China: How to prepare bird flu immunization program?

Author: Anonymous Published :2009-01-04 12:06:42 Source: Xinmin poultry Network

An authoritative source said: to prevent bird flu, the string is always tense, avian flu vaccine immunization are previously used by a number of live poisonous Miao Miao and restructuring are all disabled. The use of inactivated vaccine against the advantage of avoiding the impact of maternal antibodies. In principle, the 10-day-old must be used for the first time before and after the inactivated vaccine. Maternal antibody high time pushing, maternal antibody low, too early. In the 7-14 age range. The second immunization with the first 14-21 days interval. After the second immunization antibody levels will reach the level of immune protection. In the incubation period, the smaller the threat of avian flu, this time for the antibodies to monitor the work, you can not Miller. Opened for the protection of maternity and reduce stress laying period, the third immunization in the opening three weeks before the latest pre-opening week. Will then have to do a good job in monitoring the antibody level, usually 32-36 weeks, with an average HI lower than 26, we should strengthen the immune. If Miller, there are 3 seed, Re-1, Re-4, Re-5. On Re-5, I do not think that the current epidemic strains have absolute certainty, which some experts have a different point of view. Mutation of the problems caused by the vaccine can only be resolved through the existing high antibody levels to solve, the higher the proportion of cross-protection, the losses caused by the smaller, but in order to deal with the new variant strains, very likely. Re-1, Re-4, Re-5 antibody level can only decide the size of losses, especially Re-5 antibodies higher losses smaller decide whether you may still have a certain degree of loss, different chicken, feeding period of 100 days or more super-chicken, at least more than two immune. Broiler slaughter goods quickly, and can quarantine measures and bio-security, to conduct an appropriate level of risk, but it is around the prevalence of the principle, around the threat must be based on the early implementation of the immunization program.
All of the avian flu strain now, there are cross-cutting. Basically there are two lines, one is the old strain, type of Re-1, Class Re-5 of this line, the development of mutant; also Re-4 types, Re-5 type, rather than variable lead vary and types of Re-4 type of immune when to strike a balance between these two groups, the northern region dominated temporarily mutant. Then Re-4 supplementary immunization. This is a more appropriate approach.