Microbiology: An Introduction (13th Edition)
Microbiology: An Introduction (13th Edition)
13th Edition
ISBN: 9780134605180
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case, Derek Weber, Warner Bair
Publisher: PEARSON
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Chapter 6, Problem 3CAE

The number of bacteria in saliva samples was determined by collecting the saliva, making serial dilutions, and inoculating nutrient agar by the pour plate method. The plates were incubated aerobically for 48 hours at 37°C.

  Bacteria per ml Saliva
  Before UsingMouthwash After UsingMouthwash
Mouthwash 1 13.1 × 106 10.9 × 106
Mouthwash 2 11.7 × 106 14.2 × 105
Mouthwash 3 9.3 × 105 7.7 × 105

What can you conclude from these data? Did all the bacteria present in each saliva sample grow?

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Microbiology: An Introduction (13th Edition)

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