Abstract The current study proposes to investigate the diversity and phylogeny of trypanosomes parasitizing wild birds from the Brazilian Atlantic Forest. Cytological examination was carried out by light microscopy of blood smears and positive birds were selected for amplification of the 18S rDNA sequence through PCR. The resulting amplicons were subjected to purification, cloning, and sequencing analysis. Phylogenetic reconstruction was conducted, including all avian trypanosomes representative’s lineages. A total of ten bird samples from species of Turdus flavipes (N=1/12), T. albicollis (N=1/8), Tachyphonus coronatus (N=6/121), Thamnophilus caerulescens (N=1/22) and Synallaxis spixi (N=1/8) were positive for Trypanosoma spp. In the six specimens of T. coronatus, five distinct lineages of Trypanosoma spp. 18S-rRNA were observed in ninety sequences obtained, and using the strategy of cloning independent PCR, it was possible to observe that two of them were related to T. avium (JB01/JB02), and three were closed related to T. bennetti (JB03/ JB04/JB05). Addionaly, all fifteen sequences obtained from T. caerulescens/ S. spixi/T. flavipes/T. albicollis were identical. The present research is the first study to access molecular diversity and polyparasitism by avian trypanosomes in Brazil. The current research exhibits the wide genetic variability in avian trypanosomes and its non-specific relationship with its avian hosts. Forest S PCR purification analysis conducted representatives representative s N=1/12, N112 N N=1/12 , 1 12 (N=1/12) T N=1/8, N18 N=1/8 8 N=6/121, N6121 N=6/121 6 121 (N=6/121) N=1/22 N122 22 (N=1/22 (N=1/8 spp 18SrRNA SrRNA rRNA JB01/JB02, JB01JB02 JBJB JB01/JB02 JB01 JB02 JB (JB01/JB02) JB03/ JB03 (JB03 JB04/JB05. JB04JB05 JB04/JB05 . JB04 JB05 JB04/JB05) Addionaly spixiT spixi/T flavipesT flavipes/T identical Brazil nonspecific non specific hosts N11 N=1/1 (N=1/12 N1 N=1/ N612 N=6/12 (N=6/121 N=1/2 N12 2 (N=1/2 (N=1/ JB01JB0 JB01/JB0 JB0 (JB01/JB02 (JB0 JB04JB0 JB04/JB0 (N=1/1 N=1 N61 N=6/1 (N=6/12 (N=1 JB01JB JB01/JB (JB01/JB0 (JB JB04JB JB04/JB N= N6 N=6/ (N=6/1 (N= (JB01/JB N=6 (N=6/ (N (N=6

The avian malaria caused by Plasmodium juxtanucleare in Gallus gallus, is a tipical plasmodiose from Brazilian gallinaceous. This disease can causes morbidy and mortality in its vertebrate hosts. This work was conducted at Boa Vista farm, Municipality of Santa Bárbara do Tugúrio, Minas Gerais, Brazil and the ours objectives were to evaluate the hight prevalence found in previous studies and to accompany the variation of the erytrocytic forms during one year. The bloods smears, dyed with Giemsa were examined in microscopy immersion. Twenty five half-breed fowls were accompany duting one year, monthly (from November/00 to May/01) and biweekly (from June/01 to October/01). The erytrocytic forms were registered and quantified by the observation of 100 microscopic fields. Was verified a prevalence of 100% by P. juxtanuclerare, but there wasn't statistics correlation between the increase of the erytrocytic forms during the year. The trophozoites were the more abundant form found in this studie

Este trabalho sobre a malária aviária causada pelo Plasmodium juxtanucleare em Gallus gallus no Brasil, foi realizado no sítio Boa Vista (21º15'12"S, 43º27'16"W), município de Santa Bárbara do Tugúrio, Minas Gerais, e teve como objetivos reavaliar a prevalência de 100% encontrada em estudos anteriores e acompanhar a variação dos estádios eritrocíticos do parasito ao longo de um ano na região. Sob microscopia em imersão foram examinados esfregaços sangüíneos de 25 aves mestiças, corados pelo Giemsa. As amostras foram coletadas ao longo de um ano, mensalmente de novembro/00 a maio/01 e quinzenalmente de junho/01 a outubro/01. Os estádios eritrocíticos foram quantificados pela observação de 100 campos microscópicos. Foi constatada prevalência de 100% por P. juxtanuclerare na região. Não houve correlação estatisticamente significativa entre o aumento dos estádios eritrocíticos em relação às coletas ao longo do ano. O estádio de trofozoíto foi predominante durante todo o período de estudo