WebApr 12, 2024 · Optochin susceptibility testing is a major assay used for presumptive identification of Streptococcus pneumoniae. Still, atypical optochin-resistant (Opt r) pneumococci have been reported and... WebMay 21, 2008 · Although our prevalence of optochin resistance among AccuProbe-positive isolates would decrease from 12.1% to 11.6% if the S. pseudopneumoniae isolates were excluded, both values are higher than those in prior reports. Optochin-susceptible nonpneumococcal isolates with negative AccuProbe results have also been reported …
Bacitracin Susceptibility Test - Procedure, Uses and Interpretation
WebA positive result is reported if a zone radius (on a 6 mm disc) is >8 mm. Optochin sensitivity can be used in primary plates from specimens (e.g. sputum) likely to be contaminated by … WebApr 9, 2024 · Identify factors that predispose individuals to Streptococcus pneumoniae infection, and describe current recommendations for vaccine administration to at-risk individuals. List the antimicrobial agents that have been linked to drug-resistant Streptococcus pneumoniae . Author (s) William A. Rutala, PhD, MPH csu building codes
Optochin susceptibility test: Principle, Procedure and …
WebPositive: The organism produces the enzyme catalase, which breaks down hydrogen peroxide into water and oxygen. Optochin sensitivity: Positive: The organism is sensitive to the antibiotic optochin, which is suggestive of Staphylococcus aureus. Bile solubility: Positive: The organism is able to tolerate the bile salts in the medium. Indole: Negative WebOptochin originally used in the very early 1900's as a drug to treat pneumococcal pneumonia but discontinued by the 1920s due to severe side effects (e.g. loss of vision!) now used only for differentiation of S. … A positive presumptive identification of S. pneumoniae is made when a well defined zone of inhibition results around the impregnated disk. Other alpha-hemolytic streptococci do not display this clear zone of inhibition when in … See more Positive: Streptococcus pneumoniae (ATCC ® 6305), S. pneumoniae (ATCC 49619). Negative: Streptococcus … See more A presumptive identification for S. pneumoniaecan be made if the alpha-hemolytic colony produces a zone of inhibition of 14mm or greater around the disk. Organisms producing smaller zone sizes should be tested … See more Optochin lyses pneumococci (positive test), but alpha-streptococci are resistant (negative test), thus aiding in its identification. See more csub university handbook