Effect of changes of vaccination strategies on IBV epidemiology, diagnosis and control: an Italian retrospective study
Veterinaria Italiana
; 58(1):41-45, 2022.
Article
Dans Anglais
| CAB Abstracts | ID: covidwho-20238514
ABSTRACT
Infectious bronchitis virus (IBV) is among the most impactful poultry pathogens, whose control, based on biosecurity and routine vaccination, is hampered by the existence of countless genetic variants sharing poor cross-protection. A retrospective study was conducted on IBV positive samples collected in Italian broiler farms from 2012 to 2019. In 2015, the adopted vaccination protocol shifted from a Mass and 793B-based vaccines to the administration of Mass and QX vaccines, allowing to study how changes in vaccination strategies may affect IBV epidemiology, control and diagnosis in the field. The most frequently detected lineages were QX (70.3%), 793B (15.8%) and Mass (11.9%). The relative frequencies of QX and 793B detections remained stable throughout the study, while Mass detections significantly increased after the vaccination change. Rather than to an actual growth of Mass population size, this finding may be attributable to different vaccine interactions, with Mass strains being more frequently concealed by 793B vaccines than by QX ones. Based on the obtained results, the two vaccination protocols appear to be similarly effective in fighting IB outbreaks, which in the last decade have been caused primarily by QX field strains in Italy. These results indicate that vaccination strategies may significantly affect IBV epidemiology and diagnosis, and should therefore be considered when choosing and interpreting diagnostic assays and planning control measures.
Host Resistance and Immunity [HH600]; Prion; Viral; Bacterial and Fungal Pathogens of Animals [LL821]; Animal Immunology [LL650]; Diagnosis of Animal Diseases [LL886]; vaccination; epidemiology; vaccines; disease prevention; disease control; diagnosis; broilers; poultry; avian infectious bronchitis; Infectious bronchitis virus; fowls; Italy; Avian coronavirus; Gammacoronavirus; Coronavirinae; Coronaviridae; Nidovirales; positive-sense ssRNA Viruses; ssRNA Viruses; RNA Viruses; viruses; European Union Countries; high income countries; Mediterranean Region; OECD Countries; Southern Europe; Europe; very high Human Development Index countries; Gallus gallus; Gallus; Phasianidae; Galliformes; birds; vertebrates; Chordata; animals; eukaryotes; biosecurity; IBV infection; chickens; domesticated birds
Collection:
Bases de données des oragnisations internationales
Base de données:
CAB Abstracts
Type d'étude:
Études expérimentales
/
Étude observationnelle
/
Essai contrôlé randomisé
Les sujets:
Vaccins
/
Variantes
langue:
Anglais
Revue:
Veterinaria Italiana
Année:
2022
Type de document:
Article
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