Bekir Oguz

• Doctor of Parasitology
• Professor (Associate) at Van Yuzuncu Yil University Faculty of Veterinary Medicine

One of the areas in Türkiye where animal husbandry is practiced extensively is the Eastern Anatolia Region. In the province of Van, which belongs to this region, depending on the sociocultural factors of the people, animal husbandry is carried out, especially in the form of small ruminant breeding. One of the most commonly reported intracellular ti...

Theileriosis is a tick-borne disease caused by protozoon species in the Theileria genus of the Theileriidae family. The biochemical changes induced by infection are considered to be an important understanding of the pathophysiology of caprine theileriosis. In this study, it was aimed to determine oxidative stress, thyroid hormones, trace elements,...

The impact of co-infections with Theileria ovis and Anaplasma ovis on caprine health is very limited knowledge and is rarely documented in the literature. Türkiye is endemic for tick-borne diseases (TBDs), posing a risk of co-infections in goats. To evaluate the impact of single and co-infection with T. ovis and A. ovis on caprine health, four grou...

A newly discovered zoonotic infection carried by ixodid ticks, Anaplasma capra, affects a wide variety of hosts, including numerous mammals. A. capra most likely infects erythrocytes or endothelial cells in mammals. This study aimed to investigate the A. capra pathogen in goats in Türkiye’s Van province. A total of 200 goat blood samples were exami...

The present study was designed to investigate the changes at the levels of total sialic acid (TSA), lipid-bound sialic acid (LSA), trace and macroelements, and some biochemical parameters in dogs naturally infected with babesiosis. While babesiosis group consisted of seven dogs which were diagnosed with babesiosis clinically and parasitologically (...

Neospora caninum is recognized worldwide as one of the most important abortive pathogens in cattle. Although abortion cases are also recorded in sheep and goats, information and epidemiological data on neosporosis in goats are insufficient. In Türkiye, neosporosis in goats has been serologically detected in Adana, Antalya, Ankara, Burdur, Elazig, E...

Introduction We evaluated metagenomic nanopore sequencing (NS) in field-collected ticks and compared findings from amplification-based assays. Methods Forty tick pools collected in Anatolia, Turkey and screened by broad-range or nested polymerase chain reaction (PCR) for Crimean-Congo Hemorrhagic Fever Virus (CCHFV) and Jingmen tick virus (JMTV) w...

Anaplasma capra infection is usually asymptomatic, but it is known to cause zoonotic tick-borne diseases. A. capra 's morphological characteristics and the types of cells infected (such as erythrocytes, monocytes, and neutrophil granulocytes) are unknown. Infection with A. capra was mostly found in ixodid ticks. There have been no studies on A. cap...

This study was designed to reveal the diagnostic efficiency of total antioxidant capacity (TAC), total oxidant capacity (TOC), oxidative stress index (OSI), thiol/disulphide homeostasis (TDH), albumin (ALB) and ischaemia-modified albumin (IMA) parameters in the assessment of oxidative stress in dogs with babesiosis. While the babesiosis group consi...

Canine hepatozoonosis is a tick-borne protozoan disease spread by hard ticks of the Ixodidae family. Although this illness has been seen in numerous locations in Türkiye, its existence in the Batman and Van provinces has yet to be confirmed. The purpose of this research was to look into canine hepatozoonosis in stray dogs from two distinct areas in...

Objective: Canine babesiosis is a tick-borne protozoal disease caused by Babesia spp., which can cause hemolytic anemia, splenomegaly, thrombocytopenia, and fever. As a result of molecular studies conducted in Turkey, the presence of B. canis, B. gibsoni, B. vogeli, B. rossi, and B. vulpes species has been revealed. To the best of our knowledge, th...

The measurement of serum sialic acid concentration is of importance to indicate damage in cells or tissues. Dirofilaria immitis causes cardiovascular, pulmonary, hepatic and kidney lesions. Therefore, present study was planned to investigate the potential changes in the levels of serum total sialic acid (TSA), lipid-bound sialic acid (LSA) and hema...

Sarcocystis species are obligate two-host protozoan parasites classified in the phylum Apicomplexa. Cattle are generally accepted to be the intermediate hosts for seven species, i.e.,. S. cruzi, S. hirsuta, S. hominis, S. bovifelis, S. bovini, S. rommeli, and S. heydorni. Since it is not possible to differentiate between some species using amplific...

Background: Anaplasma phagocytophilum is an obligate intracellular pathogen transmitted by the ticks that cause equine granulocytic anaplasmosis (EGA). This pathogen is infects predominantly blood cells, principally granulocytes and especially neutrophils. A. phagocytophilum causes an acute febrile disease in horses accompanying with lethargy, loss...

Introduction: We screened host-collected ticks for tick-borne viruses, including those recently documented as human pathogens. Methods: During 2020-2021, ticks removed form cattle, sheep, dogs, and cats in 11 provinces in 5 geographically distinct regions of Anatolia were identified, pooled, and screened using pan-nairovirus, pan-flavivirus and ind...

Echinococcus granulosus sensu lato is a zoonotic helminth with a life cycle that include of definitive hosts (dogs and wild carnivores) and intermediate hosts (usually the even-toed ungulates, Artiodactyla). Intermediate hosts become infected by ingesting the parasite eggs in contaminated food and water.Accidental intermediate hosts acquire infecti...

Objective: Equine granulocytic anaplasmosis (EGA) caused by Anaplasma phagocytophilum is a disease that generally develop characteristic high fever and a number of changes in blood such as thrombocytopenia. The main transmission of A. phagocytophilum is hard ticks through intrastadially. The aim of this study was to determine the presence of A. pha...

This study aimed to determine the prevalence and molecular characterization of Sarcocystis spp. in bovine minced meat that is sold in various grocery stores and butcher shops in Van Province of Turkey. For this purpose a total of 150 samples were obtained from İpekyolu, Tuşba, Edremit, Erciş, and Gevaş districts of Van Province in monthly periods f...

Anaplasmosis is an arthropod-borne parasitic disease that infects blood cells and frequently seen in sheep. This study was planned to evaluate inflammation marker levels in sheep infected with anaplasmosis. In this research, the blood samples used were obtained from 20 healthy and 20 Anaplasmosis sheep brought to Van Metropolitan Municipality Slaug...

Anaplasmosis, which is caused by the genus Anaplasma related to the family Anaplasmatacae in the order Rickettsiales, is an infectious disease that is seen in the mammals living in tropical and subtropical climate zones. Anaplasma ovis and A. phagocytophilum are the most remarkable species that cause anaplasmosis in goats. Anaplasmosis causes both...

This study was carried out to determine the prevalence of fasciolosis in sheep in Van province by coproantigen-ELISA and sedimentation-zinc sulphate flotation technique. Fecal samples collected from 141 sheep were examined by sedimentation-zinc sulphate flotation technique. Modified McMaster sedimentation technique was applied to the egg positive s...

Equine theileriosis is considered as a serious problem because of harmful effects on the health and performance of equids. Despite the importance of this disease, there are few studies in related to clinical pathologic changes in equine theileriosis especially in horses. In this study, the oxidative stress biomarkers, cytokines, enzymes, lipid prof...

Equine Piroplasmosis (EP) is a tick-borne disease caused by Theileria equi and Babesia caballi of the phylum Apicomplexa. In this study, 102 blood samples were randomly collected from the horses in Mus province of Turkey. PCR analysis, gene sequences, and phylogenetic analyses were carried out for detecting the presence and geno-typic characteristi...

Anaplasma phagocytophilum causes high-grade fever in humans, ruminants, horses, cats, and dogs. A. phagocytophilum, which causes granulocytic anaplasmosis in dogs, has a wide geographical distribution in the world, but there are not many studies on the Anaplasma species in dogs in Turkey. A. phagocytophilum, which infects leukocytes in dog, might a...

Background: Besnoitiosis caused by Besnoitia besnoiti is regarded as a re-emerging disease in cattle because of the increased number of cases and geographical distribution in many European countries. Aims: The present study was conducted to determine the presence of B. besnoiti in cattle in the Eastern and Southeastern Anatolia of Turkey. Metho...

Equine piroplasmosis (EP) is a tick-borne protozoal disease of horses, mules, donkeys, and zebras that is characterized by fever, anemia, icterus, and hepatosplenomegaly. This study was carried out to determine the seroprevalence of Theileria equi and Babesia caballi in horses in Mus province by cELISA. For this aim between June and August of 2017,...

This study was conducted to determine the prevalence of lungworm in lungs with macroscopically verminous pneumonia and in sheep with respiratory syndrome in Van province. For this purpose, 120 sheep lungs and 120 sheep feces were examined. Prevalence of lungworm infection was 85% and 62.5% by coproscopy and necropsy, respectively. Cystocaulus ocrea...

Introduction:Echinococcus granulosus is a zoonotic helminth of the Taeniidae family living in the small intestines of dogs. The hydatid cyst, which is the larval form of this parasite, is observed in sheep, goat, cattle, and many other organisms including humans. It causes a disease called cystic echinococcosis. Identification of strains of E. gran...

Introduction:Toxocara canis and Toxocara cati are roundworms of dogs and cats. The purpose of this study was to investigate the infection caused by these ascarids in cats and dogs, using microscopic and molecular analysis methods. Material and Methods: Adult ascarids were gathered from the faeces of dogs and cats in Van province, in 2015–2016. Exis...

This study aimed to determine the presence and prevalence of viral and parasitic infections causing high rates of colony loss in honey bee colonies in Van province, eastern Turkey. Twenty-six different apiaries were collected from five counties in Van province. These samples were tested by Reverse-Transcriptase PCR (RT-PCR) for acute bee paralysis...

Background: Toxocara vitulorum is a involved in the Ascaridoidea family and is a large roundworm with a semi translucent, soft body surface and pinkish color. Female worms measure 8-30cm in length, male worms 6-25cm. The major hosts of T.vitulorum are buffalo (Bubalus bubalis) and cattle (Bos species) in the humid tropics of Asia, Africa and South...

This study was undertaken to investigate the effects of theileriosis on the cardiovascular system in cattle. Blood samples were collected from 50 cattle naturally infected with Theileria spp. (before and after treatment) as well as from 30 non-infected cattle. Hematological parameters and the serum concentrations of total cardiac troponin I (cTnI),...

Rikettsiales dizisi, Anaplasmatacae ailesindeki Anaplasma türlerinin meydana getirdiği anaplasmosis, tropik ve subtropik iklim bölgelerindeki memeli hayvanlarda görülen enfeksiyöz bir hastalıktır. Sığır anaplasmosisi genellikle Anaplasma marginale ile ilişkilendirilir ve bu hastalık hem kan emici sinekler ile mekanik hem de keneler ile biyolojik yo...

A dead mallard duck (Anas platyrhynchos) was found in the Ercek district of Van province and was brought into Parasitology Department of Yuzuncu Yıl University. After the necropsy, some acanthocephalans were found in the intestinal wall of the mallard duck. Acanthocephalans were identified as Plagiorhynchus spp. according to their morphological pec...

Background: Fasciolosis is an important food borne zoonotic disease caused by Fasciola trematode parasites. There are two types of Fasciola spp. namely F. hepatica and F. gigantica, widely distributed across the globe, affecting both human and animal hosts. In endemic regions, it is possible to base the diagnosis of fasciolosis on clinical signs an...

Background Ticks are involved with the transmission of several viruses with significant health impact. As incidences of tick-borne viral infections are rising, several novel and divergent tick- associated viruses have recently been documented to exist and circulate worldwide. This study was performed as a cross-sectional screening for all major tic...

Cockroaches are claimed to be mechanical vectors of microorganisms such as intestinal parasites, bacteria, fungi, and viruses. This study was conducted to determine the potential role of cockroaches as carriers of parasites having medical importance in Van province, Turkey. One hundred and thirty-eight cockroaches were collected from different part...

This study was planned to determine the prevalences of the Nosema spp. and the black queen-cell virus (BQCV) among honeybees (Apis mellifera) raised in the province of Van by PCR and to determine the molecular characteristics of the determined isolates. A total of 260 adult worker bees from 26 colonies at 5 apiary locations belonging to the provinc...

Ticks are obligatory blood-sucking arthropods that have an important role in human and animal health. They are potential vectors of a wide range of pathogenic microorganisms, including protozoal, rickettsial, bacterial, and viral microorganisms. This study was conducted to determine tick infestation rate of cattle in the Eastern Anatolia Region of...

Aim: In wild and domestic birds, cryptosporidiosis is often associated with infections by Cryptosporidium galli, Cryptosporidium baileyi and Cryptosporidium meleagridis. A study was conducted to elucidate the prevalence of Cryptosporidium oocysts in free-living wild birds in Van, Turkey. Materials and Methods: Faecal samples were collected from 127...

Stomoxys sinekleri, çiftlik hayvanlarının ve bazen de insanların deri ve kanlarında yaşayan pek çok patojen için mekanik vektörlük yapmaktadır. İmmun sistem baskılayıcı etkileri yanında, kan kaybı, stres, iştah kaybı, deri lezyonlarına yol açar ve hayvanları oldukça rahatsız ederler. Hayvanların bu sineklerden kendilerini korumak için bir araya top...

Stomoxys sinekleri, çiftlik hayvanlarının ve bazen de insanların deri ve kanlarında yaşayan pek çok patojen için mekanik vektörlük yapmaktadır. İmmun sistem baskılayıcı etkileri yanında, kan kaybı, stres, iştah kaybı, deri lezyonlarına yol açar ve hayvanları oldukça rahatsız ederler. Hayvanların bu sineklerden kendilerini korumak için bir araya top...

Ascariasis is a disease in dogs that is caused by the nematodes Toxocara canis and Toxascaris leonina. In this study, 20 female stray dogs naturaly infected with T. canis and T. leonina and 10 healthy owned female dogs (control) were used as material. Blood and faecal samples were collected from infected and control groups. Coprological samples wer...

Whooper swan Cygnus cygnus (Linnaeus, 1758) with wounded wing that found in the Ercis district of Van province was brought into Directorship of Wild Animal Protection of University of Yuzuncu Yıl. Despite the surgical interventions, the whooper swan could not be rescued. Five lice in the feather and three nematodes in the heart were found at examin...

Ticks are considered significant in veterinary, either by acting as vectors of serious pathogens. The present study was carried out to survey ticks those infesting red hawk. A wounded red hawk was brought to the veterinary surgery clinic in Van, July 2010 with the complaint of injury. On examination, around the eyes of red hawk, 11 adult ticks (11...

This study was conducted on 35 horses living in the regions close to the eastern border of Van and used as pack animals and died from various causes. After necropsy, oesophagus and diaphragm samples were examined with trypsin method. 27 (77.1%) of the horses were infected with Sarcocystis sp. cysts. The microscopic examination revealed that 23 (65....

Objective: The purpose of this study on cattle and sheep slaughtered in the Van Local Slaughterhouse, in which some metacestodes were found (Cysticercus tenuicollis, Cyst hydatid), was to determine the status and the prevalence of these parasites which are still widely seen in various regions of Turkey and to determine the distribution of internal...

Objective: The importance for the health of cattle Hypodermosis (Nokra) species that cause disease by Polymerase Chain Reaction- Restriction Fragment Length Polymorphism (PCR-RFLP) method was investigated. Methods: The molecular analysis of Hypoderma species specific sequences located on the Cytochrome C Oxidase I (COI) (mtDNA) gene by PCR-RFLP...

ZET Bu çalışma 2005-2006 yılları arasında Van gölü kıyısında ve adalarında yaşayan martıların ektoparazitlerini tespit etmek için yapılmıştır. Bu amaçla 10 hasta ve 5 yeni ölmüş martı incelenmiş ve 15 martının 11'inde bit enfestasyonu tespit edilmiştir. Enfeste martılardan toplam 88 bit toplanmış ve toplanan bitler %70'lik alkol bulunan şişelere ko...

zbiligi/Amaç: Van'ın Özalp ilçesinde bulunan bir veteriner kliniğine genel durum bozukluğu ve yaralanma şikâyetiyle getirilen German Shepherd cinsi bir erkek köpeğin ense kısmındaki yaranın muayenesinde 120 adet myiasis larvalarına rastlanılmıştır. Materyal ve Metot: Bu larvalar bulundukları yerlerden toplandıktan sonra ağız parçaları ve posterior...