Salmonella typhi: lisotipia VI e biotipificação em amostras oriundas de algumas regiões do Brasil

Abstract

Fez-se uma análise da distribuicão da frequência dos lisotipos VI e dos tipos fermentativos segundo o esquema de Kristensen, em 1.150 amostras de Salmonella typhi, isoladas de diferentes regiões do Brasil (Pará, Pernambuco, Bahia, Minas Gerais, Rio de Janeiro, São Paulo e Rio Grande do Sul). No computo geral, observou-se a prevalência dos lisotipos A (38,1%); Ela (18,9%); amostras VI negativas (16,6%); D6 (8,7%) I + IV (4,6%); T (2,3%) e C1 (2,1%) e a ocorrência de alguns tipos fágicos característicos para determinadas áreas (B3, C4 e 40 na Bahia; E1b, F2, G1 e L1 em São Paulo; E4 e 28 no Rio de Janeiro). Quanto a classificacão bioquímica, 55,2% das amostras caracterizaram-se no biotipo II (xilose e arabinose negativas), 44,2% no tipo fermentativo I (xilose positiva e arabinose negativas) e 0,52% no tipo III (xilose e arabinose positivas), respectivamente.

Current situation and perspectives regarding human Chagas disease in midwestern of the state of Minas Gerais, Brazil

“…The reduction in the prevalence of human infections of T. cruzi after the effective control of household vectors was predicted by Emmanuel Dias in 1957 and was observed through seroepidemiological surveys in 1965, 1974 and 1980. This reduction is consistent with the reduction observed in SP from 1968 (Dias 1959, Silva-Rocha 1979, de Souza et al 1984). Currently, the transmission of human Chagas disease has virtually disappeared in Bambuí.…”

“…These data (Dias 1974) strongly suggest that vectorial transmission of Chagas disease was halted in the late 1960s. Similar data have been recorded in the state of São Paulo (SP) since the 1970s, through systematic serological surveys of populations in areas undergoing vector control programmes, with striking reduction of T. cruzi seropositivity in younger individuals (de Souza et al 1984). According to the PAEED records, the last acute case of Chagas disease was diagnosed in Bambuí in 1969, just prior to the establishment of the surveillance work in the municipality.…”

Conventional and molecular typing of Salmonella typhi strains from Brazil

“…The analysis of S. Typhi by Vi phage-typing divided the strains into three distintic types: A, I+IV and 46. The detection of phage type 46 in the Middle-West area is presumed by the presence of imported cases and its relation to South American countries 10,11 . For example, most of the isolates from Santiago, Chile, belongs to phage type 46 25 .…”