and deltamethrin with 5.46 and 3.22 min were the highest and the lowest values respectively. The highest and the lowest mortality rates of the Kazeroon strain of An. stephensi were against lambdacyhalothrin and permethrin with 6.80 and 0.682 min, respectively. In Iranshahr region, the figures for deltamethrin, permethrin, lambdacyhalothrin and cyfluthrin were 3.50, 5.10, 3.95 and 5.38 min, respectively. The results of the study suggested a possible cross-resistance between dieldrin and fipronil. Regarding the sensitivity of An. stephensi to different pyrethroids in the malarious regions of Iran, using pyrethroids is still suggested. Performing complementary tests with cyfluthrin on Bandar Abbas strain and with permethrin on Iranshahr strain seems to be necessary.
  Z. Telmadarraiy , H. Nasirian , H. Vatandoost , M. Abuolhassani , M. Tavakoli , Z. Zarei , O. Banafshi , J. Rafinejad , S. Salarielac and F. Faghihi
  The toxicity of cypermethrin was determined in five different soft tick strains of Argas persicus Oken and Ornithodoros lahorensis Neuman by topical application method. The O. lahorensis Bij, O. lahorensis west Ol, O. lahorensis Mesh, A. persicus Lor, A. persicus West Ap strains were collected from Bijar, Kurdistan province, Takab, Western Azerbaijan province, Meshkinshar, Ardebil province, Khoramabad, Lorestan province, Takab, Western Azerbaijan province of different areas of Islamic Republic of Iran, respectively during 2004 and 2005. In the topical application bioassay, the average LD50 of O. lahorensis Bij, West Ol, Mesh and A. reflexus Lor and West AP strains were 0.03, 0.04, 1.7, 0.7 and 1.7 μg tick-1, respectively and the steep slopes of dose-response curves indicated that the field population of these soft tick strains were homogenous in response to cypermethrin. Comparison of the resistance ratio of collected strains with susceptible strain showed a resistance ratio of 56.7 and 2.4-folds for cypermethrin in O. lahorensis Mesh and A. reflexus West Ap strains, whereas the O. lahorensis West Ol completely susceptible to cypermethrin.
  H. Nasirian , H. Ladonni and H. Vatandoost
  The duration of fipronil topical application toxicity of twelve strains of German cockroaches, Blattella germanica (L.), was determined. The Saman strain was collected in 2002, from infested Habitable Convened and the Bustan-7, Bustan-8, Bustan-10, Kouye-Pezeshky, Shahmorady, Zanjan and Kouye-Tehran strains were collected in 2001, from different infested student dormitories and the Fayyazbaghesh, Mogtameh and Kouye-Dokhteran strains were collected in 1997 from two infested hospitals and one student dormitory, respectively in Tehran, Iran. In the topical application bioassay, the average LD50 of susceptible strain was 1.8, 1.3 and 0.96 ng per insect after 24, 48 and 72 h, respectively and the average LD95 was 3.4, 2.6 and 2.2 ng per insect after 24, 48 and 72 h, respectively. As with the susceptible reference strain, where LD50 was halved from 24 to 72 h, the LD50 of fipronil decreased with time in the field populations. LD50 varied > 3-fold from 1.2 to 3.6 ng per insect at 24 h and almost 2.5-fold from 1.2 to 3.0 ng per insect at 48 h. At the end of the bioassay at 72 h, LD50 varied from 0.94 to 2.5 ng per insect, which is 1.6- and 2.6-fold higher than the standard susceptible value of fipronil and the steep slopes of dose-response curves indicated that the field population of these German cockroach strains was homogenous in response to fipronil. All German cockroach strains showed a similar susceptibility or lower tolerance (1.5 to 2.6-folds) for fipronil compared with the susceptible laboratory strain and the steep slopes of dose-response curves indicated that the field population of these German cockroach strains was homogenous in response to fipronil. These results indicate that the fipronil was relatively slow-acting in topical application bioassay, with LD50 values decreasing until 72 h and becoming stable thereafter.
  H. Nasirian , H. Ladonni , M. Shayeghi , H. Vatandoost , Y. Rassi , M.R. Yaghoobi Ershadi , J. Rafinejad and H.R. Basseri
  The duration of fipronil WHO glass jar method toxicity against twelve strains of feral German cockroaches, Blattella germanica (L.), was determined. In the WHO glass jar bioassay, the average LT50 of susceptible strain was 16.4,14.3,12.4 and 11.3 exposure minutes after 24,48,72 and 96 h, respectively and the average LT95 was 20.3,19.9,19.5 and 19.1 exposure minutes after 24,48,72 and 96 h, respectively. As with the susceptible reference strain, where LT50 was halved from 24 to 96 h, the LT50 of fipronil decreased with time in the feral German cockroach strains. LT50 varied > 8-folds from 16.2 to 24.7 exposure min at 24 h, 8.4 folds from 14.4 to 22.8 min at 48 h and almost 8.8 folds from 12.5 to 21.3 exposure minutes at 72 h. At the end of the bioassay at 96 h, LT50 varied from 11.6 to 19.7 exposure minutes, which is 1.0 and 1.7 folds exposure min higher than the standard susceptible value of fipronil. All German cockroach strains showed a similar susceptibility or very low tolerance (1.5 to 1.7 folds) to fipronil compared with the susceptible laboratory strain and the steep slopes of time exposure-mortality curves indicated that the feral German cockroach strains was homogenous in time exposures to fipronil. These results indicate that the fipronil was relatively slow-acting in WHO glass jar method bioassay, with LT50 values decreasing until 96 h and becoming stable thereafter.
 
 
 
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