The Use of Two Culturing Methods in Parallel Reveals a High Prevalence and Diversity of Arcobacter spp. in a Wastewater Treatment Plant
Table 2
Arcobacter species detected according to the method at the 5 sampling points in the wastewater treatment plant on the 6 different sampling .
Species detected
m-PCR
Culturing method
Direct
Postenrichment
Direct
Postenrichment
A. butzleri (Ab)
19 (100)
15 (100)
22 (78.6)
24 (82.8)
A. cryaerophilus (Ac)
10 (52.6)
9 (60)
27 (96.4)
16 (55.2)
A. defluvii (Ad)
0
0
2 (7.1)
3 (10.3)
A. nitrofigilis (Anit)
0
0
1 (3.6)
0
A. cloacae (Aclo)
0
0
0
2 (6.9)
A. skirrowii (As)
0
0
1 (3.6)
2 (6.9)
A. thereius (At)
0
0
3 (10.7)
4 (13.8)
A. ellisii (Ae)
0
0
2 (7.1)
0
Sampling month
Sampling point
m-PCR
Culturing method
Direct
Postenrichment
Direct
Postenrichment
April 2009
Influent water
Ac+Ab
ND
Ac+Anit
Ac+Ad+Aclo
Primary sedimentation tank
Ac+Ab
ND
Ac+Ab+Ad
Ac+Ab
Secondary bioreactor tank
Negative
ND
Ac+Ad
Ac+Ad
Secondary sedimentation tank
Negative
ND
Negative
Ab+Ad
Effluent water
Negative
ND
Negative
Negative
June 2009
Influent water
Negative
ND
Ac+Ab
Ab
Primary sedimentation tank
Ab
ND
Ac+Ab
Ab
Secondary bioreactor tank
Negative
ND
Ac+Ab
Ab
Secondary sedimentation tank
Negative
ND
Ac
Ac+Ab
Effluent water
Negative
ND
Ac+Ab
Ab
October 2009
Influent water
Ac+Ab
ND
Ac
Ac+Ab
Primary sedimentation tank
Ac+Ab
ND
Ac+Ab
Ac+Ab
Secondary bioreactor tank
Negative
ND
Ac
Ab
Secondary sedimentation tank
Ab
ND
Ac+Ab
Ac+Ab
Effluent water
Negative
ND
Ac+Ab
Ab
May 2011
Influent water
Ab
Ab+Ac
Ac+At
Ab+Ac+At
Primary sedimentation tank
Ab+Ac
Ab+Ac
Ab+Ac+At
Ac+At
Secondary bioreactor tank
Ab
Ab+Ac
Ab+Ac+As
Ac+As
Secondary sedimentation tank
Ab
Ab+Ac
Ab+Ac
Ab+Ac
Effluent water
Ab
Ab+Ac
Ab+Ac
Ab+Ac
June 2011
Influent water
Ab+Ac
Ab
Ab+Ac+Ae
Ab+As
Primary sedimentation tank
Ab+Ac
Ab
Ab+Ac
Ab+Ac
Secondary bioreactor tank
Ab
Ab
Ab+Ac+At
At
Secondary sedimentation tank
Ab
Ab
Ab+Ac
Ab+Ac+At
Effluent water
Ab
Ab
Ab+Ac
Ab
September 2011
Influent water
Ab+Ac
Ab+Ac
Ab+Ac+Ae
Ab+Aclo
Primary sedimentation tank
Ab+Ac
Ab+Ac
Ab+Ac
Ab
Secondary bioreactor tank
Ab+Ac
Ab+Ac
Ab+Ac
Ab+Ac
Secondary sedimentation tank
Negative
Ab
Ab
Ab
Effluent water
Negative
Ab+Ac
Ab+Ac
Ab+Ac
Total No. positive samples (%)
19/30 (63.3)
15/15 (100)
28/30 (86.7)
29/30 (86.7)
identified species are only mentioned once, independently of the number of strains obtained from each specific sample. m-PCR: multiplex PCR Houf et al., 2000 [19] ND: not done.