Pigs are highly susceptible to but do not transmit mink-derived highly pathogenic avian influenza virus H5N1 clade 2.3.4.4b.

Taeyong Kwon1 Jessie D Trujillo1 Mariano Carossino2 Eu Lim Lyoo1 Chester D McDowell1 Konner Cool1 Franco S Matias-Ferreyra1 Trushar Jeevan3 Igor Morozov1 Natasha N Gaudreault1 Udeni B R Balasuriya2 Richard J Webby3 Nikolaus Osterrieder1 Juergen A Richt1
Affiliations 3 institutions
  1. Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, USA.
  2. Louisiana Animal Disease Diagnostic Laboratory and Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA, USA.
  3. Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN, USA.

Abstract

ABSTRACTRapid evolution of highly pathogenic avian influenza viruses (HPAIVs) is driven by antigenic drift but also by reassortment, which might result in robust replication in and transmission to mammals. Recently, spillover of clade 2.3.4.4b HPAIV to mammals including humans, and their transmission between mammalian species has been reported. This study aimed to evaluate the pathogenicity and transmissibility of a mink-derived clade 2.3.4.4b H5N1 HPAIV isolate from Spain in pigs. Experimental infection caused interstitial pneumonia with necrotizing bronchiolitis with high titers of virus present in the lower respiratory tract and 100% seroconversion. Infected pigs shed limited amount of virus, and importantly, there was no transmission to contact pigs. Notably, critical mammalian-like adaptations such as PB2-E627 K and HA-Q222L emerged at low frequencies in principal-infected pigs. It is concluded that pigs are highly susceptible to infection with the mink-derived clade 2.3.4.4b H5N1 HPAIV and provide a favorable environment for HPAIV to acquire mammalian-like adaptations.

Supporting text Virus Host Location
clade 2.3.4.4b 19 H5N1 82 highly pathogenic avian influenza virus 13 mammalian-like adaptations, mink isolate, transmission 1 Pigs 12 Influenza A Virus, H5N1 Subtype 300 Mink 48 Orthomyxoviridae Infections 228 Swine Diseases 153 Animals 1948 Spain 25 Swine 258 Viral Proteins 152 Virus Shedding 51

Evidence records

3 total
Experimental Infection
2 records · 2 evidence types
Evidence type
1 records
OVE8031
Key finding

Experimental infection of pigs with a mink-derived clade 2.3.4.4b H5N1 HPAIV from Spain caused interstitial pneumonia and necrotizing bronchiolitis with high viral titers in the lower respiratory tract.

Virus
Host
Location
Not specified
Supporting text

This study aimed to evaluate the pathogenicity and transmissibility of a mink-derived clade 2.3.4.4b H5N1 HPAIV isolate from Spain in pigs. Experimental infection caused interstitial pneumonia with necrotizing bronchiolitis with high titers of virus present in the lower respiratory tract and 100% seroconversion.

Method
experimental infection | pathological examination of lungs | viral titration or viral load analysis
Experimental system
experimental infection in pigs
Evidence type
1 records
OVE8035
Key finding

Pigs were experimentally infected and shown to be highly susceptible to the mink-derived clade 2.3.4.4b H5N1 highly pathogenic avian influenza virus.

Virus
Host
Location
Not specified
Supporting text

It is concluded that pigs are highly susceptible to infection with the mink-derived clade 2.3.4.4b H5N1 HPAIV.

Method
experimental infection | virus titration | serological analysis | pathology assessment
Sample type
lower respiratory tract
Experimental system
animal infection model (pig challenge experiment)
Functional Mechanism
1 records · 1 evidence types
Evidence type
1 records
OVE8034
Key finding

PB2-E627K and HA-Q222L mutations, associated with mammalian adaptation, emerged at low frequencies in pigs infected with the mink-derived clade 2.3.4.4b H5N1 HPAIV isolate from Spain.

Virus
Host
Not specified
Location
Not specified
Supporting text

Notably, critical mammalian-like adaptations such as PB2-E627 K and HA-Q222L emerged at low frequencies in principal-infected pigs. It is concluded that pigs are highly susceptible to infection with the mink-derived clade 2.3.4.4b H5N1 HPAIV and provide a favorable environment for HPAIV to acquire mammalian-like adaptations.

Genes or proteins
PB2 | HA
Mutations
PB2-E627K | HA-Q222L
Mechanism types
host-range expansion | receptor binding