The Efficacy of Binary Ethylenimine-inactivated Vaccines of Gianyar-1/AK/2014 Virulent Strain in Protecting Chickens Against Tabanan-1/ARP/2017 Virulent Newcastle Disease Virus Isolates
Overview
Affiliations
Aim: This study aimed to prepare binary ethylenimine (BEI)-inactivated virulent Newcastle disease virus (NDV) vaccine and to examine their ability to induce a protective antibody response in commercial chickens.
Materials And Methods: A virulent NDV field isolate Gianyar-1/AK/2014 was propagated in chicken-embryonated eggs and was then inactivated with BEI at a concentration of 4 mM. Three groups of chickens with low-level (2 log hemagglutination inhibition [HI] units) maternally derived antibodies against NDV were then immunized with the BEI-inactivated vaccine. A commercial live vaccine (LaSota strain) was used as positive control, and phosphate-buffered saline (PBS) was used as negative control. A challenge experiment with a virulent NDV of Tabanan-1/ARP/2017 was performed at 3 weeks post-vaccination.
Results: At 2 weeks post-immunization, the mean titers of antibodies against NDV in serum samples of chickens immunized with 0.2 mL of BEI-inactivated NDV (Group I), with live commercial NDV vaccine (Group II) and with PBS (Group III) were 3±0.94 log HI units, 4.9±0.99 log HI unit, and 0.0±0.0 HI units, respectively. At week 3 post-immunization, the mean titers of the antibodies for the three groups were 5±1.09 log HI units, 6.9±0.32 log HI units, and 0.00 HI units, respectively. The antibody titer induced by inactivated NDV Gianyar-1/AK/2014 isolates examined at 2 and 3 weeks post-vaccination was still at a significantly (p<0.01) lower level as compared to those induced by commercial life vaccine. However, the challenge test with virulent NDV of Tabanan 1/ARP/2017 isolates showed that all immunized chickens (Group I and II) survived without exhibiting any clinical sign post-challenge with the protection rates of 100%, whereas all chickens injected with PBS (Group III) died with clinical signs of ND.
Conclusion: This finding shows that the BEI-inactivated vaccines prepared using virulent NDV of Gianyar-1/AK/2014 strain was able to induce protective antibody response in chickens but still at a lower level than those induce by commercial live NDV vaccine.
Ugwu C, Hair-Bejo M, Nurulfiza M, Omar A, Ideris A J Adv Vet Anim Res. 2024; 11(3):693-702.
PMID: 39605767 PMC: 11590594. DOI: 10.5455/javar.2024.k819.
Rahmanzad F, Amini Najafi F, Bahonar A, Parvandar Asadollahi K Arch Razi Inst. 2024; 79(2):437-444.
PMID: 39463717 PMC: 11512190. DOI: 10.32592/ARI.2024.79.2.437.
Comparing the Immunogenicity and Protective Effects of Three MERS-CoV Inactivation Methods in Mice.
Kim N, Lee T, Lee H, Yang J, Kim K, Lee J Vaccines (Basel). 2022; 10(11).
PMID: 36366352 PMC: 9693512. DOI: 10.3390/vaccines10111843.