Studies on Frog Trypanosomiasis. I. A 24-Hour Cycle in the Parasitemia Level of Trypanosoma rotatorium in Rana clamitans from Louisiana

Southworth, G. C.; Mason, G. F.; Seed, John

doi:10.2307/3276930

Cited by 23 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The periodicity of this tripanosoma seems to be related to the intensity of light to which the frog is submitted. At night the parasites are scarce 13 . In this same host, the T. parvum is more numerous in the blood at night then during the day 6 .…”

Section: Resultsmentioning

confidence: 99%

Absence of both circadian rhythm and Trypanosoma cruzi periodicity with xenodiagnosis in chronic chagasic individuals

Castro

Prata

2000

Rev. Soc. Bras. Med. Trop.

View full text Add to dashboard Cite

Xenodiagnoses were performed every 3 hours using 10 Triatoma infestans 3 rd instar for 24 to 72 hours, in 18 chronic chagasics with positive serology and/or xenodiagnosis. There was no statistically significant difference in the positivity of assays performed during the day (9:00 to 18:00h) compared to those performed at night (21:00 to 6:00h), (χ 2 = 0.1526 p = 0.696). Xenodiagnosis was performed in ten of the patients for 13 successive days but there was no periodicity detected in the positive assays. Key-words: Circadian rhythm. Trypanosoma cruzi parasitemia. Serial xenodiagnoses.Resumo Realizamos xenodiagnósticos de 3 em 3 horas com 10 ninfas do 3 0 estágio de Triatoma infestans por um período de 24 a 72 horas, em 18 chagásicos crônicos que tinham sorologia e/ou xenodiagnóstico positivos. Não houve diferença estatisticamente significante na positividade entre os testes realizados durante o dia (9:00 às 18:00h) e à noite (21:00 às 6:00h), (χ 2 = 0,1526 p = 0,696). Dez dos pacientes fizeram também xenodiagnósticos diários, durante 13 dias sucessivos, não havendo periodicidade dos testes positivos. Palavras-chaves: Ritmo circadiano. Parasitemia pelo Trypanosoma cruzi. Xenodiagnósticos seriados.

show abstract

Section: Resultsmentioning

confidence: 99%

Absence of both circadian rhythm and Trypanosoma cruzi periodicity with xenodiagnosis in chronic chagasic individuals

Castro

Prata

2000

Rev. Soc. Bras. Med. Trop.

View full text Add to dashboard Cite

show abstract

“…Cycles similar to those of microfilariae are also shown by certain trypanosomes Trypanosoma rotatorium) of frogs {Rana clamitans) at New Orleans, which have been studied by Southworth et al (1968). The trypanosomes are most numerous in the peripheral blood during the late afternoon and least numerous before dawn.…”

Section: Migration To and Fro In The Body Of The Hostmentioning

confidence: 87%

In living organisms

Hawking¹

1971

Journal of Interdisiplinary Cycle Research

View full text Add to dashboard Cite

“…A rhythmic number of parasites in the blood is common to many other parasite species. The number of Trypanosoma rotatorium in the blood of the frog [24] and Trypanosoma congolense and Trypanosoma lewisi in the blood of rodents [25, 26] varies throughout the day.…”

Section: Have Daily Rhythms Been Detected In Parasites?mentioning

confidence: 99%