Development of vaccine-induced immunity against TRT in turkeys depends remarkably on the level of maternal antibodies and the age of birds on the day of vaccination

Table 4 Serum anti – aMPV IgY antibody level after aMPV vaccination ^a of turkeys

		Mean S/P-ratio ± S.D. ^b at days post aMPV/A vaccination
Experiment	Group	0	3	7	14
I	MDA+0/V (1:500)^c	2.19 ± 1.87	0.9 ± 0.51*	0.57 ± 0.5	0.23 ± 0.16
	MDA+0/NV (1:500)	2.19 ± 1.87	1.9 ± 1.36	0.6 ± 0.62	0.41 ± 0.36
III	MDA-0/V (1:100)	0.001 ± 0.00	0.006 ± 0.01	0.015 ± 0.017	0.179 ± 0.164**
	MDA-0/NV (1:100)	0.001 ± 0.00	0.005 ± 0.005	0.005 ± 0.008	0.00 ± 0.00
II	MDA+14/V (1:100)	0.598 ± 0.492	0.42 ± 0.361	0.21 ± 0.200	0.307 ± 0.217*
	MDA+14/NV (1:100)	0.598 ± 0.492	0.423 ± 0.345	0.228 ± 0.242	0.140 ± 0.116
IV	MDA-14/V (1:100)	0.00 ± 0.00	0.014 ± 0.038	0.034 ± 0.055*	0.123 ± 0.194*
	MDA-14/NV (1:100)	0.00 ± 0.00	0.00 ± 0.00	0.00 ± 0.00	0.00 ± 0.00

^aIn all experiments vaccinated birds were inoculated oculonassaly with 10⁴ TCID₅₀ of live attenuated aMPV/A vaccine.
^b15 samples of serum were analyzed per group.
^cSample dilution for ELISA procedure.
*/**Significant difference in mean (S/P)-ratio of vaccinated birds in comparison to the not vaccinated group (U-test, *as p < 0,05 and **as p < 0,01).

ISSN: 1746-6148