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− | {{unfinished}} | + | {{unfinished}} |
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− | Caused by a herpesvirus | + | Caused by a herpesvirus |
| + | |
| + | ==== Hosts ==== |
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− | ====Hosts====
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| *The most important disease of '''unvaccinated backyard chicken flocks''' | | *The most important disease of '''unvaccinated backyard chicken flocks''' |
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− | ====Pathogenesis==== | + | ==== Pathogenesis ==== |
− | *Replicates initially in the lungs and B cells | + | |
− | *Enters feather follicles: produces virus-laden dander that is shed into litter | + | *Replicates initially in the lungs and B cells |
− | *Reaches T cells, causing proliferation without virus protein production | + | *Enters feather follicles: produces virus-laden dander that is shed into litter |
− | *T cells localize in brain or nerves causing '''encephalitis''' | + | *Reaches T cells, causing proliferation without virus protein production |
| + | *T cells localize in brain or nerves causing '''encephalitis''' |
| *End stage: massive visceral tumors | | *End stage: massive visceral tumors |
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− | ====Epidemiology==== | + | ==== Epidemiology ==== |
| + | |
| *More virulent strains evolving: presents a challenge to vaccinal immunity | | *More virulent strains evolving: presents a challenge to vaccinal immunity |
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− | ====Control==== | + | ==== Control ==== |
− | *Removal of litter between batches of chicks | + | |
| + | *Removal of litter between batches of chicks |
| *'''Vaccines''' administered in ovo at 18 days | | *'''Vaccines''' administered in ovo at 18 days |
− | [[Category:Herpesviridae]][[Category:Poultry]] | + | |
− | [[Category:To_Do_-_Clinical/Viruses]] | + | [[Category:Herpesviridae]] [[Category:Avian Viruses]] [[Category:To_Do_-_Clinical/Viruses]] |