15mL
of plate count agarwas poured into eachPetri dish to disperse
thebacteriabyswirlinggently. Allplatingshallbeperformed
in duplicate. The Petri dishes were inverted and incubated at
37
∘
C for 24h. After incubation, the number of colonies in the
Petri dishes was counted. For each dilution series, record the
number of colonies recovered to two significant figures, as
well as the dilution factor for the plates used for counting