{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,4,5]],"date-time":"2022-04-05T15:11:21Z","timestamp":1649171481162},"reference-count":35,"publisher":"FapUNIFESP (SciELO)","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Rev. Inst. Med. trop. S. Paulo"],"published-print":{"date-parts":[[1995,8]]},"abstract":"<jats:p>In the present study we report the results of an analysis, based on ribotyping of Corynebacterium diphtheriae intermedius strains isolated from a 9 years old child with clinical diphtheria and his 5 contacts. Quantitative analysis of RFLPs of rRNA was used to determine relatedness of these 7 C.diphtheriae strains providing support data in the diphtheria epidemiology. We have also tested those strains for toxigenicity in vitro by using the Elek's gel diffusion method and in vivo by using cell culture method on cultured monkey kidney cell (VERO cells). The hybridization results revealed that the 5 C.diphtheriae strains isolated from contacts and one isolated from the clinical case (nose case strain) had identical RFLP patterns with all 4 restriction endonucleases used, ribotype B. The genetic distance from this ribotype and ribotype A (throat case strain), that we initially assumed to be responsible for the illness of the patient, was of 0.450 showing poor genetic correlation among these two ribotypes. We found no significant differences concerned to the toxin production by using the cell culture method. In conclusion, the use of RFLPs of rRNA gene was successful in detecting minor differences in closely related toxigenic C.diphtheriae intermedius strains and providing information about genetic relationships among them.<\/jats:p>","DOI":"10.1590\/s0036-46651995000400002","type":"journal-article","created":{"date-parts":[[2006,4,28]],"date-time":"2006-04-28T19:58:59Z","timestamp":1146254339000},"page":"291-296","source":"Crossref","is-referenced-by-count":2,"title":["Genetic relationships of Corynebacterium diphtheriae strains isolated from a diphtheria case and carriers by restriction fragment length polymorphism of rRNA genes"],"prefix":"10.1590","volume":"37","author":[{"given":"Claudio Tavares","family":"Sacchi","sequence":"first","affiliation":[{"name":"Adolfo Lutz Institute, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ana Paula Silva de","family":"Lemos","sequence":"additional","affiliation":[{"name":"Adolfo Lutz Institute, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Silvana Tadeu","family":"Casagrande","sequence":"additional","affiliation":[{"name":"Adolfo Lutz Institute, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alice Massumi","family":"Mori","sequence":"additional","affiliation":[{"name":"Adolfo Lutz Institute, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carmecy Lopes de","family":"Almeida","sequence":"additional","affiliation":[{"name":"Center for Epidemiological Surveillance of Osasco, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"530","reference":[{"key":"ref1","doi-asserted-by":"crossref","first-page":"325","DOI":"10.1016\/0923-2508(89)90024-7","article-title":"Bacterial molecular epidemiology based on a non-radioactive probe complementary to ribosomal RNA","volume":"140","author":"ALTWEGG M.","year":"1989","journal-title":"Res. 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