The standard recognizes that factors outside of the control of the manufacturer may impact the results ofthis test. These factors can include plate or impinger handling errors, air currents in the test lab, labcontamination with the test organism, or problems with the test equipment. It is not always possible for thetest agency to find these factors following a failing test. When the results of a test exceed the maximumallowed recovery for B. subtilis, a confirming test may be completed. When the maximum allowed recoveryfor B. subtilis was from a single replicate, the replicate may be replaced with two passing replicates. Whenthe maximum allowed recovery for B. subtilis was from two or three replicates, the test may be replacedwith a full test that includes three passing replicates.