Abstract
Cross protection conferred by a live Pasteurella multocida B:3,4 vaccine to infection by P. multocida B:2, the haemorrhagis septicaemia causing bacteria in cattle was investigated. Intranasal aerogenic immunization and subcutaneous injection of the live vaccine were applied to groups I and II of 5 Bali cattle respectively. Another group (III) of 5 cattle were vaccinated with standard oli adjuvant killed vaccine intramuscularly. Cattle were observed for clinical signs and body temperatures were measured. Sera were collected monthly for 12 month and kept at -20 0 C for further testing by ELISA. No adverse sign was observed at cattle of groups I and II after vaccination with the live vaccine. Both intranasal and subcutaneous vaccination of live vaccine showed a similar serological response which started at month-5, peaked at month-(6-7) after vaccination and still sustained at the level above positive cut-off (88 ELISA Unit) at the end of observation month-12. Cattle vaccinated with killed adjuvanted vaccine responded earlier, peaked at 5-6 month after vaccination and declined steadily till the end of investigation. At 6 and 12 months after vaccination catlle were challenged with P. multocida B:2. All vaccinated cattle challenged at 6 months (C-1) and 12 (C-2) months after vaccination survived and showed no clinical signs. Body temperatures of all vaccinated cattle were normal and ranged from 38.1 0 C to 39.1 0 C and 38.5 0 C to 39.5 0 C for cattle chalenged at C-1 and C-2 respectively. However, there was 1 cattle of group I at C-1 showed an initial increase of body temperature to 40 0 C and decreased to normal at 42 hours after challenge. One catlle of group II had a body temperature of 40.7 0 C detected at 5 hours post C-2 and reached a normal temperature at hour-11. Both unvaccinated cattle at C-1 and C-2 died and had body temperatures of 41.4 0 C and 41.1 0 C respectively at the time of death. This investigation shows that live vaccine P. multocida B:3,4 is safe and can protect cattle from haemorrhagic septicaemia for at least 12 months. This vaccine is promising to be used to replace oil adjuvanted killed bacterin for haemorrhagic secticaemia. Key words : Live aerosol vaccine, protection, haemorrhagic septicaemia, cattle
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
