Thermo Scientific™ SXT Blood Agar

Description

• Selectively isolate beta-hemolytic group A streptococci from throat cultures and upper respiratory specimens using Thermo Scientific™ Remel™ SXT Blood Agar
• Pacifico at al
• demonstrated the isolation of β-hemolyic streptococci is improved with the use of a selective medium which inhibits oropharyngeal commensal microbial flora 1
• In 1977, Gunn et al
• introduced a selective medium containing sulfamethoxazole and trimethoprim in a tryptic soy agar base supplemented with 5% sheep blood 2
• In 1979, Kurzynski et al
• proved that streptococci were more frequently isolated on SXT sheep blood agar 3
• Clinical assessment alone is unreliable in distinguishing streptococcal and non-streptococcol pharyngitis 4
• Serious medical complications may follow pharyngitis caused by group A streptococci, making bacterial examination of the throat an indispensable diagnostic tool
• Use of SXT sheep blood agar allows enhanced recovery of Lancefield groups A and B streptococci from throat cultures while inhibiting the growth of commensal microbial flora
• Ready-to-use – The convenience of prepared media Selective – Use of sulfamethoxazole plus trimethoprim (SXT) supresses growth of streptococcal groups C, F, and G and Streptococci viridans , most Enterobacteriaceae, Neisseria , and some Pseudomonas This medium contains casein and soy peptones that provide nutritious source of nitrogen, amino acids, and peptides
• Sheep blood provides growth factors and allows detection of hemolytic reactions
• Sodium chloride maintains osmotic equilibrium
• SXT (sulfamethoxazole, trimethoprim) act as selective agents to supresse most commensal microbial flora found in the oropharynx, including streptococcal groups C, F, and G and Streptococci viridans , most Enterobacteriaceae, Neisseria , and some Pseudomonas spp
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• Remel™ and Oxoid™ products are now part of the Thermo Scientific brand.