Delayed-type hypersensitivity test for assessing tick-immune status of cattle in Zambia.
Delayed-type hypersensitivity skin reactions were used to assess the tick resistance status of Tonga calves in Zambia. The antigen used in the tests was a homogenate of unfed nymphal Rhipicephalus appendiculatus which had been shown to give protective immunity in guinea pigs to adult female R appendiculatus. There was a significant negative correlation between the intensity of the reactions and the total number of ticks (Amblyomma variegatum, R appendiculatus, Hyalomma truncatum, Boophilus decoloratus and Rhipicephalus species) on the animals.
Royal Veterinary College, London.
R E
RE
Smith
E T
ET
Mwase
A
A
Heller-Haupt
P K
PK
Trinder
R G
RG
Pegram
A J
AJ
Wilsmore
M G
MG
Varma
D000818:Animals; D000941:Antigens / Q000276:immunology; D002417:Cattle / Q000276:immunology; D002418:Cattle Diseases / Q000276:immunology*; D006968:Hypersensitivity, Delayed / Q000276:immunology / Q000662:veterinary*; D007110:Immunity, Active; D013984:Tick Infestations / Q000276:immunology / Q000662:veterinary*; D013987:Ticks / Q000276:immunology; D015024:Zambia
D000941:Antigens