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Active Surveillance for Highly Pathogenic Avian Influenza Viruses in Wintering Waterbirds in Northeast Italy, 2020–2021
- Source :
- Microorganisms, Microorganisms, Vol 9, Iss 2188, p 2188 (2021), Volume 9, Issue 11
- Publication Year :
- 2021
- Publisher :
- Zenodo, 2021.
-
Abstract
- The increasing involvement of wild waterfowl in H5 Highly Pathogenic Avian Influenza Virus (HPAIV) circulation continues to pose a threat to animal and public health worldwide. In winter 2020–2021, two field surveillance activities were carried out on a weekly basis, through virological and serological analyses, in 823 hunted and 521 trapped migratory aquatic birds in northeast Italy. Sixty Eurasian teals were recaptured several times, which allowed us to follow the progression of the HPAI H5 infection in naturally infected wild waterfowl. Oropharyngeal, cloacal, and feather swabs (OS, CS and FS) were collected from each duck and tested by real time rRT-PCR Type A influenza. The identified viruses were characterized and pathotyped by sequencing. Several viruses belonging to three different HPAI H5 subtypes were detected: H5N8, H5N5, and H5N1. High prevalence of infection with HPAI H5 clade 2.3.4.4b during November–December 2020 (up to 27.1%) was observed in captured Eurasian teals, while infection rates in hunted dabbling ducks, mainly Eurasian wigeons, showed the highest prevalence of infection in November 2020 (8.9%) and January 2021 (10.2%). All HPAI positive birds were also clinically healthy when recaptured weeks apart. The OS and FS showed the highest detection efficiency of HPAIV. Our results highlight that HPAI passive surveillance should be complemented by a targeted active surveillance to more efficiently detect novel HPAI viruses
- Subjects :
- Microbiology (medical)
Veterinary medicine
QH301-705.5
Highly pathogenic
viruses
animal diseases
avian influenza virus
Biology
medicine.disease_cause
HPAI H5 subtypes clade 2.3.4.4b
Microbiology
Article
Serology
Avian Influenza Viru
03 medical and health sciences
Virology
medicine
Waterfowl
Biology (General)
Clade
030304 developmental biology
0303 health sciences
High prevalence
030306 microbiology
active surveillance
virus diseases
biology.organism_classification
Influenza A virus subtype H5N1
3. Good health
Highly Pathogenic Avian Influenza Virus
Feather
visual_art
migratory aquatic bird
visual_art.visual_art_medium
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Microorganisms, Microorganisms, Vol 9, Iss 2188, p 2188 (2021), Volume 9, Issue 11
- Accession number :
- edsair.doi.dedup.....81e706b777a06618eb43ca23544e79cc