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Abstract
VI-Summary
This work was crried out to survey the Salmonella infection in table egg layer
farms including birds in laying and rearing ages together with other surroundings
including, rodents, feed and feed ingredient, followed by evaluation of the behaviour
of live salmonella vaccine in turkeys field trial and in male layer type chIcks.
Evaluation of efficacy of live and killed salmonella vaccine was made in an
experimental infection against shedding and colonization in the internal organs with
with rthe cdhalienge strain (SF26), together with monitoring of the antibody titer
before and after challenge.
The results were summarized as following:
1-Out of 22 examined table egg layer flocks with a total of 11 samples of feed and
feed ingredients with a total of 23 rodents of various types, a total of 9 suspected
salmonella isolates were recovered. The suspected 9 salmonella isolates were: two
isolates from laying flocks(SE and S.typhimurium), two isolates from rearing
flocks(SE), one isolate from concentrate(SE) and four isolates from rodents(SE,
S .typhimurium&Untypable salmonella isolate).
2-Shedding of live vaccine in turkey field trial began from theist day post
th I
vaccination and disappeared cor.ipletely at 10 day accompined by moderate means
of titer in the second ond third week post vaccination.
3- Shedding of live vaccine in male layer type chicks continued till the 10th1 day post
vaccination with lower mean titer than turkey glocks.
4-Shedding of the challeng organism (SE26) was higher to all groups in the 1st week
post I.M chaalenge, which decreased markedly in the next week post I.M challenge
and in the two wekks post oral challenge which may be due to the route of infection
or the time factor from vaccination and challenge as protection was easly seen in the
vaccinated with some perority to local bacterin group, one week post 1.M challenge
which was equal to 3 weeks post vaccination.