Determination of the numerical profile :On the result sheet, the tests are separated into groupsof 3 and a value 1, 2 or 4 is indicated for each. Byadding together the values corresponding to positivereactions within each group, a 7-digit profile number isobtained for the 20 tests of the API 20 E strip. Theoxidase reaction constitutes the 21st test and has avalue of 4 if it is positive.
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