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Biomedical subjects

A Osterlund

Publications and source records attributed to A Osterlund.

20 records · Page 2Linked to original sources
PubMed1995

DNA fingerprinting of Streptococcus pyogenes from patients with recurrent pharyngotonsillitis by means of random amplified Polymorphic DNA analysis.

In recent years, several DNA fingerprinting methods have been tried for the epidemiological investigation of Streptococcus pyogenes isolates. We chose the Random Amplified Polymorphic DNA (RAPD) method for the typing of pre- and post-antibiotic treatment S. pyogenes isolates obtained from 14 patients with pharyngotonsillitis. Isolates from 4 patients had been collected 10 years earlier than from the others. Hence epidemiological connections between the strains were unlikely. Both pre- and post-antibiotic treatment isolates showed identical RAPD patterns, indicating that recurrences in these patients had been caused by homologous strains of S. pyogenes. It was possible by means of RAPD to differentiate between 12 different T-types and occasionally between clones of the same serotype of S. pyogenes. The RAPD method is an easier alternative to traditional DNA-typing techniques and provides quick results with minimal technical complexity.

Bacterial Typing Techniques↗
PubMed1995

Are penicillin treatment failures in Arcanobacterium haemolyticum pharyngotonsillitis caused by intracellularly residing bacteria?

Arcanobacterium haemolyticum is an infrequent agent of pharyngotonsillitis in children and young adults. Despite the fact that A. haemolyticum is fully sensitive to penicillin in vitro, penicillin treatment failures are frequent. The ability of A. haemolyticum to invade HEp-2 cells and survive intracellulary was investigated. All 12 strains tested, of which 10 were isolated from patients with pharyngotonsillitis, and 2 were reference strains, were internalized by the HEp-2 cells. Four strains tested further, one of the reference strains and 3 of the clinical isolates, proved able to survive intracellularly for 4 days, thus creating intracellular reservoirs of bacteria. It was also shown that erythromycin, an antibiotic known to penetrate well intracellularly, efficiently killed these bacteria.

Actinomycetaceae↗