Influenza A virus subtype H7N2

Virus classification
(unranked):  | Virus
Realm:  | Riboviria
Kingdom:  | Orthornavirae
Phylum:  | Negarnaviricota
Class:  | Insthoviricetes
Order:  | Articulavirales
Family:  | Orthomyxoviridae
Genus:  | Alphainfluenzavirus
Species:  |

Influenza A virus

Serotype:  |

Influenza A virus subtype H7N2

Influenza (Flu)

Types

* Avian
* A/H5N1 subtype
* Canine
* Equine
* Swine
* A/H1N1 subtype

Vaccines

* 2009 pandemic
* Pandemrix
* Live attenuated
* Seasonal flu vaccine brands

Treatment

* Amantadine
* Laninamivir
* Oseltamivir
* Peramivir
* Rimantadine
* Umifenovir
* Vitamin D
* Zanamivir

Pandemics

* 1918 Spanish flu
* 1957 Asian flu
* 1968–1969 Hong Kong flu
* 2009 swine flu

Outbreaks

* 1976 swine flu
* 2006 H5N1 India
* 2007 Australian equine
* 2007 Bernard Matthews H5N1
* 2008 West Bengal
* 2015 United States H5N2 outbreak

See also

* Flu season
* Influenza evolution
* Influenza research
* Influenza-like illness
* Vaccine reformulations

* v
* t
* e

Influenza A virus subtype H7N2 (A/H7N2) is a subtype of the species Influenza A virus. This subtype is one of several sometimes called bird flu virus. H7N2 is considered a low pathogenicity avian influenza (LPAI) virus. [1] With this in mind, H5 & H7 influenza viruses can re-assort into the Highly Pathogenic variant if conditions are favorable.

## Contents

* 1 History
* 2 References
* 3 Further reading
* 4 External links

## History[edit | edit source]

Clinical manifestations is shown across different host and their sialic acid properties[2]

A CDC study following outbreaks of H7N2 in commercial poultry farms in western Virginia in 2002 concluded:

An important factor contributing to rapid early spread of AI virus infection among commercial poultry farms during this outbreak was disposal of dead birds via rendering off-farm. Because of the highly infectious nature of AI virus and the devastating economic impact of outbreaks, poultry farmers should consider carcass disposal techniques that do not require off-farm movement, such as burial, composting, or incineration.[3]

One person in Virginia, United States in 2002, one person in New York, United States, in 2003, and one person in New York, United States, in 2016[4] were found to have serologic evidence of infection from H7N2; all fully recovered.

An analysis of the New York 2003 case concluded that the H7N2 virus responsible could be evolving toward the same strong sugar-binding properties of the three worldwide viral pandemics in 1918, 1957 and 1968. (Human flus and bird flus differ in the molecules they are good at binding with because mammals and birds differ in the molecules on the cell surface to be bound with. Humans have very few cells with the bird sugar on its cell surface.) A study with ferrets showed that this H7N2 strain could be passed from mammal to mammal.[5][6]

In February 2004, an outbreak of low pathogenic avian influenza (LPAI) A (H7N2) was reported on 2 chicken farms in Delaware and in four live bird markets in New Jersey supplied by the same farms. In March 2004, surveillance samples from a flock of chickens in Maryland tested positive for LPAI H7N2. It is likely that this was the same strain.[7]

On 24 May 2007, an outbreak of H7N2 was confirmed at a poultry farm near Corwen, in Wales from tests on chickens that died from H7N2. The owners of the Conwy farm bought 15 Rhode Island Red chickens two weeks prior but all died from H7N2. The 32 other poultry at the site were slaughtered. A one kilometer exclusion zone was put in force around the property in which birds and bird products cannot be moved and bird gathering can only take place under licence. Nine people who were associated with the infected or dead poultry and reported flu-like symptoms were tested. Four tested positive for evidence of infection from H7N2 and were successfully treated for mild flu.[8] In early June it was discovered that the virus had spread to a poultry farm 70 miles (113 km) away near St. Helens in north-west England. All the poultry at the farm were slaughtered and a 1 km exclusion zone imposed.[9]

In December 2016, an outbreak of low pathogenic avian influenza H7N2 occurred in a feline population in the New York City Animal Care Center (ACC) shelters after testing by the University of Wisconsin-Madison School of Veterinary Medicine and confirmed by USDA's National Veterinary Diagnostic Services Laboratory.[10] Over 100 cats were found to be infected and subsequently quarantined, but only one human, a veterinarian involved in obtaining respiratory specimens, was found to be infected. The veterinarian had a brief illness with mild symptoms and recovered completely. All other humans exposed to the infected cats tested negative.[4]

## References[edit | edit source]

1. ↑ "CDC: Influenza Type A Viruses". Archived from the original on 2021-06-01. Retrieved 2023-01-22.
2. ↑ Horman, William S. J.; Nguyen, Thi H. O.; Kedzierska, Katherine; Bean, Andrew G. D.; Layton, Daniel S. (2018). "The Drivers of Pathology in Zoonotic Avian Influenza: The Interplay Between Host and Pathogen". Frontiers in Immunology. 9. doi:10.3389/fimmu.2018.01812/full. ISSN 1664-3224. Retrieved 29 February 2024.
3. ↑ "flu research". Archived from the original on 2012-07-16. Retrieved 2006-01-27.
4. ↑ 4.0 4.1 "NYC DOHMH 2016 Health Alert #52: Update on Avian Influenza A H7N2 Infection in Cats in NYC Shelters" (PDF). Archived from the original (PDF) on 2016-12-23. Retrieved 2016-12-22.
5. ↑ timesonline Archived 2009-05-08 at the Wayback Machine article Scientists identify second H7 strain of bird flu that could cause pandemic published May 27, 2008
6. ↑ "Evolution of flu strains points to higher risk of pandemic: study". Archived from the original on 2008-06-04. Retrieved 2008-05-26.
7. ↑ "CDC: Information on Avian Influenza". Archived from the original on 2015-03-16. Retrieved 2023-01-22.
8. ↑ BBC Archived 2007-09-17 at the Wayback Machine article "Bird flu case confirmed at farm" May 24, 2007
9. ↑ Scotsman News Archived 2020-04-05 at the Wayback Machine article Mild bird flu virus spreads to north-west England June 8, 2007
10. ↑ "NYC DOHMH 2016 Veterinary Advisory # 1: Influenza A, H7N2 Identified in Cats from Animal Care Centers of New York City Facility in Manhattan" (PDF). Archived (PDF) from the original on 2017-06-13. Retrieved 2023-01-22.

## Further reading[edit | edit source]

* Research Update on H7n2 Avian Influenza Virus in Turkeys and Chickens Archived 2016-03-03 at the Wayback Machine
* Epidemiology of an H7N2 Avian Influenza Outbreak in Broilers in Pennsylvania in November 2001– January 2002
* Avian influenza H7N2 in Wales and the Northwest of England Archived 2012-07-29 at the Wayback Machine
* North Wales bird flu outbreak ends Archived 2008-06-24 at the Wayback Machine

## External links[edit | edit source]

* Influenza Research Database Database of influenza sequences and related information.
* CDC avian flu information Archived 2015-10-09 at the Wayback Machine

* v
* t
* e

Influenza

General topics|

* Research
* Vaccine
* Treatment
* Genome sequencing
* Reassortment
* Superinfection
* Flu season

Viruses|

* Orthomyxoviridae
* Influenza A
* Influenza B
* Influenza C
* Influenza D

Influenza A virus
subtypes

* H1N1
* H1N2
* H2N2
* H2N3
* H3N1
* H3N2
* H3N8
* H5N1
* H5N2
* H5N3
* H5N6
* H5N8
* H5N9
* H6N1
* H7N1
* H7N2
* H7N3
* H7N4
* H7N7
* H7N9
* H9N2
* H10N7
* H10N8
* H11N2
* H11N9

H1N1|

| Pandemics|

* 1918 (Spanish flu)
* 2009 (Swine flu)

|

Science|

* 2009 A/H1N1

H5N1|

| Outbreaks|

* Croatia (2005)
* India (2006)
* UK (2007)
* West Bengal (2008)

|

Science|

* Genetic structure
* Transmission and infection
* Global spread
* Vaccine
* clinical trials
* Human mortality
* Social impact
* Pandemic preparation

Treatments|

| Antiviral drugs|

* Adamantane derivatives
* Amantadine
* Rimantadine
* Neuraminidase inhibitor
* Oseltamivir
* Laninamivir
* Peramivir
* Zanamivir
* Peramivir (experimental)
* Umifenovir
* Baloxavir marboxil

|

Vaccines|

* Live attenuated influenza vaccine
* Brands
* Pandemrix
* Audenz

Pandemics and
epidemics

| Pandemics|

* Influenza pandemic (1510)
* Influenza pandemic (1557)
* "Russian flu" (1889-1890)
* "Spanish flu" (1918)
* "Asian flu" (1957)
* "Hong Kong flu" (1968)
* "Swine flu" (2009)

|

Epidemics|

* "Russian flu" (1977-1978)
* "Fujian flu" (H3N2)
* 1989–90 UK outbreak
* Central Luzon H5N6 (2017)

Non-human|

| Mammals|

* Canine
* Feline
* Equine
* 2007 Australian outbreak
* Swine

|

Non-mammals|

* Avian
* Fujian (H5N1)

Complications|

* Acute bronchitis
* Bronchiolitis
* Croup
* Otitis media
* Pharyngitis
* Pneumonia
* Sinusitis
* Strep throat

Related topics|

* Influenza-like illness
* 2017–2018 United States flu season
* US influenza statistics by flu season

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