H9N2-type influenza A viruses donate their internal genes to other influenza A virus subtypes. H9N2 is the most common subtype of influenza viruses in Chinese chickens and thus causes great economic loss for the poultry industry, even under the long-term vaccination programs.

H9N2 viruses are generally hyperendemic in affected countries and have been found in poultry in many new regions in recent years. In this review, we examine the current global spread of H9N2 avian influenza viruses as well as their host range, tropism, transmission routes and the risk posed by these viruses to human health.

2024年4月19日 · 2024年4月9日，越南的《国际卫生条例》国家归口单位向世界卫生组织（世卫组织）通报了一例人感染甲型H9N2流感病毒病例。 该患者有基础疾病，病情严重，于2024年3月21日被收入重症监护室。 3月21日采集了呼吸道样本，经实时聚合酶链反应检测呈流感阳性。 随后，在4月8日，病毒分型确认了甲型H9N2禽流感。 病例调查确定，该病例居住在一个家禽市场附近，其家门前每天都有家禽交易。 截至4月15日，没有关于在该病例的接触者中出现有呼吸道症 …

H9N2型禽流感是由正黏病毒科、流感病毒属A型流感病毒引起的一种急性、高度接触性传染病。 2024年6月11日，世界卫生组织（WHO）证实，印度出现一例人类感染H9N2禽流感病例。

2023年11月28日 · H9N2 influenza viruses are globally endemic in birds, and a sharp increase in human infections with H9N2 occurred during 2021 to 2022. In this study, we assess the antigenic and pathogenic impact of 23 hemagglutinin (HA) amino acid mutations.

Results from recent ferret research on the H9N2 subtype has demonstrated an increased theoretical threat to humans from the potential emergence of novel subtypes of avian influenza. In North America, there is no evidence of fixed lineages of the H9N2 avian influenza virus in land-based poultry; it is found in wild ducks and shore birds ( 5 ).

Continuously emergence of human infection with avian influenza A virus poses persistent threat to human health, as illustrated in H5N1, H7N9 and recent surge of H9N2 infections. Long-term prevalence of H9N2 avian influenza A virus in China and adjacent regions favours the interspecies transmissions …

H9N2 is a low-pathogenic avian influenza subtype that has a significant impact on the global poultry industry. Since 1994, H9N2 has continuously mutated as a zoonotic pathogen in China, thus posing a severe threat to the poultry industry as well as human life and health.

摘要：H9N2亚型禽流感病毒（AIVs）持续暴发和流行，不但给养禽业造成了重大损失，而且给公共卫生安全带来了潜在威胁。 为了解中国H9N2 AIVs的流行现状，作者对H9N2亚型AIVs的抗原性、受体结合特性、致病性进行了总结，并且对2016—2020年的流行毒株进行了分析。 结果显示，H9N2 AIVs在20多个省市地区流行，其中江西、广东、贵州、江苏等地区暴发次数较多。 H9N2 AIVs主要感染鸡，少数感染水禽和小家禽，零星感染人。 H9N2 AIVs主要位于h9.4.2.5分支， …

2022年11月10日 · The pandemic potential of H9N2 viruses is shown by the constant emergence of human-infecting influenza viruses with the internal genes of H9N2, 2 demonstrating that stopping the generation of novel human-infecting avian influenza viruses at their origin is urgently needed. We strongly advise that more attention be given to the prevention and ...