19 / 199
996
B
ird
et al
.:
J
ournal of
aoaC i
nternational
V
ol
.
99, n
o
.
4, 2016
Discussion
Although one laboratory experienced issues with the
lysis procedure, no negative feedback was provided by the
collaborating laboratories in regard to the performance of
the 3M MDA 2 –
Salmonella
method. During the evaluation,
a small number of laboratories recovered
Salmonella
in
their uninoculated control data for both the raw ground beef
and peanut butter test portions. Additional identification
work was conducted on these isolates at the collaborating
laboratories and the coordinating laboratory. For the raw
ground beef, the isolates recovered from Laboratories
3, 12, and 16 all serotyped as a different serovar from the
inoculating culture, possibly indicating the presence of low-
level contamination of
Salmonella
in the matrix that was not
detected during the initial background screen. For peanut
Figure 3. POD values of candidate method versus reference method for creamy peanut butter.
Figure 4. dPOD values of candidate method versus reference method for creamy peanut butter.