Table 4: Prevalence of bacteria isolated on documents exhibiting different physiological characteristic.
Type of document
(CFU · cm−2)
TAB
AB
PB
Acidifying B
Sulphite RB ( sp.)
M1
3.5 104
1.1 104
4.2 103
−
−
M2
7.1 105
3.0 104
3.0 105
−
−
M3
20
—
3
+
−
L1
2
—
—
−
−
F1
2.2 103
3.4 103
2.3 103
+
+
F2
3.0 104
1.0 10
3.7 104
−
−
F3
3.0 104
2.5 104
3.0 104
−
−
F3A
1.2 105
7.2 103
2.4 105
−
+
F4
3.9 104
—
1.6 104
−
+
P1a
1.3 103
—
20
+
−
P1b
4.0 102
3
3
+
−
P2
1.1 106
3 103
1.1 103
+
+
TAB: total aerobic bacteria determined on nutrient agar; AB: amylolytic bacteria determined on starch agar; PB: proteolytic bacteria determined on Frazier gelatin agar; Acidifying B: acidifying bacteria determined on broth for total acidifying bacteria; sulphite RB: sulphite reducing bacteria determined on reinforced Clostridium medium (DRCM).