![Sample our Environment & Agriculture journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5934/TOC-Subject-Sample-2021-Environment-Agriculture.jpg"})
Abstract
Extract
The recognition that animals develop immunity to a wide range of protozoan and helminth parasites first began about 80 yearsago with the observations of Smith and Kilbourne (Citation1893) that cattle recovered from Texas fever (Babesia bigemina) were immune to subsequent infection. This was followed by reports of acquired immunity in various helminth infections including trichinosis (Ducas, Citation1921), strongyloidosis (Sanground, Citation1928), haemonchosis (Stoll, Citation1928; Citation1929) and nippostrongylosis (Africa, Citation1931).