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Table 2 Identified bacterial species in counterfeit and illegal PDE inhibitors in the Canadian study

From: Microbiological contamination in counterfeit and unapproved drugs

Product Identified bacteria
Approved PDE5 inhibitors
Sildenafil 25 mg n/a
Sildenafil 50 mg n/a
Sildenafil 100 mg n/a
Tadalafil 2.5 mg n/a
Tadalafil 5 mg n/a
Tadalafil 10 mg n/a
Tadalafil 20 mg n/a
Vardenafil 5 mg n/a
Vardenafil 10 mg n/a
Vardenafil 20 mg n/a
Counterfeit PDE5 inhibitors
Sildenafil 100 mg #1 Bacillus spp.
Sildenafil 100 mg #2 Serratia spp., Paenibacillus polymyxa, Paenibacillus amylolyticus, Bacillus ssp., Paenibacillus gluconolyticus, Corynebacterium spp., Brevibacillus borstelensis
Sildenafil 100 mg #3 Brevibacillus choshinensys, Bacillus spp.
Sildenafil 100 mg #4 Bacillus ssp.
Sildenafil 100 mg #5 Bacillus spp.
Sildenafil 100 mg #6 Bacillus ssp., Brevibacillus choshinensys, Virgibacillus pantothenticus, Alicyclobacillus acidoterrestris, Sphingomonas paucimobilis, Paenibacillus polymyxa, Propionibacterium acnes, Brevibacillus borstelensis, Bacillus spp.
Sildenafil 100 mg #7 Micrococcus luteus
Sildenafil 100 mg #8 Bacillus ssp., Propionibacterium acnes
Sildenafil 100 mg #9 Paenibacillus amylolyticus
Sildenafil 100 mg #10 Brevibacillus choshinensys
Sildenafil 100 mg #11 n/a
Sildenafil 100 mg #12 n/a
Tadalafil 20 mg #13 Bacillus ssp.
Tadalafil 20 mg #14 Kocuria rosea, Bacillus pumilus
Tadalafil 10 mg #15 Bacillus spp
Tadalafil 10 mg #16 Bacillus spp
Tadalafil 10 mg #17 Granulicatella adiacens, Streptococcus salivarus, Bacillus spp
Tadalafil 10 mg #18 Bacillus spp
Tadalafil 10 mg #19 Bacillus spp
Vardenafil 20 mg #20 Bacillus spp
Vardenafil 20 mg #21 n/a
Unapproved PDE5 inhibitors
Tadalafil #22 Paenibacillus lautus, Paenibacillus durus, Paenibacillus glucanolyticus, Bacillus spp.
Sildenafil #23 Bacillus ssp., Paenibacillus spp.
Vardenafil #24 Bacillus ssp.
Tadalafil #25 Staphylococcus epidermidis, Bacillus spp.
PDE5 inhibitor #26 Bacillus spp.,
Tadalafil #27 Bacillus spp.
Sildenafil #28 Bacillus spp.
Sildenafil #29 Bacillus spp.
Sildenafil #30 Bacillus spp., Sphingomonas paucimobilis, aerobic Actinomycetes
Sildenafil #31 Bacillus spp.
Tadalafil #32 Bacillus spp.
Tadalafil #33 Bacillus spp.
Tadalafil #34 Granulicatella adiacens, Streptococcus salivarus, Bacillus spp.
Sildenafil #35 Bacillus spp.
Sildenafil #36 Bacillus spp., Micrococcus spp.
Sildenafil #37 Bacillus spp.
Sildenafil #38 Bacillus spp.
Sildenafil #39 Bacillus spp.
Tadafenil #40 Bacillus spp.
Sildenafil #41 Bacillus spp.
Sildenafil #42 Bacillus spp.
Tadafenil #43 Bacillus spp., Staphylococcus hominis
Sildenafil #44 Bacillus spp.
Sildenafil #45 Bacillus spp.
Sildenafil #46 Bacillus spp.
Sildenafil #47 Bacillus spp.
Sildenafil #48 Bacillus spp.
Sildenafil #49 Bacillus spp.
Sildenafil #50 Bacillus spp.
Sildenafil #51 Bacillus spp.
Sildenafil #52 Bacillus spp.
  1. n/a: Not applicable.Bacterial species identified in the contaminated samples of Figure 1.