IDENTIFICATION OF PIROPLASMA OF DOGS, OF THE TYPE PIROPLASMA CANIS. TRANSMISSION OF THE FRENCH STRAIN BY THE SOUTH AFRICAN TICK, HAEMAPHYSALIS LEACHI. DOUBTFUL VALUE OF THE PROOFS OF CROSSED IMMUNITY WITH THE PIROPLASMOSES
ARMY BIOLOGICAL LABS FREDERICK MD
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From the proofs of crossed artificial immunity, by inoculation of virulent blood, and natural crossed immunity by the host vectors themselves, it was found that the strains of canine piroplasmosis seem to possess different antigenic properties, even when the morphology of the parasites which cause them is identical and when their host vectors are the same. This fact has led various authors to admit the existence of different races or even different species. The canine Piroplasmae behave differently from the bovine Piroplasmae and Anaplasmae which belong to a group which confers a solid immunity against homologous or heterologous viruses and which are transmitted to them either by inoculation of blood or from the bites of ticks. The bovines hardly ever, after strong doses of a heterologous virus, present even a light feverous or parasitic infection. Furthermore this strong premunition is the basis for the vaccination used by breeders of bovines destined for export into places where the various Piroplasmae cause more or less considerable damage.
- Animal Husbandry and Veterinary Medicine