PNEUMOCOCCI, LIVING OR DEAD, ARE SOLUBLE IN BILE WHEN: (a) the autolytic enzymes are still present in a potentially active form; (b) conditions are favorable for enzymatic action. Bile solubility of pneumococci involves as a necessary step one, or a few, of the many stages of the autolytic complex. These observations hold true for the disruption of pneumococci by freezing and thawing, by previous desiccation with cold acetone, and by dilute solutions of antiseptics. A possible mechanism is discussed to account for these forms of lysis.
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http://dx.doi.org/10.1084/jem.66.1.101 | DOI Listing |
mSphere
December 2022
Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, Connecticut, USA.
Nasopharyngeal swabs are considered the gold-standard sample type for the detection of Streptococcus pneumoniae carriage, but recent studies have demonstrated the utility of saliva in improving the detection of carriage in adults. Saliva is generally collected in its raw, unsupplemented state, unlike nasopharyngeal swabs, which are collected into stabilizing transport media. Few data exist regarding the stability of pneumococci in unsupplemented saliva during transport and laboratory storage.
View Article and Find Full Text PDFJ Clin Microbiol
October 2007
Kenya Medical Research Institute/Wellcome Trust Research Program, Centre for Geographic Medicine Research-Coast, P.O. Box 230, Kilifi, Kenya.
We compared nasopharyngeal swabs against nasal wash cultures for detecting colonizing pneumococci and examined the effect of frozen storage in skim milk-tryptone-glucose-glycerin on culture. Among the 55 children with positive nasal wash cultures, swab cultures were positive for 47 (85%). Of the 96 swabs positive on direct plating, 94 (98%) were positive when recultured after freezing.
View Article and Find Full Text PDFJ Clin Microbiol
December 2003
Department of Medical Microbiology, University College London, Royal Free Campus, London NW3 2PF, United Kingdom.
The need to design effective Streptococcus pneumoniae vaccines and to monitor resistance means that it is essential to have efficient methods to determine carriage rates. Two liquid media, consisting of skim milk, glycerol, glucose, and tryptone soya broth (STGG) or skim milk, glycerol, and glucose (SGG) alone, were evaluated for their ability to maintain pneumococcal viability. Optimal recovery of S.
View Article and Find Full Text PDFEur J Clin Microbiol Infect Dis
September 2002
University of Illinois College of Medicine at Peoria, 531 NE Glen Oak Avenue, Peoria, IL 61637, USA.
This report describes the development and evaluation of a selective egg-based medium for ambient-temperature storage and transport of nasopharyngeal (NP) swabs in colonization studies of Streptococcus pneumoniae. Egg-thioglycolate-antibiotic (ETA) medium is based on Dorset's egg medium but made with thioglycolate broth and the addition of gentamicin (3 mg/l), nalidixic acid (15 mg/l), and amphotericin B (2.5 mg/l).
View Article and Find Full Text PDFMeningococci, pneumococci, and hemophilic bacilli may be stored at -70 degrees C. Only half (54.4 percent) of Meningococcal cultures were viable after 11 months storage, 41.
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