Listar por autor "Leontides, L."
Mostrando ítems 1-20 de 63
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Abortion in ewes associated with Erysipelothrix rhusiopathiae
Fthenakis, G. C.; Christodoulopoulos, G.; Leontides, L.; Tzora, A. (2006)We describe the features of an outbreak of ovine abortions caused by Erysipelothrix rhusiopathiae in a flock of sheep in Greece. Abortion occurred in 3.5% of ewes in the flock; the foetuses were well developed and had ... -
Age, FSH dose and follicular aspiration frequency affect oocyte yield from juvenile donor lambs
Valasi, I.; Leontides, L.; Papanikolaou, T.; Amiridis, G. S. (2007)Experiments were conducted to determine the effects of lamb age, frequency of follicular aspirations, and hormone stimulation by fixed or variable FSH dose, on the number of collected oocytes and their maturational competence. ... -
Anti-Hepatozoon canis serum antibodies and gamonts in naturally-occurring canine monocytic ehrlichiosis
Mylonakis, M. E.; Leontides, L.; Gonen, L.; Billinis, C.; Koutinas, A. F.; Baneth, G. (2005)The prevalence of IgG antibodies to Hepatozoon canis and the presence of gamonts in the blood and hemolymphatic tissues were studied in dogs with canine monocytic ehrlichiosis (CME) caused by Ehrlichia canis. Both pathogens ... -
Application of a semi-dependent latent model in the Bayesian estimation of the sensitivity and specificity of two faecal culture methods for diagnosis of paratuberculosis in sub-clinically infected Greek dairy sheep and goats
Kostoulas, P.; Leontides, L.; Billinis, C.; Florou, M. (2006)In this study, we compared the frequency of isolation of Mycobacterium avium subsp. paratuberculosis (MAP) from faecal samples grown on Herrold's egg-yolk medium (HEYM) or on Lowenstein-Jensen (LJ) medium and estimated the ... -
The association of sub-clinical paratuberculosis with the fertility of Greek dairy ewes and goats varies with parity
Kostoulas, P.; Leontides, L.; Billinis, C.; Amiridis, G. S.; Florou, M. (2006)Our cross-sectional study investigated the association of sub-clinical Mycobacterium avium subsp. paratuberculosis (MAP) infection with failing to produce a live offspring the season of lambing/kidding (November 2001 to ... -
Associations between claw lesions and reproductive performance of sows in three Greek herds
Lisgara, M.; Skampardonis, V.; Angelidou, E.; Kouroupides, S.; Leontides, L. (2015)Claw lesions, which are nowadays very common in sows, are associated with a high risk of early culling and compromised welfare. In this study, we investigated the associations between the severity of claw lesions and three ... -
Bayesian estimation of sensitivity and specificity of serum ELISA and faecal culture for diagnosis of paratuberculosis in Greek dairy sheep and goats
Kostoulas, P.; Leontides, L.; Enoe, C.; Billinis, C.; Florou, M.; Sofia, M. (2006)Latent class models were used to estimate the sensitivity (Se) and the specificity (Sp) of a serum ELISA and a faecal culture (FC) method for the diagnosis of paratuberculosis separately, in sheep and goats. The estimates ... -
Bayesian estimation of the true prevalence of Mycobacterium avium subsp paratuberculosis infection in Cypriot dairy sheep and goat flocks
Liapi, M.; Leontides, L.; Kostoulas, P.; Botsaris, G.; Iacovou, Y.; Rees, C.; Georgiou, K.; Smith, G. C.; Naseby, D. C. (2011)We estimated the prevalence of Mycobacterium avium subsp. paratuberculosis (MAP) infected sheep and goats, older than 2 years, reared in the region effectively controlled by the Government of the Republic of Cyprus, in ... -
Bayesian estimation of variance partition coefficients adjusted for imperfect test sensitivity and specificity
Kostoulas, P.; Leontides, L.; Browne, W. J.; Gardner, I. A. (2009)The variance partition coefficient (VPC) measures the clustering of infection/disease among individuals with a specific covariate pattern. Covariate-pattern-specific VPCs provide insight to the groups of individuals that ... -
Bayesian mixture models for partially verified data: Age- and stage-specific discriminatory power of an antibody ELISA for paratuberculosis
Kostoulas, P.; Browne, W. J.; Nielsen, S. S.; Leontides, L. (2013)Bayesian mixture models can be used to discriminate between the distributions of continuous test responses for different infection stages. These models are particularly useful in case of chronic infections with a long ... -
Bayesian validation of a serum and milk ELISA for antibodies against Mycobacterium avium subspecies paratuberculosis in Greek dairy goats across lactation
Angelidou, E.; Kostoulas, P.; Leontides, L. (2014)We validated a commercial (Idexx Pourquier, Montpellier, France) serum and milk indirect ELISA that detects antibodies against Mycobacterium avium ssp. paratuberculosis (MAP) in Greek dairy goats. Each goat was sampled 4 ... -
A Bayesian Weibull survival model for time to infection data measured with delay
Kostoulas, P.; Nielsen, S. S.; Browne, W. J.; Leontides, L. (2010)Survival analysis methods can be used to identify factors associated with the time to induction of infection In the absence of a perfect test, detection of infection is generally delayed and depends on the duration of the ... -
Case report: High prevalence rate of ovine mastitis, caused by coagulase-negative staphylococci and predisposed by increased gossypol consumption
Fthenakis, G. C.; Leontides, L.; Skoufos, J.; Taitzoglou, I. A.; Tzora, A. (2004)A case of unusually high (>94%) prevalence of mastitis in a flock of dairy sheep, which was caused by coagulase-negative staphylococci (cnS) and associated with increased gossypol consumption, is presented. The animals ... -
Comparative methodology for the detection and differentiation of circulating microfilariae of Dirofilaria immitis in the dog
Mylonakis, M. E.; Papadopoulos, E.; Koutinas, A. F.; Paitaki, C.; Leontides, L. (2004)The sensitivities of the Knott's test (four 20-mul sediment aliquots), quantitative buffy coat capillary tube method (QBC tube, 111 mul of whole blood) and direct blood smear (DBS, 20 mul of whole blood) were evaluated for ... -
A cross-sectional study of the seroprevalence and flock-level factors associated with ovine and caprine brucellosis in southeastern Iran
Sharifi, H.; Tabatabaei, S.; Rashidi, H.; Kazeminia, S.; Sabbagh, F.; Khajooei, P.; Karamouzian, M.; Nekouei, O.; Adeli Sardooei, M.; Leontides, L. (2014)This cross-sectional study was conducted to estimate seroprevalence and to identify flock-level factors associated with seropositivity to brucellosis in small ruminants in Kerman province, southeastern Iran. In October-November ... -
Cytologic patterns of lymphadenopathy in canine monocytic ehrlichiosis
Mylonakis, M. E.; Borjesson, D. L.; Leontides, L.; Siarkou, V. I.; Theodorou, K.; Koutinas, A. F. (2011)Background Recognition of different cytologic patterns in lymph nodes (LNs) from dogs with canine monocytic ehrlichiosis (CME) and noninfectious causes of lymphoid reactivity may have diagnostic utility. Objectives The ... -
Cytological and molecular detection of Leishmania infantum in different tissues of clinically normal and sick cats
Chatzis, M. K.; Andreadou, M.; Leontides, L.; Kasabalis, D.; Mylonakis, M.; Koutinas, A. F.; Rallis, T.; Ikonomopoulos, J.; Saridomichelakis, M. N. (2014)Natural infection of domestic cats by Leishmania infantum (synonym: L chagasi) has been demonstrated in several European, Latin American, and Asian countries, and the estimated prevalence of infection, based mainly on blood ... -
DETECTION AND GENETIC CHARACTERIZATION OF PORCINE CIRCOVIRUS 2 ISOLATES FROM THE FIRST CASES OF POSTWEANING MULTISYSTEMIC AND WASTING SYNDROME IN WILD BOARS IN GREECE
Sofia, M.; Billinis, C.; Psychas, V.; Birtsas, P.; Sofianidis, G.; Leontides, L.; Knowles, N.; Spyrou, V. (2008)In 2002, postweaning multisystemic wasting syndrome (PMWS) was diagnosed in a European female wild boar (Sus scrofa), based on the detection of porcine circovirus 2 (PCV2) DNA in various organs, including the uterus, and ... -
Dust mite species in the households of mite-sensitive dogs with atopic dermatitis
Farmaki, R.; Saridomichelakis, M. N.; Leontides, L.; Papazahariadou, M. G.; Gioulekas, D.; Koutinas, A. F. (2012)Background The presence of important house dust and storage mite species in the microenvironment of atopic dogs has not been thoroughly investigated. Objectives To compare the presence and population of five dust mite ... -
Effect of anticoagulant and storage conditions on platelet size and clumping in healthy dogs
Mylonakis, M. E.; Leontides, L.; Farmaki, R.; Kostoulas, P.; Koutinas, A. F.; Christopher, M. (2008)The potential impact of preanalytical factors, such as type of anticoagulant, storage temperature, and time, on the formation of macroplatelets and platelet aggregates (platelet clumping) in dogs is largely elusive. The ...