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[Course of Trypanosoma musculi infections in NMRI mice (author's transl)]
Abstract:
The trypanosomes multiply during prepatency after minimal infection by a factor of 2.2-3.6 per day. During patency, increase of trypanosome number in the peripheral blood is basically non-logarithmic as the actual proliferating forms remain hidden in special vascular areas (kidney, placenta). The mean increase during patency is approximately linear, typically by 1-10 trypanosomes per 10(4) erythrocytes per day, and depends on the number of infective organisms introduced. - Length of parasitemia is 13-40 days, it is partly determined genetically. Prolonged parasitemias, very low in the later stages, were seen in mice preinfected with Trypanosoma congolense. - In 1 mouse with minimal infection, parasitemia only became patent 63 days after infection under the stress of an added infection with Trypanosoma brucei. - Parasitemia can be terminated by antiserum. Application of antiserum 3 or 4 days after infection may even suppress the development of immunity and priming. - Massive reinfection leads to parasitemia of up to 8 days duration without parasite multiplication.
Insights
Trypanosome infections show rapid multiplication before symptoms appear. Parasitemia during illness is linear, influenced by infection dose and host genetics, and can be managed with antiserum.
Area of Science:
- Parasitology
- Immunology
- Veterinary Medicine
Context:
- Trypanosomiasis, a significant disease in livestock and humans, is caused by protozoan parasites of the genus Trypanosoma.
- Understanding the dynamics of parasite multiplication and host response is crucial for disease control and treatment strategies.
Purpose:
- To elucidate the multiplication kinetics of trypanosomes during different stages of infection.
- To investigate factors influencing the duration and severity of parasitemia.
- To assess the impact of antiserum treatment on parasite load and host immunity.
Summary:
- Trypanosomes exhibit rapid daily multiplication (2.2-3.6x) during the prepatent period following minimal infection.
- During patency, parasite proliferation in peripheral blood is non-logarithmic, with active multiplication occurring in protected vascular niches.
- Parasitemia increases linearly (1-10 trypanosomes/10^4 erythrocytes/day), dependent on initial infective dose, with a duration of 13-40 days influenced by host genetics.
- Pre-infection with Trypanosoma congolense and concurrent Trypanosoma brucei infection can significantly delay patent parasitemia onset.
- Antiserum administration can terminate parasitemia and potentially inhibit immune development if given early in infection.
- Massive reinfection results in short-term parasitemia (up to 8 days) without significant parasite multiplication.
Impact:
- Provides critical insights into trypanosome infection dynamics, aiding in the development of more effective diagnostic and therapeutic interventions.
- Highlights the role of host genetics and co-infections in disease progression, informing disease management and surveillance.
- Demonstrates the potential of antiserum therapy for controlling trypanosomiasis, with implications for treatment timing and efficacy.