tetano
Editor, Senior Moderator
Emerg Microbes Infect
. 2021 Oct 19;1-36.
doi: 10.1080/22221751.2021.1996209. Online ahead of print.
Limited onward transmission potential of reassortment genotypes from chickens co-infected with H9N2 and H7N9 avian influenza viruses
Wen Su[SUP] 1 [/SUP], Sin Fun Sia[SUP] 1 [/SUP], Ka-Tim Choy[SUP] 1 [/SUP], Yue Ji[SUP] 1 [/SUP], Dongdong Chen[SUP] 1 [/SUP], Eric Ho Yin Lau[SUP] 1 [/SUP], Guanghua Fu[SUP] 2 [/SUP], Yu Huang[SUP] 2 [/SUP], Jinhua Liu[SUP] 3 [/SUP], Malik Peiris[SUP] 1 [/SUP], Juan Pu[SUP] 3 [/SUP], Hui-Ling Yen[SUP] 1 [/SUP]
Affiliations
Abstract
The segmented genome of influenza A virus has conferred significant evolutionary advantages to this virus through genetic reassortment, a mechanism that facilitates the rapid expansion of viral genetic diversity upon influenza co-infections. Therefore, co-infection of genetically diverse avian influenza viruses in poultry may pose a significant public health risk in generating novel reassortants with increased zoonotic potential. This study investigated the reassortment patterns of a Pearl River Delta-lineage avian influenza A(H7N9) virus and four genetically divergent avian influenza A(H9N2) viruses upon co-infection in embryonated chicken eggs and chickens. To characterize "within-host" and "between-host" genetic diversity, we further monitored the viral genotypes that were subsequently transmitted to contact chickens in serial transmission experiments. We observed that co-infection with A(H7N9) and A(H9N2) viruses may lead to the emergence of novel reassortant viruses in ovo and in chickens, albeit with different reassortment patterns. Novel reassortants detected in donor chickens co-infected with different combinations of the same A(H7N9) virus and different A(H9N2) viruses showed distinct onward transmission potential to contact chickens. Sequential transmission of novel reassortant viruses was only observed in one out of four co-infection combinations. Our results demonstrated different patterns by which influenza viruses may acquire genetic diversity through co-infection in ovo, in vivo, and under sequential transmission conditions.
Keywords: H9N2; co-infection; poultry; reassortment; transmission chain.
. 2021 Oct 19;1-36.
doi: 10.1080/22221751.2021.1996209. Online ahead of print.
Limited onward transmission potential of reassortment genotypes from chickens co-infected with H9N2 and H7N9 avian influenza viruses
Wen Su[SUP] 1 [/SUP], Sin Fun Sia[SUP] 1 [/SUP], Ka-Tim Choy[SUP] 1 [/SUP], Yue Ji[SUP] 1 [/SUP], Dongdong Chen[SUP] 1 [/SUP], Eric Ho Yin Lau[SUP] 1 [/SUP], Guanghua Fu[SUP] 2 [/SUP], Yu Huang[SUP] 2 [/SUP], Jinhua Liu[SUP] 3 [/SUP], Malik Peiris[SUP] 1 [/SUP], Juan Pu[SUP] 3 [/SUP], Hui-Ling Yen[SUP] 1 [/SUP]
Affiliations
- PMID: 34666614
- DOI: 10.1080/22221751.2021.1996209
Abstract
The segmented genome of influenza A virus has conferred significant evolutionary advantages to this virus through genetic reassortment, a mechanism that facilitates the rapid expansion of viral genetic diversity upon influenza co-infections. Therefore, co-infection of genetically diverse avian influenza viruses in poultry may pose a significant public health risk in generating novel reassortants with increased zoonotic potential. This study investigated the reassortment patterns of a Pearl River Delta-lineage avian influenza A(H7N9) virus and four genetically divergent avian influenza A(H9N2) viruses upon co-infection in embryonated chicken eggs and chickens. To characterize "within-host" and "between-host" genetic diversity, we further monitored the viral genotypes that were subsequently transmitted to contact chickens in serial transmission experiments. We observed that co-infection with A(H7N9) and A(H9N2) viruses may lead to the emergence of novel reassortant viruses in ovo and in chickens, albeit with different reassortment patterns. Novel reassortants detected in donor chickens co-infected with different combinations of the same A(H7N9) virus and different A(H9N2) viruses showed distinct onward transmission potential to contact chickens. Sequential transmission of novel reassortant viruses was only observed in one out of four co-infection combinations. Our results demonstrated different patterns by which influenza viruses may acquire genetic diversity through co-infection in ovo, in vivo, and under sequential transmission conditions.
Keywords: H9N2; co-infection; poultry; reassortment; transmission chain.