Journal of Arthropod-Borne Diseases
Volume:9 Issue: 1, Jun 2015

This study was aimed to collect wild rodents for endoparasites determination in some parts of Sistan and Baluchistan Province, southeastern Iran nearby Pakistan and Afghanistan countries. A total of 100 wild rodents were captured alive with cage traps. Various samples were collected from blood and feces, also impression smear prepared from different organs. The samples were prepared by formalin-ether or stained with Giemsa, after that were examined under microscope. All the caught rodents (47 Tatera indica, 44 Meriones hurriana, 5 Gerbilus nanus and 4 Meriones libycus) were studied for endoparasites emphasizing to their zoonotic aspects. Endoparasites including Spirurida, Hymenolepis diminuta, Hymenolepis nana feraterna, Trichuris trichiura, Skerjabino taenia, Trichostrongylus spp, Entamoeba muris, Chilomastix mesnili and Leishmania spp were parasitologically identified. Among 9 genera or species of the identified parasites at least 5 of them have zoonotic and public health importance.

Mosquitoes are considered as the vectors of dirofilariasis and some vector borne disease in Iran. The objective of this study was to determine the susceptibility level of the vectors to various insecticides recommended by WHO for any control measures in an endemic area in northwestern Iran. Mosquito larval and adult collections were carried out using different methods provided by WHO includ­ing dipping and hand catch techniques. The susceptibility level was assessed to DDT 4%, malathion 5%, propoxur 0.1%, deltamethrin 0.05% and lambda-cyhalothrin 0.05%. Totally, 749 adults and 5060 larvae of Culicidae mosquitoes were collected comprising seven species of adult and larvae, including: Anopheles claviger, An. maculipennis, An. sacharovi, Culex hortensis, Cx. pipiens, Cx. theileri and Culiseta longiaerolata. Frequency of larvae and adults of An. maculipennis was very low, so susceptibil­ity tests on this species did not performed. Results showed that Cx. theileri, Cs. longiaerolata and Cx. pipiens were resistant to DDT 4%, lambda-cyhalothrin 0.05%, and propoxur 0.1% whereas found tolerant to deltamethrin 0.05% and malathion 5%. The LT50 and LT90 values for five insecticides were calculated. We suggest the same study in different parts of the world to obtain the data due to bionomic and sus­ceptibility status of dirofilariasis vectors. This information will help the health authorities for monitoring and evalua­tion of control measures.

According to the national strategy plan on monitoring of insecticides resistance, this study was carried out to determine the base line susceptibility of the Culicidae mosquitoes to the WHO-recommended insecticides in an endemic focus of malaria in southeastern Iran. Larval collection was carried out by dipping method and adult collection occurred by suction tube from January to December 2010. The susceptibility test was assessed to DDT 4%, malathion 5%, propoxur 0.1%, deltamethrin 0.05%, lambda-cyhalothrin 0.05%, and cyfluthrin 0.15% at different interval times (discriminative dose) followed by 24 h recovery period. The LT50 and LT90 values were calculated for plotting the regression line using Microsoft office Excel software ver. 2007. Anopheles stephensi was quite resistant to DDT and showed susceptible or tolerant to other insecticides. The LT50 andLT90 values to DDT in this species were 29.07, and 98.26 minutes, respectively. Anopheles culicifacies and An. dthali were found susceptible or tolerant to insecticides. Culex pipiens was found resistance to DDT, propoxur, lambda-cyhalothrin and cyfluthrin whereas observed susceptible to malathion and tolerant to deltamethrin. Ochlerotatus caspius sl. was resistant to DDT, whereas found susceptible to other insecticides. Culisita longiareolata was susceptible to deltamethrin, whereas tolerant to other insecticides. The LT50 andLT90 values of Cs.longiareolata to DDT were 17.82, and 51.26 minutes. We suggested the same study in different parts of the country for monitoring and evaluation of control measures.

Cockroaches mechanically spread pathogenic agents, however, little is known about their gut microbiota. Identification of midgut microbial community helps targeting novel biological control strategies such as paratransgenesis. Here the bacterial microbiota of Periplaneta americana midgut, were identified and evaluated for finding proper paratransgenesis candidate. Midgut of specimens were dissected and cultivated in different media. The bacterial isolates were then identified using the phenotypic and 16S-rRNA sequencing methods. The analytical profile index (API) kit showed presence of 11 bacterial species including: Escherichia coli, Shigella flexineri, Citrobacter freundii, E. vulneris, Enterobacter cloacae, Yersinia pseudotuberculosis, Y. intermedia, Leclericia adecarboxylata, Klebsiella oxytoca, K. planticola, and Rahnella aquatilis in the cockroach midguts. The first three species are potentially symbiotic whereas others are transient. The conventional plating method revealed presence of only four isolates of Salmonella, E. coli, and Proteus which in three cases mismatched with API and 16S-rRNA genotyping. The API correctly identified the four isolates as Shigella flexneri, Citrobacter freundii, and E. coli (n= 2). 16S-rRNA sequence analysis confirmed the API results; however the C. freundii se­quence was identical with C. murliniae indicating lack of genetic variation in the gene between these two closely related species. A low number of potentially symbiotic bacteria were found in the American cockroach midguts. Among them Enterobacter cloacae is a potential candidate for paratransgenesis approach whereas other bacteria are pathogens and are not useful for the approach. Data analysis showed that identification levels increase from the con­ventional to API and to genotyping respectively.

The aim of this study was to obtain new data which would be valuable to develop programs for future planning of mosquito controls in in western Iran. Larvae and adult collections were carried out from different habitats using standard dipping and animal baited trap methods during May, June and July 2012 in two provinces (Kurdistan and Kermanshah) in the west of Iran. Characteristics of breeding places were studied based on the habitat type (River edge, Ground pool), water con­ditions (clear or turbid, stagnant or running), vegetation (With or without vegetation), water temperature, sunlight exposure (full or partial sunlight) and so on. Overall, 4081 third- and fourth-instars larvae and 2013 Adult were collected. Five genera and eleven spe­cies of the family Culicidae were identified. Mosquitoes collected in larval and adult stages including, Anopheles maculipennis s.l. (4.1%, 4.42%), An. superpictus (1.35%,1.39%), An. turkhudi (1.75%,1.68%), Aedes vexans (2.5%, 8.78%), Culex hortensis (1.59%, 1.04%), Cx. mimeticus (5%, 2.38%), Cx. pipiens (16.5%, 8.15%), Cx. theileri (10%, 46.4%), Culiseta longiareolata (24%, 4.27%), and Cs. subochrea (24%, 4.27%) and Ochlerotatus caspius s.l. (9.1%, 21.46%). Culiseta longiareolata and Cs. subochrea found predominant species in larval collection, whereas Culex theileri was dominant in Adult collection. Anopheles turkhudi is reported for the first time in Kermanshah Province. Due to the geographical location of the two provinces, extensively studies with emphasis on mosquito ecology, to having comprehensive and up to date information is essential.

The most part of Iran become malaria-free region and fall in prevention of re-introduction stage. These regions however are struggling with imported of malaria cases where malaria vectors exist. Therefore, understanding the situation of mosquito vectors is crucial. This study was carried out to find out the present situation of malaria vectors and malaria transmission potential in a malaria-free area. The study was conducted in a malaria free area, Izeh County, Khuzestan Province during 12 months in 2011–2012. Five villages, including 2 in highlands and 3 in plain area, were selected randomly. The mosquito sam­pling methods were conducted using spray sheet and hand catch collection methods from indoor/outdoors, window trap and larvae collections. In total, 3352 female Anopheles were captured, 1826 mosquito from highland and 1526 from plain areas. Five species, An. stephensi, An. fluviatilis s.l., An. dthali, An. superpictus and An. pulcherrimus were identified. The seasonal activities were started from April to March. The abdominal conditions of collected mosquitoes from in­door/outdoor places pointed to exophilic propensity of An. fluviatilis.l. s.l. and endophilic behaviour for rest of the vectors. The results of window trap also confirmed these behaviors. The larval habitats of four species were widely dispersed and included spring, margin of rivers, irrigation channels, stagnant water and rice filed. Understanding the present situation of malaria vectors in free-malaria area is crucial particularly where is struggling with imported cases. The results of present study can be expanded to other area of northern Khuzestan for malaria vector control planning in reintroduction prevention stage.

Anopheles stephensi is a sub-tropical species and has been considered as one of the most important vector of human malaria throughout the Middle East and South Asian region including the malarious areas of south­ern Iran. Current reports confirmed An. stephensi resistance to temephos in Oman and India. However, there is no comprehensive research on mechanisms of temephos resistance in An. stephensi in the literature. This study was de­signed in order to clarify the enzymatic and molecular mechanisms of temephos resistance in this species. Profile activities of α- and ß-esterases, mixed function oxidase (MFO), glutathione-S-transferase (GST), insensitive acetylcholinesterase, and para-nitrophenyl acetate (PNPA)-esterase enzymes were tested for An. stephensi strain with resistance ratio of 15.82 to temephos in comparison with susceptible strain. Results showed that the mean activity of α-EST, GST and AChE enzymes were classified as altered indi­cating metabolic mechanisms have considerable role in resistance of An. stephensi to temephos. Molecular study using PCR-RFLP method to trace the G119S mutation in ACE-1 gene showed lack of the mutation responsible for organophosphate insecticide resistance in the temephos-selected strain of An. stephensi. This study showed that the altered enzymes but not targets site insensitivity of ACE-1 are responsible for temephos resistance in An. stephensi in south of Iran.

Female sand flies of subgenus Adlerius are considered as probable vectors of visceral leishmaniasis in Iran. The objective of this study was to determine the morphological and genotypic variations in the populations of this subgenus in the country. Sand flies collected using sticky traps from 17 provinces during 2008–2010. The morphometric measure­ments were conducted with a Ocular Micrometer. Data was analyzed by SPSS. The Cytb gene was used to estimate population genetic diversity and identify the female specimens. UPGMA phenetic tree was used for DNA haplotypes of Cytb gene. Six species of subgenus Adlerius identified from which one species, P. (Adlerius) kabulensis, is new record. The identification key is provided for males. Results revealed the molecular systematic in the species of subgenus Adlerius and determine the relationship of three females of P. comatus, P. balcanicus and P. halepensis. The positions of three females and the males in the UPGMA tree are correct and the similarities among them confirm our results. The branches of each species are not genetically distinct which justify the overlapping morphological characters among them. Molecular sequencing of Cytb-mtDNA haplotypes can be used for female identification for different species of subgenus Adlerius in Iran.

Hedgehogs are small, nocturnal mammals which become popular in the world and have important role in transmission of zoonotic agents. Thus, the present study aimed to survey ectoparasite infestation from April 2010 to December 2011 in urban and suburban parts of Urmia and Tabriz Cities, Northwest of Iran. A total number of 84 hedgehogs (40 females and 44 males) were examined. They have been carefully in­spected for ectoparasites and collected arthropods were stored in 70% ethanol solution. The identification of arthro­pods was carried out using morphological diagnostic keys. The occurrence of ticks on hedgehogs was 23 (67.7%) with Rhipicephalus turanicus in Urmia and 11 (22%) as well as 1(2%) with Rh. turanicus and Hyalomma anatolicum anatolicum in Tabriz, respectively. One flea species, Archaeopsylla erinacei, was found with prevalence of 19 (55.9%) and 27 (54%) in Urmia and Tabriz Cities, respec­tively. Prevalence of infestation with Rh. turanicus and A. erinacei were not different (P> 0.05) between sexes of hedgehogs in two study areas. Highest prevalence of tick and flea infestation was in June in Urmia, whereas it was observed in August in Tabriz. Both tick and flea parasitizing hedgehogs showed seasonal difference in prevalence (P< 0.05) in Urmia, but it was not detected in Tabriz (P> 0.05). The result showed the high occurrence of ectoparasites in hedgehog population and according to the zoonotic potential of these animals as vector of some agents further studies are needed to investigate in different parts of Iran.

Ferulago carduchorum Boiss and Hausskn belongs to the Apiaceae family. This plant grows in west part of Iran that local people added it to dairy and oil ghee to delay expiration date and give them a pleasant taste. The aim of this study was to investigate the antioxidant, antimicrobial, acetyl cholinesterase inhibition, cytotoxic, larvicidal activities and composition of essential oil of F. carduchorum. Acetyl cholinesterase (AChE) inhibitory, larvicidal activities and chemical composition of essential oil of F. carduchorum were investigated. Besides, antioxidant, antimicrobial and cytotoxic activities of essential oil were tested using DPPH, microdilution method and MTT assay, respectively. The major components of essential oil were (z)-β-ocimene (43.3%), α-pinene (18.23%) and bornyl acetate (3.98%). Among 43 identified components, monoterpenes were the most compounds (84.63%). The essential oil had noticeable efficiency against Candida albicans (MIC= 2340 µg ml-1) and it was effective against Anopheles stephensi with LC50 and LC90 values of 12.78 and 47.43 ppm, respectively. The essential oil could inhibit AChE (IC50= 23.6 µl ml-1). The essential oil showed high cytotoxicity on T47D, HEP-G2 and HT-29 cell lines (IC50< 2 μg ml-1). The essential oil of F. carduchorum collected from west of Iran had anti-Candida, larvicidal and cyto­toxicity effects and should be further investigated in others in vitro and in vivo experimental models.

The aim of this study was to generate in silico 3D-structure of the envelope protein of AHFV using homology modeling method to further predict its conformational epitopes and help other studies to investigate its structural features using the model. A 3D-structure prediction was developed for the envelope protein of Alkhumra haemorrhagic fever virus (AHFV), an emerging tick-borne flavivirus, based on a homology modeling method using M4T and Modweb servers, as the 3D-structure of the protein is not available yet. Modeled proteins were validated using Modfold 4 server and their accuracies were calculated based on their RSMDs. Having the 3D predicted model with high quality, conformational epitopes were predicted using DiscoTope 2.0. Model generated by M4T was more acceptable than the Modweb-generated model. The global score and P-value calculated by Modfold 4 ensured that a certifiable model was generated by M4T, since its global score was almost near 1 which is the score for a high resolution X-ray crystallography structure. Furthermore, itsthe P-value was much lower than 0.001 which means that the model is completely acceptable. Having 0.46 Å rmsd, this model was shown to be highly accurate. Results from DiscoTope 2.0 showed 26 residues as epitopes, forming conformational epitopes of the modeled protein. The predicted model and epitopes for envelope protein of AHFV can be used in several therapeutic and diagnostic approaches including peptide vaccine development, structure based drug design or diagnostic kit development in order to facilitate the time consuming experimental epitope mapping process.

Myiasis is the invasion of vertebrates'' tissue by the larvae of a fly of the order Diptera. The objective of this paper is to present a rare case of secondary myiasis of ocular infestation by Chrysomya bezziana. A 55-year-old female from Sar village of Mazandaran Province, northern Iran), referred to Khatam Al-Anbia Hospital of Mashhad with exten­sive destruction of left orbital cavity. Existence of larvae was the major complaint in recent months. Some live larvae were removed from her destructed left eye. Primary diagnosis was myiasis of left upper lid (LUL) and suspected recurrent Basal cell carcinoma (BCC). The laboratory diagnosis was done in parasitology lab of Imam Reza Hospital of Mashhad and collected larvae were identified and confirmed to be larvae of the C. bezziana (Diptera: Calliphoridae). It is a case report of secondary ophtalmiomyiasis due to C. bezziana of a patient lives in Mazandaran Province.

Linguatula serrata is one of the important zoonotic parasites. Carnivores serve as definitive host. The larvae ex­isted in mesenteric lymph nodes (MLNs), liver, lungs, etc of intermediate herbivores. The definitive host becomes infected by ingesting viscera containing the infective nymphal stage. Humans may be infected with Linguatula either by ingestion of nymphs resulting in a condition called nasopharyngeal linguatulosis or Halzoun syndrome or by in­gestion of infective eggs which develop in internal organs resulting in visceral linguatulosis. Indian crested porcu­pine (Hystrix indica) is a common rodent in Middle East. Based on some tradition, consumption of Histrix meat and viscera is common in some parts of Iran. The present study reports the occurrence of Linguatula serrata nymph in H. indica as a new intermediate host from southwest of Iran.