[1] Agrifood & Biosci Inst, Bacteriol Branch, Vet Sci Div, Belfast, Antrim, North Ireland
[2] Univ Glasgow, Sch Engn, Glasgow G12 8LT, Lanark, Scotland
[3] NovaUCD, Auranta, Dublin, Ireland
[4] Banat Univ Anim Sci & Vet Med King Michael I Roma, Sch Bioengn Anim Sci Resources, Timisoara, Romania
[5] Univ Anim Sci & Vet Med, Sch Anim Sci & Biotechnol, Cluj Napoca, Romania
[6] Banat Univ Anim Sci & Vet Med King Michael 1 Roma, Fac Food Engn, Timisoara, Romania
[7] London Sch Hyg & Trop Med, Fac Infect & Trop Dis, 11 Keppel St, London WC1E 7HT, England
[8] Univ West England UWE Bristol, Bristol BS16 1QY, Avon, England