'Swollen head syndrome' in broiler breeders in Israel

Perelman, B.; Meroz, M.; Samberg, Y.

doi:10.1136/vr.123.17.444

Cited by 8 publications

(4 citation statements)

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“…However, the disease could not be reproduced using aMPV alone and chicken flocks can be infected without showing clinical signs (Droual & Woolcock 1994;Al-Ankari et al, 2001). Even though a reduced laying performance is reported in broiler breeders in connection with swollen head syndrome (O'Brien, 1985;Perelman et al, 1988;Hafez & Lö hren, 1990), the effect of aMPV on the reproductive tract is still not clear. Currently, in field investigations it is often assumed that a reduced egg production could be linked with an aMPV infection, without clear evidence based on relevant diagnostic methods.…”

Section: Introductionmentioning

confidence: 94%

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Avian metapneumovirus excretion in vaccinated and non-vaccinated specified pathogen free laying chickens

Heß

Huggins²,

Mudzamiri³

et al. 2004

Avian Pathology

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Vaccinated and non-vaccinated specified pathogen-free White Leghorn laying chickens were challenged at peak of lay by the intravenous or oculonasal route with a virulent avian metapneumovirus (aMPV) subtype B chicken strain. Severe clinical signs and a drop in egg production were induced in the non-vaccinated intravenously challenged birds whereas the vaccinates were not affected. Live virus excretion was demonstrated in the faeces and respiratory tract of non-vaccinated hens for up to 7 days post intravenous challenge. After oculonasal challenge, virus excretion could only be demonstrated in the respiratory tract for up to 5 days. No live virus excretion was found in either the faeces or the respiratory tract of vaccinated birds. Concurrent with live virus isolation, the presence of viral RNA was demonstrated by single reverse transcription-polymerase chain reaction (RT-PCR). Nested RT-PCR was more sensitive and viral RNA could be detected in non-vaccinated birds up to 28 days post either intravenous or oculonasal challenge, at which time the experiment was terminated. Viral RNA was detected for up to 12 days in vaccinated birds. This is the first study investigating excretion of aMPV and viral RNA in vaccinated and non-vaccinated laying hens challenged under experimental conditions. The results are of importance with regard to the persistence of aMPV and the appropriate diagnostic detection method in laying birds.

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Section: Introductionmentioning

confidence: 94%

“…In chickens, aMPV infection is often associated with the swollen head syndrome (O'Brien, 1985;Cook et al, 1988;Perelman et al, 1988;Jones et al, 1991). However, the disease could not be reproduced using aMPV alone and chicken flocks can be infected without showing clinical signs (Droual & Woolcock 1994;Al-Ankari et al, 2001).…”

Section: Introductionmentioning

confidence: 94%

Avian metapneumovirus excretion in vaccinated and non-vaccinated specified pathogen free laying chickens

Heß

Huggins²,

Mudzamiri³

et al. 2004

Avian Pathology

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“…Thereafter, the disease was reported in England in 1985(Mc Dougall & Cook, 1986Wilding et al , 1986;Wyeth et al , 1986) and in France in 1986 (Giraud et al , 1986), where the causative virus was isolated from turkeys and chickens, and was characterized as the first avian member of the genus Pneumovirus (Cavanagh & Barrett, 1988). The disease has since been reported elsewhere throughout Europe (Cook, 2000) as well as in Israel (Perelman et al , 1988;Weisman et al , 1988), Morocco, Zimbabwe, Taiwan, Japan, Brazil (Dani et al , 1999), Central America and the US .…”

Section: Introductionmentioning

confidence: 99%

Characterization of Israeli avian metapneumovirus strains in turkeys and chickens

Banet-Noach¹,

Simanov²,

Perk³

2005

Avian Pathology

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Although the disease associated with the avian metapneumovirus (aMPV) has been described in Israel for more than 20 years and one Israeli isolate was characterized as subtype A, this is the first study investigating the strains circulating in Israel (period 2002 to 2004). Viral RNA was detected by reverse transcriptionpolymerase chain reaction in 44% of the examined flocks, and one-half of the virus isolation attempts were successful. Characterization showed that 34 non-vaccinated turkey flocks had aMPV subtype B, three had aMPV subtype A and three remained undetermined. Sequence analysis of part of the attachment protein G gene (1161 base pairs) showed a relative homogeneity within the Israeli subtype B group, although they were different from the European and vaccine strains. Seven out of 10 vaccinated flocks were reverse transcription-polymerase chain reaction-positive for aMPV, and sequence analysis of 239 base pairs of the G gene revealed that field strains and not vaccine strains were recovered from these flocks. Overall, the virological examination confirmed the high prevalence of aMPV in Israel and revealed a co-circulation of two subtypes, A and B, with aMPV subtype B being the dominant subtype.

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“…Swollen-head syndrome (SHS) is a recently described, acute respiratory disease that is observed in a variety of domestic poultry and is characterized by swelling of the periand infraorbital sinuses, torticollis, opisthotonos, and incoordination (20). Since the syndrome was described in South Africa (16), SHS or SHS-like disease has been reported in The Netherlands (11), United Kingdom (20), France (26), Spain (23), Israel (25), Germany (H. S. Hafez and U. Lohren, IXth Int. Congr.…”

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confidence: 99%

Genetic relationships among strains of avian Escherichia coli associated with swollen-head syndrome

et al. 1990

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Genetic diversity among 22 Escherichia coli strains isolated from chickens with swollen-head syndrome (SHS), an acute respiratory disease of domestic poultry, and 93 strains isolated from birds with colibacillosis was assessed on the basis of allelic variation at 20 enzyme-encoding loci detected by multilocus enzyme electrophoresis. SHS isolates from Spain and Canada were polymorphic at 14 loci and were classified into 19 multilocus genotypes, defining clones that differed on average at 34% of the loci. In most cases, SHS isolates of different clonal genotypes were distinct in O:H serotype and expressed different fimbrial antigens. Comparisons with 93 isolates obtained from birds with colibacillosis revealed enzyme polymorphisms at 17 of 20 loci, with an average of 3.5 alleles per locus. In the total sample, 56 clonal genotypes were distinguished, with 27 (23%) of the isolates belonging to one of three common clones. Both SHS and colibacillosis isolates were genetically diverse, with an average single-locus diversity of 0.36, indicating that a wide variety of naturally occurring bacterial clones is associated with these acute avian infections. Six previously defined groups of clones identified in diseased birds from the United States were represented in isolates from Spain, indicating that similar clones occur in widely separated geographic areas. In addition, one group of SHS isolates was closely related to a recognized widespread clone complex incriminated in human septicemia and meningitis. The results suggest that certain strains implicated in SHS infections belong to a clone complex whose members have special attributes that promote involvement in invasive diseases in humans and animals.

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'Swollen head syndrome' in broiler breeders in Israel

Cited by 8 publications

References 0 publications

Avian metapneumovirus excretion in vaccinated and non-vaccinated specified pathogen free laying chickens

Avian metapneumovirus excretion in vaccinated and non-vaccinated specified pathogen free laying chickens

Characterization of Israeli avian metapneumovirus strains in turkeys and chickens

Genetic relationships among strains of avian Escherichia coli associated with swollen-head syndrome

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