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Papers by Helga Gerlach

Research paper thumbnail of Ein Beitrag zur Differenzierung gram-negativer, anaerober, sporenloser Stäbchen aus dem Darm verschiedener Vogelarten

Zentralblatt für Veterinärmedizin Reihe B, 1981

... GET ACCESS. Subscribe / Renew. Ein Beitrag zur Differenzierung gram-negativer, anaerober, spo... more ... GET ACCESS. Subscribe / Renew. Ein Beitrag zur Differenzierung gram-negativer, anaerober, sporenloser Stäbchen aus dem Darm verschiedener Vogelarten. Dr. med. vet. Christiane Spaeter,;Dr. med. vet. habil. Helga Gerlach. Article first published online: 13 MAY 2010. ...

Research paper thumbnail of Endoscopic Testicular Biopsy Technique in Psittaciformes

Journal of Avian Medicine and Surgery, 2002

... Verdauungsapparat (Apparatus digestorius). In: König HE, Liebich HG, eds. ... Maria Hänse Vet... more ... Verdauungsapparat (Apparatus digestorius). In: König HE, Liebich HG, eds. ... Maria Hänse VetMed, Volker Schmidt Dr MedVet, Dipl ECAMS, Susanne Schneider VetMed, Angelique DellaVolpe VetMed, and Maria-Elisabeth Krautwald-Junghanns Prof Dr MedVet, Dipl ECAMS. ...

Research paper thumbnail of Occurrence of avian bornavirus infection in captive psittacines in various European countries and its association with proventricular dilatation disease

Research paper thumbnail of 7th Avian Pathology Forum

Research paper thumbnail of Aviäre Mykobakteriose durch bisher nicht identifizierbare Stämme

Research paper thumbnail of On the Importance of Bacterial L-Forms in Pigeons

Following a definition of bacterial L-forms and a literature review on introduction and reversion... more Following a definition of bacterial L-forms and a literature review on introduction and reversion of bacteria to and from L-forms, respectively, the results of a study comprising 587 samples (316 pigeons and 271 pigeon eggs) are reported. As a control 25 free living pigeons and 25 eggs of those pigeons were used, because antibiotic treatment of these could be excluded. From 79 samples (75 pigeons and 4 eggs) Salmonella typhimurium var. copenhagen (STMC) was isolated (none from the urban pigeons), of them 11 in the L-form from joints and organs and 3 from eggs. 325 of other bacterial isolates were found as L-forms (= approx. 40%). Out of 168 serum samples investigated, 33.9% showed antibodies against STMC. Corresponding antibodies could only be demonstrated in 73.4% of the pigeons with a STMC isolate. The occurrence of L-forms explains resistance to therapy and the failure of vaccines. The high frequency of L-forms is probably an indication of an inconsequential use of antibiotics in managing pigeon diseases.

Research paper thumbnail of Investigations on the Aerobic Flora and Clostridium perfringens in Fecal Specimens from Free-living and Captive Capercaillies (Tetrao urogallus L., 1758)

Journal of Veterinary Medicine, Series B, 2000

Research paper thumbnail of Physiology, diagnosis, and diseases of the avian reproductive tract

Veterinary Clinics of North America: Exotic Animal Practice, 2003

Research paper thumbnail of Investigation of several selected adjuvants regarding their efficacy and side effects for the production of a vaccine for parakeets to prevent a disease caused by a paramyxovirus type 3

Research paper thumbnail of Nucleotide sequence analysis of a C1 gene fragment of psittacine beak and feather disease virus amplified by real-time polymerase chain reaction indicates a possible existence of genotypes

Avian Pathology, 2004

To investigate sequence diversity of psittacine beak and feather disease virus, samples collected... more To investigate sequence diversity of psittacine beak and feather disease virus, samples collected from 31 psittacine species with or without clinical signs were tested for the presence of the viral genome. A real-time polymerase chain reaction was developed amplifying a 202 base pair fragment of the region encoding the capsid protein C1 and detecting 100 to 1000 genome equivalents. The nucleotide sequences of the polymerase chain reaction products showed 84.1 to 100% identity with no consistent pattern with regard to the infected bird species. Amino acid exchanges were concentrated mainly in five of the 42 deduced positions. Sequences obtained from an outbreak of acute beak and feather disease in lories clustered in a separate branch of a phylogenetic tree. Sequences in samples from African grey parrots with feather disorders grouped together, whereas those from the same species with immunosuppression clustered in other branches. These results indicate the possible existence of beak and feather disease virus genotypes.

Research paper thumbnail of Phylogenetic analysis of the hexon loop 1 region of an adenovirus from psittacine birds supports the existence of a new psittacine adenovirus (PsAdV)

Archives of Virology, 2005

Adenovirus infections in psittacine birds have been well known. Most of these infections were cau... more Adenovirus infections in psittacine birds have been well known. Most of these infections were caused by fowl adenoviruses (FAdV). In this study, liver samples showing typical histological signs of an adenovirus infection were collected from Poicephalus spp. with acute disease. A PCR amplifying the variable loop 1 region of the hexon gene was developed using primers located in two conserved pedestal regions. A PCR product of approximately 590 bp in size was amplified and sequenced. The sequence obtained grouped outside of the FAdV reference strains of the 12 serotypes as well as egg drop syndrome virus and turkey adenovirus 3 indicating that a new avian adenovirus was detected. In comparison to the FAdV reference strains, the percentage of identical nucleotides ranged between 60.3 and 67.0 and that of identical amino acids (aa) between 51.3 and 61.0. Furthermore, 37 unique aa exchanges were observed; out of these, 27 are located in the 4 hypervariable regions of loop 1, which encode the serotype-specific epitopes. The g/c content, the isoelectric point and the charge of the amplified fragment, however, are in the range as those of group I avian adenoviruses. It was proposed, therefore, to designate this new adenovirus as psittacine adenovirus (PsAdV).

Research paper thumbnail of Herpesviral, but no papovaviral sequences, are detected in cloacal papillomas of parrots

Archives of Virology, 2002

Research paper thumbnail of Investigations on the aetiology of pinching off syndrome in four white-tailed sea eagles ( Haliaeetus albicilla ) from Germany

Research paper thumbnail of Ein Beitrag zur Differenzierung gram-negativer, anaerober, sporenloser Stäbchen aus dem Darm verschiedener Vogelarten

Zentralblatt für Veterinärmedizin Reihe B, 1981

... GET ACCESS. Subscribe / Renew. Ein Beitrag zur Differenzierung gram-negativer, anaerober, spo... more ... GET ACCESS. Subscribe / Renew. Ein Beitrag zur Differenzierung gram-negativer, anaerober, sporenloser Stäbchen aus dem Darm verschiedener Vogelarten. Dr. med. vet. Christiane Spaeter,;Dr. med. vet. habil. Helga Gerlach. Article first published online: 13 MAY 2010. ...

Research paper thumbnail of Endoscopic Testicular Biopsy Technique in Psittaciformes

Journal of Avian Medicine and Surgery, 2002

... Verdauungsapparat (Apparatus digestorius). In: König HE, Liebich HG, eds. ... Maria Hänse Vet... more ... Verdauungsapparat (Apparatus digestorius). In: König HE, Liebich HG, eds. ... Maria Hänse VetMed, Volker Schmidt Dr MedVet, Dipl ECAMS, Susanne Schneider VetMed, Angelique DellaVolpe VetMed, and Maria-Elisabeth Krautwald-Junghanns Prof Dr MedVet, Dipl ECAMS. ...

Research paper thumbnail of Occurrence of avian bornavirus infection in captive psittacines in various European countries and its association with proventricular dilatation disease

Research paper thumbnail of 7th Avian Pathology Forum

Research paper thumbnail of Aviäre Mykobakteriose durch bisher nicht identifizierbare Stämme

Research paper thumbnail of On the Importance of Bacterial L-Forms in Pigeons

Following a definition of bacterial L-forms and a literature review on introduction and reversion... more Following a definition of bacterial L-forms and a literature review on introduction and reversion of bacteria to and from L-forms, respectively, the results of a study comprising 587 samples (316 pigeons and 271 pigeon eggs) are reported. As a control 25 free living pigeons and 25 eggs of those pigeons were used, because antibiotic treatment of these could be excluded. From 79 samples (75 pigeons and 4 eggs) Salmonella typhimurium var. copenhagen (STMC) was isolated (none from the urban pigeons), of them 11 in the L-form from joints and organs and 3 from eggs. 325 of other bacterial isolates were found as L-forms (= approx. 40%). Out of 168 serum samples investigated, 33.9% showed antibodies against STMC. Corresponding antibodies could only be demonstrated in 73.4% of the pigeons with a STMC isolate. The occurrence of L-forms explains resistance to therapy and the failure of vaccines. The high frequency of L-forms is probably an indication of an inconsequential use of antibiotics in managing pigeon diseases.

Research paper thumbnail of Investigations on the Aerobic Flora and Clostridium perfringens in Fecal Specimens from Free-living and Captive Capercaillies (Tetrao urogallus L., 1758)

Journal of Veterinary Medicine, Series B, 2000

Research paper thumbnail of Physiology, diagnosis, and diseases of the avian reproductive tract

Veterinary Clinics of North America: Exotic Animal Practice, 2003

Research paper thumbnail of Investigation of several selected adjuvants regarding their efficacy and side effects for the production of a vaccine for parakeets to prevent a disease caused by a paramyxovirus type 3

Research paper thumbnail of Nucleotide sequence analysis of a C1 gene fragment of psittacine beak and feather disease virus amplified by real-time polymerase chain reaction indicates a possible existence of genotypes

Avian Pathology, 2004

To investigate sequence diversity of psittacine beak and feather disease virus, samples collected... more To investigate sequence diversity of psittacine beak and feather disease virus, samples collected from 31 psittacine species with or without clinical signs were tested for the presence of the viral genome. A real-time polymerase chain reaction was developed amplifying a 202 base pair fragment of the region encoding the capsid protein C1 and detecting 100 to 1000 genome equivalents. The nucleotide sequences of the polymerase chain reaction products showed 84.1 to 100% identity with no consistent pattern with regard to the infected bird species. Amino acid exchanges were concentrated mainly in five of the 42 deduced positions. Sequences obtained from an outbreak of acute beak and feather disease in lories clustered in a separate branch of a phylogenetic tree. Sequences in samples from African grey parrots with feather disorders grouped together, whereas those from the same species with immunosuppression clustered in other branches. These results indicate the possible existence of beak and feather disease virus genotypes.

Research paper thumbnail of Phylogenetic analysis of the hexon loop 1 region of an adenovirus from psittacine birds supports the existence of a new psittacine adenovirus (PsAdV)

Archives of Virology, 2005

Adenovirus infections in psittacine birds have been well known. Most of these infections were cau... more Adenovirus infections in psittacine birds have been well known. Most of these infections were caused by fowl adenoviruses (FAdV). In this study, liver samples showing typical histological signs of an adenovirus infection were collected from Poicephalus spp. with acute disease. A PCR amplifying the variable loop 1 region of the hexon gene was developed using primers located in two conserved pedestal regions. A PCR product of approximately 590 bp in size was amplified and sequenced. The sequence obtained grouped outside of the FAdV reference strains of the 12 serotypes as well as egg drop syndrome virus and turkey adenovirus 3 indicating that a new avian adenovirus was detected. In comparison to the FAdV reference strains, the percentage of identical nucleotides ranged between 60.3 and 67.0 and that of identical amino acids (aa) between 51.3 and 61.0. Furthermore, 37 unique aa exchanges were observed; out of these, 27 are located in the 4 hypervariable regions of loop 1, which encode the serotype-specific epitopes. The g/c content, the isoelectric point and the charge of the amplified fragment, however, are in the range as those of group I avian adenoviruses. It was proposed, therefore, to designate this new adenovirus as psittacine adenovirus (PsAdV).

Research paper thumbnail of Herpesviral, but no papovaviral sequences, are detected in cloacal papillomas of parrots

Archives of Virology, 2002

Research paper thumbnail of Investigations on the aetiology of pinching off syndrome in four white-tailed sea eagles ( Haliaeetus albicilla ) from Germany

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