evaluation of bacitracin disk for the identification of group ‘a’ beta-hemolytic streptococci
نویسندگان
چکیده
a total of 711 beta-hemolytic streptococci were isolated from throat cultures of patients during 1970-73. these strains were grouped in parallel by the precipitin and bacitracin paper disk method. the former method was established as the standard by which the bacitracin technique was compared. the difference in results was about 5.67%. the greatest error (5.4%) was seen with non-group a strains being sensitive to bacitracin. in spite of this, it was shown to be advantageous to use the bacitracin disk for primary isolation from throat cultures rather than to consider all beta-hemolytic streptococci isolated as group a, which would give a magnitude of error around 16%.
منابع مشابه
Bacitracin and coagglutination for grouping of beta-hemolytic streptococci.
Bacitracin may be used for presumptive differentiation of group A from other beta-hemolytic streptococci. Whatever criteria are used for the test, a small number of erroneous results will be obtained. With the 1,161 strains studied in this laboratory, using a zone of 10 mm or greater as indicative of group A was better than using Maxted's original criterion of any zone of inhibition for group A...
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In the study of upper respiratory infections, nose and throat cultures for beta hemolytic streptococci3 are essential. Since group A streptococci are implicated in human respiratory infections more than other groups, it is important that streptococci recovered on culture be identified as belonging to group A or not. The finding of streptococci which belong to groups other than A in the nose or ...
متن کاملGroup B beta-hemolytic streptococci causing pharyngitis.
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متن کاملThe use of bacitracin for identifying group A haemolytic streptococci.
The recognition of Lancefield's Group A as the most,commonly pathogenic members of the haemolytic streptococci has prompted several attempts at devising a rapid cultural diagnostic method such as the addition of maltose or glucose to blood agar, which alters the haemolytic activity of Group A strains (Kodama, 1937; Simmons and *Wilson, 1941). This paper describes the use of an antibiotic that i...
متن کاملRAPID IDENTIFICATION OF GROUP A STREPTOCOCCI BY PYRROLIDONYL-β-APHTHYLAMIDE HYDROLYSIS
In a clinical trial a new pyrrolidonyl-β-naphthylamide (PYR) hydrolysis test was compared with the bacitracin disk susceptibility test for accuracy in the presumptive identification of group A streptococci (GAS). Among 128 isolates of beta-hemolytic streptococci 93 group A isolates were found. The sensitivity of the PYR and bacitracin tests were similar (98.9%), but the bacitracin test had ...
متن کاملCAMP-disk test for presumptive identification of group B streptococci.
The modification of the CAMP test for goup B streptococci involved substituting a paper disk impregnated with partially purified beta-hemolysin for the staphylococcal culture that was the source of beta-hemolysin in the original test. The disk is placed onto a sheep blood agar plate beside the streak of Streptococcus being tested. The plate is then incubated aerobically at 35 degrees C. A posit...
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عنوان ژورنال:
iranian journal of public healthجلد ۳، شماره ۲، صفحات ۷۹-۸۲
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