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These included the use of certain culture media; failure to standardise the inoculum; inoculation by loop rather than by swab; failure to use control organisms; failure to measure zone sizes; the use of discs containing a high content of penicillin to test susceptibility to penicillin, and the use of high content discs for testing erythromycin, tetracycline, and chloramphenicol.<\/jats:p>","DOI":"10.1136\/jcp.41.4.384","type":"journal-article","created":{"date-parts":[[2007,6,9]],"date-time":"2007-06-09T00:50:46Z","timestamp":1181350246000},"page":"384-387","source":"Crossref","is-referenced-by-count":7,"title":["Antimicrobial susceptibility testing of Streptococcus pneumoniae: quality assessment results."],"prefix":"10.1136","volume":"41","author":[{"given":"J J","family":"Snell","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R C","family":"George","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S F","family":"Perry","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Y J","family":"Erdman","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[1988,4,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"82","DOI":"10.1136\/jcp.35.1.82","article-title":"The United Kingdom national microbiological quality assessment scheme","volume":"35","author":"Snell, J.J.S.; de Mello, J.V.; Gardner, P.S.","year":"1982","unstructured":"Snell JJS, de Mello JV, Gardner PS. 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