Memory immune responses and protection of chickens against a nephropathogenic          infectious bronchitis virus strain by combining live heterologous and inactivated          homologous vaccines

Santos, R. M.; Fernando, Filipe Santos; Montassier, Maria de Fátima Silva; Silva, Ketherson Rodrigues; Lopes, Priscila Diniz; Pavani, Caren; Borzi, Mariana Monezi; Okino, Cíntia Hiromi; Montassier, Hélio José

doi:10.1292/jvms.18-0065

Cited by 10 publications

(19 citation statements)

References 35 publications

(67 reference statements)

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“…It has been shown that the vaccination strategies that use live attenuated plus inactivated vaccines induce 90% or more protection when compared to the use of live attenuated vaccines alone [30][31][32]. Further, effective protection against nephropathogenic BR-I IBV was achieved by antibody-and cell-mediated immune response induced by the combination of a live attenuated vaccine of the Mass serotype and an inactivated vaccine that has the BR-I IBV strain [33]. It is not known if host responses, particularly mucosal immune responses generated by these different vaccination strategies, are different in laying hens.…”

Section: Introductionmentioning

confidence: 99%

Immune Responses in Laying Hens after an Infectious Bronchitis Vaccination of Pullets: A Comparison of Two Vaccination Strategies

et al. 2021

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For decades, vaccinations have been used to limit infectious bronchitis (IB) in both the broiler and layer industries. Depending on the geographical area, live attenuated vaccines are used either alone or in combination with inactivated vaccines to control infectious bronchitis virus (IBV) infections. It has been shown that administering inactivated vaccines preceded by priming with live attenuated vaccines in pullets protects laying hens against IB. However, the immunological basis of this protective response has not been adequately investigated. The objective of the study was to compare two vaccination strategies adapted by the Canadian poultry industry in terms of their ability to systemically induce an adequate immune response in IBV-impacted tissues in laying hens. The first vaccination strategy (only live attenuated IB vaccines) and second vaccination strategy (live attenuated and inactivated IB vaccines) were applied. Serum anti-IBV antibodies were measured at two time points, i.e., 3 weeks and 10 weeks post last vaccination. The recruitment of T cell subsets (i.e., CD4+ and CD8+ T cells), and the interferon (IFN)-γ mRNA expression were measured at 10 weeks post last vaccination. We observed that vaccination strategy 2 induced significantly higher serum anti-IBV antibody responses that were capable of neutralizing an IBV Mass variant associated with a flock history of shell-less egg production better than a Delmarva (DMV)1639 variant, as well as a significantly higher IFN-γ mRNA expression in the lungs, kidneys, and oviduct. We also observed that both vaccination strategies recruited CD4+ T cells as well as CD8+ T cells to the examined tissues at various extents. Our findings indicate that vaccination strategy 2 induces better systemic and local host responses in laying hens.

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Section: Introductionmentioning

confidence: 99%

Immune Responses in Laying Hens after an Infectious Bronchitis Vaccination of Pullets: A Comparison of Two Vaccination Strategies

et al. 2021

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“…Although a large number of live and inactivated IBV vaccines based on different genotype strains are widely used worldwide, IB outbreaks continue to occur sporadically due to high mutation rate and poor cross-protective effects of the different IBV strains (Cook et al 2001;Liu et al 2009b;Xue et al 2012;dos Santos et al 2019).…”

Section: Discussionmentioning

confidence: 99%

The Efficacy of a Live Attenuated TW I-Type Infectious Bronchitis Virus Vaccine Candidate

Zhang

Chen

et al. 2021

Virol. Sin.

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Infectious bronchitis (IB) is a highly contagious avian disease caused by infection with infectious bronchitis virus (IBV), which seriously affects the development of the global poultry industry. The distribution of TW I-type IBV in China has increased in recent years, becoming a widespread genotype. We previously isolated a TW I-type IBV strain termed CK/ CH/GD/GZ14 in 2014, but its pathogenicity and possibility for vaccine development were not explored. Therefore, this research aimed to develop a live-attenuated virus vaccine based on the CK/CH/GD/GZ14 strain. The wild type IBV CK/ CH/GD/GZ14 strain was serially passaged in SPF embryos for 145 generations. The morbidity and mortality rate of wildtype strain in 14 day-old chickens is 100% and 80% respectively, while the morbidity rate in the attenuated strain was 20% in the 95th and 105th generations and there was no death. Histopathological observations showed that the pathogenicity of the 95th and 105th generations in chickens was significantly weakened. Further challenge experiments confirmed that the attenuated CK/CH/GD/GZ14 strain in the 95th and 105th generations could resist CK/CH/GD/GZ14 (5th generation) infection and the protection rate was 80%. Tracheal cilia stagnation, virus shedding, and viral load experiments confirmed that the 95th and 105th generations provide good immune protection in chickens, and the immunogenicity of the 105th generation is better than that of the 95th generation. These data suggest that the attenuated CK/CH/GD/GZ14 strain in the 105th generation may be applied as a vaccine candidate against TW I-type IBV.

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“…More so, IBV-CS vaccine an inactivated IBV vaccine encapsulated in chitosan nanoparticles induced production of IFN-γ, IgA and IgY against IBV [88] and this is unlike the conventional inactivated vaccine, which only elicits limited mucosal immune responses. A combination of live attenuated vaccine and inactivated vaccine containing a BR-I IBV strain confer effective immune protection against infectious IBV strain through the induction of IgY anti-IBV antibodies and effector TCD8 cells and granzyme A [89]. It is believed that the induced anti-IBV IgY was as a result of the development of memory B lymphocytes after administration of live attenuated vaccine a day before re-vaccination with the oil adjuvanted inactivated vaccine, which upregulated IgY gene expression [89].…”

Section: Vaccine-mediated Immunity Against Ib and Nd 231 Vaccine-mmentioning

confidence: 99%

“…A combination of live attenuated vaccine and inactivated vaccine containing a BR-I IBV strain confer effective immune protection against infectious IBV strain through the induction of IgY anti-IBV antibodies and effector TCD8 cells and granzyme A [89]. It is believed that the induced anti-IBV IgY was as a result of the development of memory B lymphocytes after administration of live attenuated vaccine a day before re-vaccination with the oil adjuvanted inactivated vaccine, which upregulated IgY gene expression [89]. Full dose vaccination with H120 a live attenuated vaccine on a day-old chick showed full protection against IBV marked with high levels of IBV-specific IgY, IgA and cell-mediated immune genes including, IFN-γ, CD8+ T cells, and granzyme homolog A [82].…”

Section: Vaccine-mediated Immunity Against Ib and Nd 231 Vaccine-mmentioning

confidence: 99%

Towards Improved Use of Vaccination in the Control of Infectious Bronchitis and Newcastle Disease in Poultry: Understanding the Immunological Mechanisms

et al. 2021

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Infectious bronchitis (IB) and Newcastle disease (ND) are two important diseases of poultry and have remained a threat to the development of the poultry industry in many parts of the world. The immunology of avian has been well studied and numerous vaccines have been developed against the two viruses. Most of these vaccines are either inactivated vaccines or live attenuated vaccines. Inactivated vaccines induce weak cellular immune responses and require priming with live or other types of vaccines. Advanced technology has been used to produce several types of vaccines that can initiate prime immune responses. However, as a result of rapid genetic variations, the control of these two viral infections through vaccination has remained a challenge. Using various strategies such as combination of live attenuated and inactivated vaccines, development of IB/ND vaccines, use of DNA vaccines and transgenic plant vaccines, the problem is being surmounted. It is hoped that with increasing understanding of the immunological mechanisms in birds that are used in fighting these viruses, a more successful control of the diseases will be achieved. This will go a long way in contributing to global food security and the economic development of many developing countries, given the role of poultry in the attainment of these goals.

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Memory immune responses and protection of chickens against a nephropathogenic infectious bronchitis virus strain by combining live heterologous and inactivated homologous vaccines

Cited by 10 publications

References 35 publications

Immune Responses in Laying Hens after an Infectious Bronchitis Vaccination of Pullets: A Comparison of Two Vaccination Strategies

Immune Responses in Laying Hens after an Infectious Bronchitis Vaccination of Pullets: A Comparison of Two Vaccination Strategies

The Efficacy of a Live Attenuated TW I-Type Infectious Bronchitis Virus Vaccine Candidate

Towards Improved Use of Vaccination in the Control of Infectious Bronchitis and Newcastle Disease in Poultry: Understanding the Immunological Mechanisms

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