J Arthropod-Borne Dis, December 2016, 10(4): 560–568 K Azizi et al.: Faunal Distribution and … 560 http://jad.tums.ac.ir Published Online: October 04, 2016 Original Article Faunal Distribution and Seasonal Bio-Ecology of Naturally Infected Sand Flies in a New Endemic Zoonotic Cutaneous Leishmaniasis Focus of Southern Iran Kourosh Azizi 1, Hayedeh Parvinjahromi 1, *Mohammad Djaefar Moemenbellah-Fard 1, Bahador Sarkari 2, Mohammad Reza Fakoorziba 1 1Research Centre for Health Sciences, Department of Medical Entomology and Vector Control, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran 2Basic Sciences in Infectious Diseases Research Center, Shiraz University of Medical Sciences, Shiraz, Iran (Received 29 Sep 2012; accepted 28 July 2015) Abstract Background: Cutaneous leishmaniasis is a major health problem in Iran in spite of implementation of control pro- gram. This infectious disease caused morbidity in less than 27000 people in 2010. This study was set to determine some ecological aspects of sand flies in Fasa district, Fars Province, southern Iran during 2011–2012. Methods: A total of 4792 sand flies were captured by means of sticky paper and CDC miniature light traps in 10 selected villages from the beginning to the end of the active season, from which 1115 specimens were captured for abundance study and 3677 specimens captured for monitoring monthly activities in Fasa. After species identification, extracted DNA was processed for detection of Leishmania parasite infection in sand flies. Results: Twelve species (6 Phlebotomus, 6 Sergentomyia) were identified. The most common sand fly was P. pa- patasi (82.4%) which represented 86.6% of sand flies from indoors and 82.7% from outdoors. The monthly activity of the species extended from April to the end of November. There were two peaks in the density curve of this spe- cies, one in June and the second in September. Natural infection to L. major was detected in P. papatasi (25 out of 130 sand flies, 19.2%). Conclusion: Phlebotomus papatasi is considered as a main vector of zoonotic cutaneous leishmaniasis in Fasa, Fars Province, south of Iran. Keywords: Sand flies, Leishmania, Vector, Phlebotomus, Iran Introduction Leishmania parasites can induce a range of clinical manifestations exhibited from self- healing localized dermal lesions to chronic non-healing diffuse muco-cutaneous forms (Davami et al. 2010, Shirian et al. 2011). Hu- man cutaneous leishmaniasis (CL) remains a pressing public health problem in many coun- tries of the Eastern Mediterranean region, including Iran. It is the most important and widely known malady after malaria in Iran (Moemenbellah-Fard et al. 2012). It is a group of clinically complex sand fly-borne skin in- fections caused by different species of the blood flagellate protozoan parasites in the ge- nus Leishmania (Kinetoplastida: Trypanoso- matidae). About 0.7–1.3 million cases of CL occur in 88 countries annually (Desjeux 2001). CL appears to be a major health concern, which, despite its notifiable status, necessi- tates urgent action to contain its increasingly reported cases (Abai et al. 2007, Azizi et al. 2010, 2012a-d, Fakoorziba et al. 2011). More than a quarter of all CL cases (n= 26,824) registered in 2010 within the Eastern Medi- terranean region were Iranians (Postigo 2010). This skin lesion is reported from many old world and new world countries with over 90% of cases occurring only in seven coun- *Corresponding author: Dr Mohammad Djaefar Moemenbellah-Fard, E-mail: momenbf@sums.ac.ir J Arthropod-Borne Dis, December 2016, 10(4): 560–568 K Azizi et al.: Faunal Distribution and … 561 http://jad.tums.ac.ir Published Online: October 04, 2016 tries including Iran, Afghanistan, Saudi Ara- bia, Syria, Brazil, Nepal and Peru (Desjeux 2004). The clinical signs and symptoms of CL in humans are in two forms: dry or an- throponotic (Anthroponotic Cutaneous Leish- maniasis or ACL) and wet or zoonotic (Zoon- otic Cutaneous Leishmaniasis or ZCL) forms. Leishmaniasis includes parasitic infec- tions caused by the interaction of a wide va- riety of vectors and reservoirs spread through- out the world except Australia (Ashford 2000). Leishmania-like parasites were shown in kan- garoos of Australia (Rose et al. 2004). Leish- maniasis is mainly known as a neglected dis- ease in tropical regions. Hematophagous females of some sand flies (Diptera: Psychodidae, subfamily Phlebotom- inae) are the natural vectors of Leishmania parasites in Fars Province (Oshaghi et al. 2010, Azizi et al. 2013). The sand fly, P. pa- patasi, which is the main incriminated vector of L. major, is mostly associated with colo- nies of different rodent reservoir hosts dis- tributed in various regions of Iran (Moemenbel- lah-Fard et al. 2003, Azizi et al. 2011, 2012c, Parvizi et al. 2013, Akhoundi et al. 2013, Davami et al. 2014). Human CL is endemic in more than half of the 31 Iranian provinces. The majority of CL cases in Iran are caused by L. major (Akhoundi et al. 2013). ZCL is widespread in the central, southern, eastern and western provinces of Iran. The county town of Fasa is one of the most important endemic foci of ZCL in Fars Province, southern Iran, with 1088 cases in 2007 and 185 cases in 2011. The main aim of this investigation was to capture and iden- tify the vectors of ZCL in this focus using nested PCR. Therefore, faunal distribution and seasonal activity of naturally infected sand flies were investigated in this new en- demic ZCL focus of southern Iran. To the best of our knowledge, this is the first study on the infection of sand flies with Leishma- nia parasites in this county of southern Iran. Materials and Methods Study Area This investigation was conducted in Fasa county (29°24´N, 54°15´E), Fars Province, southern Iran (Fig. 1). It is about 4,000 km2 in area and 1,370-meter altitude above the sea level. The total population of this county town was about 220,000 people in 2010. The climatic condition is very hot in summer and cold dry during winter. The main activities of the people are agriculture and farming. Sand Fly Collection Sand flies were collected from ten vil- lages, selected based on history of CL prev- alence, differential topography, and the mere presence of vectors and reservoirs of infec- tion. Sand flies were caught biweekly in two villages (Fedeshkooyeh and Miandeh) from fixed sites indoors (bedrooms, sitting rooms, toilets and stables) and outdoors (rodent bur- rows), using 30 sticky traps (castor oil-coated white papers measuring 20 cm×30 cm) from the beginning to the end of the active season (May-September) to determine sand fly month- ly activity. Each trap set on one night was taken as a "trap-night" and there were 120 "trap-nights"/month/village. For vector fau- nal study, eight villages at different points of the county town of Fasa were selected ran- domly. Sand flies were collected three times during the active season by using sticky pa- per and CDC traps. Trapped sand flies were removed from sticky papers with needles, washed in absolute acetone and stored in 70% ethanol. For species identification, sand flies were mounted in Puri's medium (Smart 1965). They were identified using the crite- ria set in the keys of Theodor and Mesghali (1964), and then mounted and segregated by sex. The middle body segments (apart from heads and last abdominal segments) of some unfed parous female sand flies with the mid- guts were kept in 70% ethanol for DNA ex- traction and subsequent PCR processing. J Arthropod-Borne Dis, December 2016, 10(4): 560–568 K Azizi et al.: Faunal Distribution and … 562 http://jad.tums.ac.ir Published Online: October 04, 2016 DNA Extraction Each female sand fly was transferred to a microtube for DNA extraction as described elsewhere (Azizi et al. 2008). The sand fly sample with DNA was added to a microtube containing 100 μl lysis buffer [50 mM Tris- HCl (pH 7.6), 1 mM EDTA, 1% (v/v) Tween 20] and 12 μl of a proteinase K solu- tion (20 μg/ml), in a 1.5 ml tube (Motazedi- an et al. 2002). The tube was incubated for 24 h at 37 °C before 200 μl of a phenol: chloroform: isoamyl alcohol mixture (25:24:1, by vol.) was added. It was stored at room temperature for 5 min then it was cen- trifuged at 15,000 rpm for 15 min. The su- pernatant solution with DNA was then taken with sampler and 200 μl cold absolute etha- nol was added. It was centrifuged at 15,000 rpm for 5 min at 4 °C, then it was evicted on a floated solution in the tube and then stored at 37 °C and 50 μl double distilled water was added and then stored at -20 °C, until it could be tested for Leishmania kDNA. PCR amplification The PCR used to amplify the variable ar- ea of the minicircle kinetoplastic DNA of any Leishmania in sand fly is described elsewhere (Aransay et al. 2000). The primers were CSB1XR (CGA GTA GCA GAA ACT CCC GTT CA) and CSB2XF (ATT TTT CGC GAT TTT CGC AGA ACG) for the first round and LiR (TCG CAG AAC GCC CCT) and 13Z (ACT GGG GGT TGG TGT AAA ATA G) for the second round. They were designed within the conserved area of the minicircle kinetoplast containing the con- served sequence blocks 3 and 2. Each 25 μl reaction mixture contained 0.5 μM of each deoxynucleoside triphosphate, 1 mM MgCl2, 1 unit Taq. polymerase (CinnaGen, Tehran, Iran), 0.5 μM CSB1XR, 0.5 μM CSB2XF primers, 5 μl DNA extract, 2.5 μl PCR buff- er and 0.3 μl DNA polymerase. PCR reac- tion mixture was set at 94 °C for 5 min, fol- lowed by 30 cycles, each of 30 s at 94 °C, 1 min at 55 °C and 1.5 min at 72 °C, and then a final extension at 72 °C for 5 min in a thermocycler (Eppendorf AG: Humburg, Ger- many). For the second round of PCR, only 1 µ M of each of 13Z and LiR primers were used. One μl of the first round products with 1/9 dilution (by vol.) were used as templates for the second round of PCR. Five μl of final products were subjected to electrophoresis on 1.5% (V/V) agar gel stained with ethidi- um bromide and visualized by UV trans- illumination. The size of each band was es- timated by comparison with the size of ref- erence strains of L. infantum (MCAN/IR/ 96/LON49), L. tropica (MHOM/IR/89/ARD2) and L. major (MHOM/IR/54/LV39). A band of 560 bp indicated that L. major kDNA was present (Azizi et al. 2012d). Results A total of 4792 sand flies were captured by means sticky paper and CDC miniature light traps in 10 selected villages, from which 1115 specimens were counted for abundance study and 3677 specimens were monitored for monthly activities (Table 1). Of all spec- imens caught, 3250 (67.8%) male and 1542 (32.2%) female were identified. Furthermore, 1108 (23.1%) from internal sites and 3684 (76.9%) were captured from external sites. Twelve phlebotomine species were mor- phologically identified as sand flies fauna (6 Phlebotomus, 6 Sergentomyia) involving P. papatasi, P. sergenti sl, P. caucasicus, P. al- exandri, P. mongolensis, P. bergeroti, S. the- odori, S. dentata, S. antennata, S. clydei, S. baghdadis, and S. sintoni. The most abundant of these sand flies was P. papatasi, which was thus considered the dominant species too. Sergentomyia baghdadis and P. sergenti sl ranked second and third dominant after P. papatasi in this area. Phlebotomus papatasi was also the dominant species both indoor (86.7%) and outdoor (80.8%), and S. bagh- dadis (5.8%) was the dominant species in J Arthropod-Borne Dis, December 2016, 10(4): 560–568 K Azizi et al.: Faunal Distribution and … 563 http://jad.tums.ac.ir Published Online: October 04, 2016 outdoor-based observations of monthly ac- tivity study. The activity of these insects started in May and ended in September (Fig. 2), and the peaks activity were twice a year (mid-June and mid-August). The kinetoplast DNA of the parasite L. major was detected in 26 (17.3%) out of the 150 female phlebotomine sand flies with nested PCR (Table 2). Twenty-five (19.2%) out of the 130 P. papatasi sand flies were infected with L. major (Fig. 3 and 4). Table 1. Fauna and relative abundance of sand flies collected in Fasa, Fars Province, southern Iran, 2011 Sand fly species Indoor n (%) Outdoor n (%) Male n (%) Female n (%) Total n (%) P. (Phlebotomus) papatasi P. (Phlebotomus) bergeroti P. (Paraphlebotomus) alexandri P. (Paraphlebotomus) sergenti sl P. (Paraphlebotomus) caucasicus P. (Paraphlebotomus) mongolensis S. (Sergentomyia) theodori S. (Sergentomyia) dentata S. (Sergentomyia) antennata S. (Sergentomyia) sintoni S. (Parrotomyia) baghdadis S. (Sintonius) clydei 267 (86.7) 4 (1.3) 9 (2.9) 8 (2.6) 3 (0.97) 1 (0.3) 5 (1.6) 3 (0.97) 0.0 0.0 7 (2.3) 1 (0.32) 652 (80.8) 5 (0.61) 19 (2.35) 25 (3.09) 11 (78.6) 0.0 21 (2.7) 8 (1) 1 (0.1) 2 (0.2) 47 (5.8) 16 (2) 687 (74.8) 0.0 17 (60.7) 22 (66.7) 14 (100) 1 (100) 5 (19.2) 3 (27.3) 1 (100) 2 (100) 21 (38.9) 11 (64.7) 232 (25.2) 9 (100) 11 (39.3) 11 (33.3) 0.0 0.0 21 (80.8) 8 (72.7) 0.0 0.0 33 (61.1) 6 (35.3) 919 (82.4) 9 (0.8) 28 (2.5) 33 (2.95) 14 (1.25) 1 (0.1) 26 (2.3) 11 (1) 1 (0.1) 2 (0.2) 54 (4.8) 17 (1.5) Total 308 (27.62) 807(72.38) 779 (69.9) 336 (30.1) 1115 (100) Fig. 1. Local map of the study area, Fasa, in Fars Province of southern Iran. The numbers 1–10 refer to sampling sites: 1-Amirhajiloo, 2-Sheshdeh, 3-Jelian, 4-Vaselabad, 5-Miandeh, 6-Fedeshkooyeh, 7-Sahrarood, 8-Kooshke- ghazi, 9-Maghaberi, 10-Vakilabad J Arthropod-Borne Dis, December 2016, 10(4): 560–568 K Azizi et al.: Faunal Distribution and … 564 http://jad.tums.ac.ir Published Online: October 04, 2016 Table 2. PCR-based rate of infection among selected sand fly species in Fasa, Fars Province, southern Iran, 2011 Sand fly species Tested Infected (%) P. (Phlebotomus) papatasi P. (Paraphlebotomus) sergenti S. (Sergentomyia) theodori S. (Parrotomyia) baghdadis 130 5 10 5 25 (19.2) 0 (0) 1 (10) 0 (0) Total 150 26 (17.3) Fig. 2. Seasonal activity of sand flies collected in Fasa, southern Iran, during 2011 Fig. 3. Nested PCR gel electrophoresis of reference strains with four distinct primers (CSBIXR, CSB2XF, LiR and 13Z) in 1.5% agar gel stained with ethidium bromide. Lane 1: 100 bp marker, Lane 2: Leishmania. tropica, Lane 3: L major and Lane 4: L. infantum standards Fig. 4. Electrophoresis results produced by nested PCR of female sand fly specimens with four primers (CSBIXR, CSB2XF, LiR and 13Z) in 1.5% agarose gel stained with ethidium bromide. Lane 1: 100 bp marker, Lane 2: Leishmania tropica, Lane 3: L. in- fantum, Lane 5: negative control (male sand fly), Lanes 6, 8, 9, 12, and 14: parasite-free female Phlebotomus papatasi, Lane 15: uninfected female sand fly P. sergenti, Lanes 4, 7, 10, 11, 13 and 16: sand fly P. papatasi infected with the parasite L. major 0 200 400 600 800 1000 1200 1400 1600 1800 5th M ay 20th May 5th June 20th June 5th July 20th July 5th Aug 20th Aug 5th Sept 20th Sept N u m b e r o f sa n d fl ie s Annual Cycle P. papatasi Total No J Arthropod-Borne Dis, December 2016, 10(4): 560–568 K Azizi et al.: Faunal Distribution and … 565 http://jad.tums.ac.ir Published Online: October 04, 2016 Discussion Control of leishmaniasis necessitates stud- ies on the epidemiology and ecology of this disease vectors and reservoir hosts. The en- tomological survey and epidemiological study are two important components of control against the spread of infectious agents. Com- mon infection with Leishmania parasites in sand fly and human in the same place are important features for introducing the main vectors (Killick-Kendrick 1990). Fasa district is one of the most endemic cutaneous leishmaniasis foci of Fars Prov- ince. In spite of control program, some 3224 people were affected by this disease during the period of 2006–2013 (Khosravani et al. 2014) and the disease foci still exist in this district. This study was the first on vectors of leishmaniasis in this area. The present study found 12 species of sand flies (6 Phleboto- mus and 6 Sergentomiya). Based on these results, P. papatasi was the most abundant both indoors and outdoors. P. papatasi was introduced as the dominant species in this province (Salehi 1997, Kalantari 2003, Azizi et al. 2008, 2010, Davami et al. 2010). Phlebotomus alexandri was one of the iden- tified species in this study, previously re- ported to be a visceral leishmaniasis vector in some parts of Iran (Azizi et al. 2008, Bakh- shi et al. 2013). Phlebotomus sergenti sl was also identified in this study which is effec- tive in the transmission of cutaneous leish- maniasis in Iran (Moin-Vaziri et al. 2007, Oshaghi et al. 2010). Sand fly activity from mid-May to the beginning of November had two peaks in late June and September and P. papatasi was the dominant species which was modulated with the activity design of other sand flies in this area and was almost consistent with the activity of sand flies in ZCL foci in Iran (Yaghoobi-Ershadi et al. 2001, Abai et al. 2007). Molecular (PCR) method was used to de- tect Leishmania infection in sand flies. Some 150 unfed parous females were examined by nested PCR techniques and proved their in- fection to be L. major in 19.2% of P. papa- tasi species. Previous reports had proved L. major infection in P. papatasi in Iran (Rassi et al. 2011). This method was used since it was very easy compared to other methods if it was set up in the laboratory, large number of species can be examined in a short time. This method could not distinguish between amastigotes (those parasites without flagella in human) and promastigote (flagellated form of parasite in sand fly body) (Azizi et al. 2012b). In order to ensure transmission of parasite by sand flies, it is essential to exam- ine parous or empty stomach female sand fly (Molyneux and Ashford 1983). A single infection of S. theodori was found in this study. Natural promastigote infection of other species of Sergentomyia like S. dentata sand flies have previously been reported from Ardebil Province, north- west of Iran (Rassi et al. 1997), though this finding does not represent an evidence of this sand fly being a vector. Evaluation of infection in sand flies was tested by PCR. This method has as high sen- sitivity and specificity as ELISA method used before (Maleki-Ravasan et al. 2009). The sand flies that were used in this study had mostly digested blood. According to our studies, a consistent pat- tern of abundance and fauna in this region occurs with other ZCL foci in Iran. Phleboto- mus papatasi is the main cutaneous leish- maniasis vector in this district. Epidemiolog- ic study on reservoirs and human infection are essential for providing proper control program. The personal protection including the use of long-lasting insecticidal nets (LLIN), installing screens on windows and doors, using repellents, and environmental improvements such as waste fertilizers and trash as well as rodent control in houses are J Arthropod-Borne Dis, December 2016, 10(4): 560–568 K Azizi et al.: Faunal Distribution and … 566 http://jad.tums.ac.ir Published Online: October 04, 2016 the most important strategies in the leish- maniasis control program. Conclusion Phlebotomus papatasi is considered as a main vector of zoonotic cutaneous leishman- iasis in Fasa, Fars Province, south of Iran. Acknowledgements The authors appreciate the improvements to this article meticulously proposed by the anonymous peer reviewers. The present pa- per was extracted from the results of an ap- proved student MSc thesis in Medical En- tomology (Contract No: 89-5280 Dated 13th August 2011) conducted by the second au- thor, Ms Hayedeh Parvinjahromi. It was fi- nancially supported by Shiraz University of Medical Sciences (SUMS). Thanks are due to the Vice-chancellor for Research and Tech- nology at SUMS, for permitting the use of facilities at the university. We are also in- debted to Ms Dabagh for help with academic issues, Mr M Sharafi and Mrs M Amin for help in the field and diagnosis and to Mr M Kalantari for assistance on PCR tests. No competing interests exist. 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