TABLE 2.
Prevalence of hemolytic and proteolytic activity and virulence genes in fish and clinical Aeromonas isolates
| Species and source | No. (%) of isolatesa
|
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total | Hemolysis | Proteolysis | act | aerA | alt | ascF-ascG | aexT | ascV | ast | col | ela | hlyA | lip | |
| A. caviae | 57 | |||||||||||||
| Fish | 43 | 31 (72.1) | 30 (69.8) | 0 | 0 | 21 (48.8)** | 0 | 0 | 0 | 0 | 30 (69.8) | 43 (100) | 0 | 11 (25.6) |
| Human | 14 | 13 (92.9) | 9 (64.3) | 1 (7.1) | 0 | 0 | 0 | 0 | 0 | 0 | 14 (100)* | 14 (100) | 0 | 14 (100)*** |
| A. veronii | 44 | |||||||||||||
| Fish | 33 | 32 (97.0) | 31 (93.9) | 26 (78.8) | 0 | 12 (36.4) | 0 | 4 (12.1) | 2 (6.1) | 5 (15.2) | 30 (90.9)*** | 5 (15.2) | 0 | 2 (6.1) |
| Human | 11 | 11 (100) | 11 (100) | 11 (100) | 0 | 2 (18.2) | 1 (9.1) | 2 (18.2) | 7 (63.6)*** | 0 | 2 (18.2) | 0 | 0 | 3 (27.3) |
| A. dhakensis | 24 | |||||||||||||
| Fish | 10 | 10 (100) | 10 (100) | 4 (40) | 3 (30) | 10 (100) | 2 (20) | 0 | 1 (10) | 1 (10) | 10 (100) | 10 (100) | 10 (100) | 10 (100) |
| Human | 14 | 14 (100) | 14 (100) | 4 (28.6) | 4 (28.6) | 14 (100) | 2 (14.3) | 0 | 2 (14.3) | 0 | 14 (100) | 14 (100) | 13 (92.9) | 14 (100) |
| A. hydrophila | 16 | |||||||||||||
| Fish | 10 | 10 (100) | 10 (100) | 1 (10) | 1 (10) | 10 (100) | 3 (30) | 1 (10) | 0 | 1 (10) | 10 (100) | 10 (100) | 10 (100) | 10 (100) |
| Human | 6 | 6 (100) | 6 (100) | 2 (33.3) | 2 (33.3) | 6 (100) | 3 (50) | 1 (16.7) | 3 (50) | 6 (100)*** | 6 (100) | 6 (100) | 6 (100) | 6 (100) |
| A. taiwanensis | 7 | |||||||||||||
| Fish | 6 | 3 (50) | 6 (100) | 0 | 0 | 2 (33.3) | 0 | 6 (100) | 0 | 0 | 0 | 6 (100) | 0 | 0 |
| Human | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 (100) | 0 | 1 (100) |
| A. schubertii, human | 1 | 1 (100) | 1 (100) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 (100) | 0 | 0 |
| A. bivalvium, fish | 13 | 5 (38.5) | 13 (100) | 0 | 0 | 4 (30.8) | 0 | 0 | 0 | 0 | 10 (76.9) | 13 (100) | 0 | 8 (61.5) |
| A. enteropelogenes, fish | 6 | 6 (100) | 6 (100) | 0 | 0 | 3 (50) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 (50) |
| A. media, fish | 4 | 0 | 4 (100) | 0 | 0 | 2 (50) | 0 | 0 | 0 | 0 | 2 (50) | 4 (100) | 0 | 0 |
| A. salmonicida, fish | 2 | 2 (100) | 2 (100) | 2 (100) | 0 | 1 (50) | 0 | 0 | 0 | 0 | 2 (100) | 2 (100) | 2 (100) | 2 (100) |
| A. jandaei, fish | 1 | 1 (100) | 1 (100) | 0 | 0 | 0 | 0 | 0 | 1 (100) | 0 | 0 | 0 | 1 (100) | 0 |
| Total | 175 | 145 (82.9) | 154 (88.0) | 51 (29.1) | 10 (5.7) | 87 (49.7) | 11 (6.3) | 14 (8.0) | 16 (9.1) | 13 (7.4) | 130 (74.3) | 129 (73.7) | 42 (24.0) | 84 (48.0) |
a
act, gene encoding a heat-labile cytotoxin; aerA, gene encoding an aerolysin; alt, gene encoding a heat-labile cytotoxin; ascF-ascG, aexT, and ascV, components of the type III secretion system; ela, gene encoding elastase; col, gene encoding collagenase; hlyA, gene encoding hemolysin; lip, gene encoding lipase; *, P < 0.05; **, P < 0.001; ***, P < 0.0001.