Abstract:
:Infectious laryngotracheitis virus (ILTV) is an alphaherpesvirus that causes acute respiratory disease in chickens worldwide. The virus is horizontally transmitted and causes large outbreaks of disease. Recent studies have shown that a glycoprotein G deficient candidate vaccine strain of ILTV (ΔgG ILTV) is safe and protects birds from disease following challenge with virulent virus. This study examined the transmission dynamics of this candidate vaccine and of ILTV in field and experimental settings. The reproduction ratio (R₀, average number of secondary infectious cases from a typical infectious case) was calculated from the growth rate of disease epidemics in broiler flocks. Assuming a latent period of 2 days and an infectious period of 4 days R₀ was estimated to be 2.43 (95% CI 2.25-2.69). In experimental settings the transmission characteristics of ΔgG ILTV were similar to those of wildtype virus, and importantly ΔgG ILTV remained safe following one in vivo passage and subsequent infection via contact-exposure. There was minimal transmission of wildtype virus in vaccinated birds. The findings from this study further demonstrate the suitability of ΔgG ILTV for use as a live attenuated vaccine. Knowledge of the basic reproduction ratio of ILTV will be valuable for future studies that aim to improve disease control using vaccination programs.
journal_name
Vaccinejournal_title
Vaccineauthors
Devlin JM,Hartley CA,Gilkerson JR,Coppo MJ,Vaz P,Noormohammadi AH,Wells B,Rubite A,Dhand NK,Browning GFdoi
10.1016/j.vaccine.2011.06.002subject
Has Abstractpub_date
2011-08-05 00:00:00pages
5699-704issue
34eissn
0264-410Xissn
1873-2518pii
S0264-410X(11)00866-8journal_volume
29pub_type
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