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Penicillin had no effect in patients negative for group A ß haemolytic streptococci
EditorP Little and colleagues state that their study and the study by Whitfield and Hughes are the largest primary care trials in patients with sore throat.1 2 This is not so, and both of these studies can be criticised on methodological grounds.
In 1987 American authors defined the 10 methodological criteria for valid randomised
clinical trials in pharyngitis in primary health care: trials should be prospective, randomised,
double blind, and placebo controlled; compliance should be checked by urine testing; there
should be a sufficient number of subjects; throat swabs should be used; the patients included
should be a representative sample; placebo and treatment groups should be comparable; and
direct observation should be used.3 The study by Little and
colleagues fulfils only seven of these 10 criteria. Compliance was not investigated, no throat
swabs were used, and direct observation
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