Reintroduction of highly pathogenic avian influenza A H7N9 virus in southwestern China.
Virus Genes
; 59(3): 479-483, 2023 Jun.
Article
in English
| MEDLINE | ID: covidwho-2241389
ABSTRACT
Highly pathogenic (HP) avian influenza A H7N9 virus has emerged in China since 2016. In recent years, it has been most prevalent in northern China. However, several strains of HP H7N9 reappeared in southwestern China (Yunnan Province) in 2021. As a result, we are wondering if these viruses have re-emerged in situ or been reintroduced. Here, we present phylogenetic evidence that the HP H7N9 viruses isolated in Yunnan emigrated from northern to southwestern China in 2020. The northern subregion of China has become a novel epicenter in HP H7N9 dissemination. Meanwhile, a cleavage motif re-emerged due to the T341I mutation, implying a parallel evolution. This cross-region transmission, which originated in non-adjacent provinces and traveled a great geographic distance in an unknown way, indicates that HP H7N9 dissemination did not halt in 2020, even under the shadow of the COVID-19 pandemic. Additional surveillance studies in poultry are required to determine the HP H7N9 virus's geographic distribution and spread.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Influenza, Human
/
Influenza A Virus, H7N9 Subtype
/
Influenza in Birds
/
COVID-19
Type of study:
Observational study
/
Randomized controlled trials
Limits:
Animals
/
Humans
Country/Region as subject:
Asia
Language:
English
Journal:
Virus Genes
Journal subject:
Molecular Biology
/
Virology
Year:
2023
Document Type:
Article
Affiliation country:
S11262-023-01974-4
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