A vaccine against Newcastle disease?
Newcastle disease has yet again struck down poultry in West Africa, in particular Senegal and Côte d Ivoire. Breeders who have vaccinated their flocks are very concerned with the high mortality rate being caused by this highly contagious disease, and doubt is being cast on the efficacy of existing vaccines. Researchers at the national laboratory for veterinary research of the Senegalese institute of agricultural research (ISRA-LNRV) in Dakar are studying various vaccines in modern breeding facilities, in cooperation with the team of poultry technicians. Their studies have shown that live vaccines administered through drinking troughs are less efficient than injected vaccines, because they do not keep well at the ambient temperature. Poor water quality and disinfectants in the water both alter the vaccines properties, as do dirty troughs, some of which are made of metal, where metallic ions render the vaccines inactive. Using inactive vaccines in oil, on the other hand, seems to give very good results. The best protection is achieved when the live vaccine is administered through the mouth, and the inactive vaccine is injected one day after birth with two repeats, one at eight weeks and one at 18 weeks. The researchers warned that these procedures may not work in other countries, where the epidemiological situation could differ. Furthermore, attention still needs to be paid to complementary hygiene measures: raising chicks of the same age, a thorough clean-out after a cycle of chicks and regular disinfection of the chicken houses. From Revue d élevage et de médecine vétérinaire Vol.LII, 3-4, 1999 E. Cardinale ISRA-LNRV BP 2057, Dakar, Senegal Fax: +221 821 18 79
| Main Author: | |
|---|---|
| Format: | News Item biblioteca |
| Language: | English |
| Published: |
Technical Centre for Agricultural and Rural Cooperation
2000
|
| Online Access: | https://hdl.handle.net/10568/46984 https://hdl.handle.net/10568/99592 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|