Vaccination of influenza a virus decreases transmission rates in pigs

Table 1 Transmission parameter estimates and related 95% confidence intervals (CI) for each replicate and overall treatment groups

GROUP	Replicate	IP¹	β² (95%CI)	R³ (95%CI)	R⁴ (95%CI)
NV	1	4.7	1.99 (0.97-3.59)	9.35 (4-18.7)
NV	2	4.2	4.71 (2.20-9)	19.81 (8.3-41.4)	10.66 (6.57-16.46)^a
NV	3	4.6	1.85 (0.91-3.29)	8.51 (3.2-18.3)
HE	1	4	0.12 (0.01-0.56)	0.51 (0.02-2.26)
HE	2	5	0.36 (0.13-0.77)	1.8 (0.47-3.9)	0.99 (0.39-2.09)^b
HE	3	3.5	0.09 (0.01-0.4)	0.32 (0.01-3.27)
HE	4	2.4	0.53 (0.19-1.15)	1.27 (0.21-1.74)
HO	1	0	2.2310^-6 (na-0.52)	0
HO	2	0	2.2310^-6 (na-0.52)	0	0^c
HO	3	0	2.9410^-6 (na-0.52)	0

The number of initial infectious (Io) and susceptible (So) pigs in each replicate were Io = 1 and So = 10, except for HE 4 where the So = 9.
¹IP: average duration (days) of the infectious period for the contact pigs.
²β: transmission rate per day.
³Reproduction ratio R by replicate.
⁴Reproduction ratio R when replicates were combined by group.
^a,b,cStatistically significant differences (p < 0.05).

ISSN: 1297-9716