1978
DOI: 10.3181/00379727-157-40062
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True and False Prophylaxis in Experimental Trypanosomiasis

Abstract: It is generally accepted that, during the period of prophylaxis with chemoprophylactic agents, the host remains protected against the immediate infection, as well as against future infections. However, it has been described how Trypanosoma congolense "broke through the protective cover" of prophylactic phenanthridium compounds, inducing an intermittent type of infection in the protected animal; characteristically, these "breakthrough" strains, when transferred to untreated animals, lead to a mortal infection a… Show more

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Cited by 4 publications
(4 citation statements)
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“…While no curative effect of ethidium was observed under our experimental conditions, there was an apparent prophylactic action following the ethidium treatment of T. congolense-infected rabbits. The concept of 'true or false prophylaxis' was described by Ercoli (1978) in experiments with an aromatic diamidine and our results are in agreement with his finding that apparent chemotherapeutic prophylaxis may merely be an extension of a sub-patent parasitaemia rather than absolute protection. Following a study of the prophylactic actions of ethidium in cattle, Leach et al (1955) commented similarly: 'it is possible that the drug does not protect completely but rather allows the establishment of a suppressed infection which is only occasionally detected in the bloodstream'.…”
Section: Discussionsupporting
confidence: 91%
“…While no curative effect of ethidium was observed under our experimental conditions, there was an apparent prophylactic action following the ethidium treatment of T. congolense-infected rabbits. The concept of 'true or false prophylaxis' was described by Ercoli (1978) in experiments with an aromatic diamidine and our results are in agreement with his finding that apparent chemotherapeutic prophylaxis may merely be an extension of a sub-patent parasitaemia rather than absolute protection. Following a study of the prophylactic actions of ethidium in cattle, Leach et al (1955) commented similarly: 'it is possible that the drug does not protect completely but rather allows the establishment of a suppressed infection which is only occasionally detected in the bloodstream'.…”
Section: Discussionsupporting
confidence: 91%
“…The occurrence of a trypa nostatic drug action, inferred from the 'false prophylaxis' [1], becomes unequivocal by these findings.…”
Section: Discussionmentioning
confidence: 57%
“…The atypical (delayed, intermittent and/or slow) course of the reinfection in the other cases mentioned, is attributed to the action of further reduced, but not completely inhibitory, residual drug concentrations. The drug retention 43-52 days after 20-40 mg/kg pentamidine injec tion was not sufficient to influence the de velopment of the reinfection, in accordance with the shorter transient prophylactic effect of this drug, permitting the development of parasitemia on average 21 and 27 days after administration of 35.5 and 75 mg/kg, re spectively [1].…”
Section: Resultsmentioning
confidence: 92%
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