RESUMO
A prospective multicenter study on invasive infections caused by beta-hemolytic streptococci was performed over 6 months and involved 42 centers from 16 cities in Argentina. Among 33 isolates recovered, 9 group G Streptococcus isolates (39.1%) and 2 group C Streptococcus isolates (20%) exhibited resistance to tetracycline and harbored the tet(M) gene. Genealogical analysis revealed that tetracycline resistance has a polyclonal origin in Argentina.
Assuntos
Proteínas de Bactérias/genética , Streptococcus/genética , Resistência a Tetraciclina/genética , Argentina , Streptococcus/classificação , Streptococcus/isolamento & purificaçãoRESUMO
The complete cDNA sequence corresponding to the genomic RNA of a South American strain of potato virus X (PVXc) is reported. The sequence (6432 nucleotides) contains five open reading frames coding for polypeptides with molecular weights of 165.3, 24.3, 12.3, 7.6 and 25.0 and displays an overall homology of 77.4% with those previously reported for two European isolates. Comparison of amino acid sequences shows an average homology of 87%. Two major domains of variability, located between amino acids 476-615 of ORF 1 and 64-100 of ORF 5, are identified. Sequence similarities between RNA stretches lying upstream of ORFs 2, 4 and 5, and at the 3'-non coding regions of PVX and other plus-strand RNA viruses are described.