Olga Zorman-Rojs

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To better understand the ecology and epidemiology of the highly pathogenic avian influenza virus in its transcontinental spread, we sequenced and analyzed the complete genomes of 36 recent influenza A (H5N1) viruses collected from birds in Europe, northern Africa, and southeastern Asia. These sequences, among the first complete genomes of influenza (H5N1)(More)
In the year 2000 an epidemiological research was undertaken on the health status of free-living pigeons in the city of Ljubljana, Slovenia. A total of 139 pigeons were captured and examined for the most common bacterial, viral, and parasitic diseases. Serum samples, oropharyngeal and cloacal swabs as well as samples of droppings and feathers were taken from(More)
Maternal antibodies can protect avian embryos against vertically transmitted pathogens during embryogenesis and also young birds after hatching. In contrast to the well-known transfer of maternal immunoglobulin (Ig) G (also termed IgY) from the yolk to embryonic blood, information about the transfer of IgA, IgG and IgM from the egg albumen to the(More)
Among 23 currently recognized avian Mycoplasma (AM) species only Mycoplasma gallisepticum, Mycoplasma synoviae, Mycoplasma meleagridis and Mycoplasma iowae cause disease and loss of production in chickens and/or turkeys. Because neuraminidases are considered virulence factors in many pathogenic microorganisms the aim of our study was to determine which AM(More)
Immune reactivity for Chlamydophila (C.) psittaci in Slovenia was monitored in parrots, canaries, finches and nine species of recently captured free-living birds (house sparrows, Eurasian goldfinches, tree sparrows, chaffinches, European greenfinches, European serines, Eurasian siskins, Eurasian linnets and Eurasian bullfinches) in the period from 1991 to(More)
Major poultry pathogens, Mycoplasma gallisepticum and Mycoplasma synoviae share several genes, including nanH that encodes their sialidases (neuraminidases). Previous studies have shown considerable differences in neuraminidase enzymatic activity (NEAC) in M. synoviae strains and NEAC absence in individual cultures of two strains, ULB 925 and ULB 9122. The(More)
Neuraminidases (sialidases) are virulence factors of several poultry pathogens. Ornithobacterium rhinotracheale is a well known poultry pathogen causing respiratory disease in chickens and turkeys all over the world. We investigated whether O. rhinotracheale has neuraminidase enzymatic activity (NEAC). We tested NEAC in 47 O. rhinotracheale strains isolated(More)
Clinical outbreaks of severe acute infectious burial disease (IBD) were recorded since the mid- and late 1990s in several countries in the southeastern part of Europe. Epidemiologic data showed that both infectious bursal disease virus (IBDV)-vaccinated and IBDV-nonvaccinated chickens were affected with acute IBD and mortality up to 50% independent of the(More)
Within the framework of the surveillance program for the early detection of H5 and H7 subtypes of avian influenza (AI) viruses, samples from 2547 wild birds of different species that were collected between 2006 and 2010 were examined by PCR-based methods. AI viruses of various subtypes were detected in 4.4% of birds from four different orders: Anseriformes,(More)
In this paper, some facts have been discussed that could be important for the understanding of how the chlamydial pathogen spreads within the bird flock and to humans. The presented report has been based on pathological findings and interpretation of the results of diagnostic tests, obtained at chlamydial infection in a flock of parrots. In a twoweek(More)