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. Author manuscript; available in PMC: 2012 Oct 1.
Published in final edited form as: J Endod. 2011 Oct;37(10):1337–1344. doi: 10.1016/j.joen.2011.06.028

Table 3.

Bacterial colonies identified and their antibiotic resistance minimum inhibitory concentration (MIC) mg

Sample Bacterial culture O2
Req
Amoxicillin Augmentin Amifloxacin* Doxycycline** Tetracycline Metronidazole Clinda-
mycin
Tige-
cycline

1 Propionibacterium acnes An 0.032 0.047 0.19 0.19 0.5 >256 0.032 0.094
2 alpha Streptococcus spp. (viridans gp) Ae ≤ 0.016 ≤ 0.016 0.032 ≤ 0.016 0.19 >256 ≤ 0.016 ≤ 0.016
2 Moraxella spp. Ae 0.5 0.5 0.047 0.25 0.25 >256 24 0.38
2 Parvimonas micra An ≤ 0.016 ≤ 0.016 >32 0.75 0.5 0.064 0.25 ≤ 0.016
2 Prevotella corporis An 0.094 0.032 0.25 2 64 >256 0.032 0.032
2 Prevotella intermedia An 3 ≤ 0.016 0.25 4 6 0.032 >256 0.094
4 Prevotella denticolla An 0.032 ≤ 0.016 0.25 0.064 0.19 0.19 ≤ 0.016 0.125
4 Prevotella intermedia An 3 0.064 0.25 3 12 0.064 ≤ 0.016 0.064
4 Prevotella buccae An 16 0.094 0.25 1.5 6 0.125 ≤ 0.016 0.094
7 alpha Streptococcus spp. (viridans gp) Ae 0.19 0.125 0.125 48 48 >256 >256 ≤ 0.016
8 Fusobacterium spp. An ≤ 0.016 ≤ 0.016 0.047 ≤ 0.016 0.064 0.032 ≤ 0.016 ≤ 0.016
8 Peptostreptococcus spp. An 0.032 ≤ 0.016 0.047 ≤ 0.016 0.19 0.125 ≤ 0.016 0.047
9 Fusobacterium spp. An ≤ 0.016 ≤ 0.016 0.032 ≤ 0.016 0.064 ≤ 0.016 ≤ 0.016 0.023
9 Peptostreptococcus spp. An ≤ 0.016 0.125 0.064 0.25 1 ≤ 0.016 32 0.125
9 Prevotella buccae An 8 0.064 0.25 0.047 0.19 0.19 >256 0.25
10 Fusobacterium spp. An ≤ 0.016 ≤ 0.016 0.023 0.023 0.047 ≤ 0.016 ≤ 0.016 ≤ 0.016
10 Peptostreptococcus spp. An 0.047 ≤ 0.016 ≤ 0.016 0.19 0.25 ≤ 0.016 ≤ 0.016 0.064
11 Propionibacterium acnes An 0.094 ≤ 0.016 0.125 0.064 0.19 >256 ≤ 0.016 ≤ 0.016
13 Lactobacillus spp. An 0.047 0.032 >32 0.75 1.5 >256 4 0.032
13 Lactobacillus spp. An 0.023 0.047 >32 0.5 1.5 >256 4 0.047
15 Peptostreptococcus spp. An ≤ 0.016 ≤ 0.016 >32 ≤ 0.016 0.064 ≤ 0.016 ≤ 0.016 ≤ 0.016
15 Peptostreptococcus spp. An 1 0.125 0.125 0.25 0.75 ≤ 0.016 0.25 0.75
15 Prevotella intermedia An 0.5 ≤ 0.016 0.5 3 12 0.125 ≤ 0.016 0.032
16 alpha Streptococcus spp. (viridans gp) Ae 0.5 0.5 0.25 0.125 0.38 >256 48 0.064

Resistant 1 0 4 1 2 9 6 0
Susceptible 23 24 20 23 21 15 18 24
% susceptibility 95.8 100.0 83.3 95.8 87.5 62.5 75.0 100.0

Ae: Aerobic, An: anaerobic; gray boxes: resistant to antibiotic.

*

Other fluoroquinolones resistance >2–8 mg

**

Used threshold for tetracycline