Public well being issues as extremely pathogenic avian influenza A(H5N1) virus present in cat in France


A examine revealed within the CDC journal Rising Infectious Illnesses describes the identification of a extremely pathogenic avian influenza A virus in a home cat that lived close to a duck farm contaminated by a carefully associated virus in France in December 2022.

Study: Highly Pathogenic Avian Influenza A(H5N1) Clade Virus in Domestic Cat, France, 2022. Image Credit: Ro_ksy/​​​​​​​Research: Extremely Pathogenic Avian Influenza A(H5N1) Clade Virus in Home Cat, France, 2022. Picture Credit score: Ro_ksy/


A case of extremely pathogenic avian influenza A (H5N1) clade virus an infection in a home cat was confirmed by the avian influenza Nationwide Reference Laboratory of the Company for Meals, Environmental and Occupational Well being & Security in France on December 27, 2022.

The cat lived subsequent to a duck farm, whereby an identical an infection was detected in additional than 8,000 geese in December 2022. The cat initially skilled a deterioration normally well being situation, together with apathy and gentle hyperthermia, adopted by extreme neurologic and respiratory signs.

The cat was subjected to compassionate euthanasia on December 24, 2022. Laboratory testing of respiratory and anal samples of the cat confirmed extremely pathogenic avian influenza A (H5N1) clade viral an infection.

Research observations

Scientists in contrast the whole viral sequence remoted from the cat with different carefully associated viral sequences circulating in France throughout the identical interval, together with these remoted from the duck farm.

Phylogenetic analyses indicated that the cat-isolated virus belonged to the duck-isolated virus-like genotype. This viral genotype has predominantly circulated in France and Europe since September 2022.

The cat-isolated virus differed from the duck-isolated virus by solely two mutations, together with an E627K mutation in polymerase primary protein two and E26G mutation in nonstructural protein 2.

The E627K mutation is chargeable for influenza virus adaptation to mammalian hosts. The E26G mutation, then again, may need a task in viral adaptation to temperature adjustments.

Amongst 90 publicly accessible sequences of extremely pathogenic avian influenza A (H5N1) clade viruses detected in mammals, 20 had the E627K mutation, indicating a fast number of this mutation in mammalian hosts.

A pointy rise in mammalian instances of extremely pathogenic avian influenza A (H5N1) clade infections has been noticed since winter 2021-22.

A better prevalence of extremely pathogenic avian influenza H5 virus infections in wild and home birds and an elevated interplay between contaminated birds and mammals could be chargeable for this rise.

One more reason might be elevated surveillance of avian influenza in wildlife, resulting in extra detection of an infection in mammals. As well as, the next capability of presently circulating viruses to contaminate mammalian hosts could be chargeable for the rise in mammalian instances.

In mammals, extremely pathogenic avian influenza A (H5N1) virus an infection is often related to medical presentation (neurologic signs) or loss of life.

Though inter-mammal transmission of this virus is a uncommon occasion, huge infections in seal colonies in america and a mink farm in Spain in 2022 have been reported. Within the present examine, nonetheless, no inter-mammal virus transmission was detected.

Research significance

The examine described a case of extremely pathogenic avian influenza A (H5N1) clade an infection in a home cat in December 2022. Sporadic infections by extremely pathogenic avian influenza A (H5N1) clades one and a pair of.2 have been detected in cats since 2004.

As talked about by scientists, shut interactions between home cats and people and fast number of mutations might give rise to a virus with the potential for inter-human viral transmission. This might be a possible public well being risk.

Given the examine findings, scientists suggest elevated surveillance of symptomatic home carnivores near contaminated birds. That is wanted to determine inter-mammal transmission occasions and stop human transmission quickly.

As well as, workers in hen farms must be supplied with acceptable protecting gear and barrier measures to keep away from direct viral transmission from contaminated birds.