Abstract
Virulent isolate of peste des petits ruminants virus (PPRV) of Indian origin (PPRV Jhansi 2003) initially adapted in Vero cells was further propagated in thermo-adapted (Ta) Vero cells grown at 40 °C for attaining thermo-adaption and attenuation of virus for development of Ta vaccine against PPR in goats and sheep. The virus was attenuated up to 50 passages in Ta Vero cells, at which, the virus was found sterile, innocuous in mice and guinea pigs and safe in seronegative goats and sheep. The developed vaccine was tested for its immunogenicity in goats and sheep by subcutaneous inoculation of 100 TCID50 (0.1 field dose), 103 TCID50 (one field dose) and 105 TCID50 (100 field doses) of the attenuated virus along with controls as per OIE described protocols for PPR vaccine testing and were assessed for PPRV-specific antibodies 7–28 days post vaccination (dpv) by PPR competitive ELISA and serum neutralization tests. The PPRV antibodies were detected in all immunized goats and sheep and goats were protective when challenged with virulent PPRV at 28th dpv along with controls for potency testing of the vaccine. The attenuated vaccine did not induce any adverse reaction at high dose (105 TCID50) in goats and sheep and provided complete protection even at low dose (102 TCID50) in goats when challenged with virulent virus. There was no shedding and horizontal transmission of the attenuated virus to in-contact controls. The results indicate that the developed PPR Ta attenuated virus is innocuous, safe, immunogenic and potent or efficacious vaccine candidate alternative to the existing vaccines for the protection of goats and sheep against PPR in the tropical countries like India.
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Acknowledgments
The authors thank the Director, Indian Veterinary Research Institute for providing necessary facilities to carry out this work and the staff of Rinderpest and Allied Disease Laboratory and Animal Sheds, Division of Virology, Mukteswar, for their valuable assistance and timely help in carrying out this work. The study in the form of Ad-hoc Scheme (F.No.11-3/2007-GA-II and 1-1/2007-ASR-IV) was funded by Indian Council of Agricultural Research, Government of India, New Delhi, India.
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Balamurugan, V., Sen, A., Venkatesan, G. et al. Protective immune response of live attenuated thermo-adapted peste des petits ruminants vaccine in goats. VirusDis. 25, 350–357 (2014). https://doi.org/10.1007/s13337-014-0208-x
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DOI: https://doi.org/10.1007/s13337-014-0208-x