科研之友
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摘要
Dipetalogaster maxima (Uhler, 1894) is a species typical of the south of the Baja Californa peninsula, Mexico. The adaptability of Argentine strains of Trypanosoma cruzi to vectors of other latitudes could be of relevance to epidemiology as well as to xenodiagnosis. The purpose of the present study was thus to investigate whether or not there is good adaptation of T. cruzi strains (circulating in Santiago del Estero, Republic of Argentina) in D. maxima with respect to T. infestans. To this end, nymphs I of D. maxima and nymphs III of T. infestans, were used. Ten (10) xenodiagnoses for each species were made in parallel, on non-treated chronic chagasic patients with positive serology. The average blood weight sucked by each arthropod was 61.4 mg for T. infestans and 63.8 mg for D. maxima. At 30 days post inoculation, faecal material from the insects was examined with optical microscopy. It could be observed that 30% of T. infestans samples and 20% of D. maxima samples were infected. All patients who evidenced positivity with D. maxima in the xenodiagnosis also showed positivity with T. infestans. The comparison of the results on infectiousness revealed a valid statistical significance that leads to conclude that the studied T. cruzi strains from the Republic of Argentina adapt to D. maxima. In view of the significant adaptability observed in the present study, this record of infectiousness of D. maxima with T. cruzi, recorded for the first time in chronic chagasic patients in the Republic of Argentina, seems to be a useful tool for xenodiagnosis. Furthermore, in spite of the habitat and current distribution of D. maxima, this adaptability could have future epidemiological implications as a consequence of the globalization processes and climatic changes currently occurring on Earth.
- 出版日期2012-3
