Anaemia‐dermatitis of broilers: Field observations on its occurrence, transmission and prevention

A survey of specific pathogen‐free chicken flocks for antibodies to chicken anaemia agent, avian nephritis virus and group a rotavirus

“…CAA causes a syndrome characterised by aplastic anaemia, lymphoid depletion and increased mortality in experimentally inoculated susceptible chicks (Yuasa et al, 1979). CAA infection in the field has been associated with a similar syndrome in young broiler and layer chickens in Japan (Yuasa etal, 1983;Goryo et al, 1985Goryo et al, , 1987b and with outbreaks of a syndrome characterised by panmyelopathy, anaemia, haemorrhagic diathesis and dermatitis which has been described in young chickens, particularly broilers, in a number of countries (Bùlow et al, 1986;Engström, 1988;Vielitz and Landgraf, 1988). The significance of ANV as an avian pathogen in the field has not yet been defined, but it causes kidney lesions and impairment of growth in experimentally inoculated chicks .…”

Chicken infectious anaemia vaccinal strain persists in the spleen and thymus of young chicks and induces thymic lymphoid cell disorders

“…The disease is transmitted vertically and horizontally (Chettle et al, 1989;Hoop, 1992). It is characterized by aplastic anaemia, heterophil decrease, generalized lymphoid atrophy, skin lesions, haemorrhages, immunosuppression, enhancement of the pathogenicity of secondary infectious agents, suboptimal antibody responses and mortality in chicks younger than 3 weeks old (Taniguchi et al, 1982;Goryo et al, 1985;McNulty et al, 1988;Vielitz & Landgraf, 1988;Jeurissen et al, 1992;Otaki et al, 1992). In younger chicks, extensive lesions occurred in thymus and bone marrow between 10 and 17 days post infection (p.i.)…”

A micro‐scale serum neutralisation test for the detection and titration of antibodies to chicken anaemia agent ‐ prevalence of antibodies in Danish chickens

“…It has also been associated with haemorrhagic syndrome and gangrenous dermatitis (Yuasa et al, 1987;Engström et al, 1988;Vielitz and Landgraf, 1988). CAA can be transmitted either vertically (Yuasa and Yoshida, 1983) or horizontally (Yuasa et al, 1980b), the former probably predominating in the field (Vielitz and Landgraf, 1988). Yuasa et al (1980a) demonstrated that maternal antibodies are protective to their progeny.…”

“…Evidently the CAA infection causes anaemia and severe immunodepression (Yuasa et al, 1979;Taniguchiefa/., 1982Taniguchiefa/., ,1983Goryoetal, 1985;Bülowera/., 1986a, b;Goryo et al, 1987;Box et al, 1988;Otaki et al, 1988;Goryo et al, 1989). It has also been associated with haemorrhagic syndrome and gangrenous dermatitis (Yuasa et al, 1987;Engström et al, 1988;Vielitz and Landgraf, 1988). CAA can be transmitted either vertically (Yuasa and Yoshida, 1983) or horizontally (Yuasa et al, 1980b), the former probably predominating in the field (Vielitz and Landgraf, 1988).…”