Protection of chickens against H9N2 avian influenza virus challenge with recombinant Lactobacillus plantarum expressing conserved antigens.
Avian influenza virus (AIV) is spreading worldwide and is a serious threat to the health of poultry and humans. In many countries, low pathogenic AIVs, such as H9N2, have become an enormous economic burden on the commercial poultry industry because they cause mild respiratory disease and decrease egg production. A recombinant Lactobacillus plantarum NC8 strain expressing NP-M1-DCpep from H9N2 AIV has been studied in a mouse model. However, it remains unknown whether this L. plantarum strain can induce an immune response and provide protection against H9N2 AIV in chickens. In this study, chickens that were orally vaccinated with NC8-pSIP409-NP-M1-DCpep exhibited significantly increased T cell-mediated immune responses and mucosal sIgA and IgG levels, which provided protection against H9N2 AIV challenge. More importantly, compared with oral administration of NC8-pSIP409-NP-M1-DCpep, intranasal administration induced stronger immune responses and provided effective protection against challenge with the H9N2 virus by reducing body weight loss, lung virus titers, and throat pathology. Taken together, these findings suggest that L. plantarum expressing NP-M1-DCpep has potential as a vaccine to combat H9N2 AIV infection.
['Yang|Wen-Tao|WT|', 'Yang|Gui-Lian|GL|', 'Shi|Shao-Hua|SH|', 'Liu|Yu-Ying|YY|', 'Huang|Hai-Bin|HB|', 'Jiang|Yan-Long|YL|', 'Wang|Jian-Zhong|JZ|', 'Shi|Chun-Wei|CW|', 'Jing|Yu-Bei|YB|', 'Wang|Chun-Feng|CF|']
D000281:Administration, Intranasal D000284:Administration, Oral D000818:Animals D000914:Antibodies, Viral D000956:Antigens, Viral D002645:Chickens D018928:Immunity, Mucosal D007070:Immunoglobulin A D007074:Immunoglobulin G D053127:Influenza A Virus, H9N2 Subtype D007252:Influenza Vaccines D005585:Influenza in Birds D048191:Lactobacillus plantarum D008168:Lung D010614:Pharynx D011200:Poultry D013601:T-Lymphocytes
Chicken Conserved antigens L. plantarum Oral vaccines Mucosal vaccination