TABLE 2.
Annual distributions of serotypes of L. monocytogenes strains isolated from infections in human subjects
| Sero-type | No. (%) of isolates in the following yr:
|
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 (n = 18) | 1991 (n = 17) | 1992 (n = 16) | 1993 (n = 16) | 1994 (n = 25) | 1995 (n = 20) | 1996 (n = 21) | 1997 (n = 47) | 1998 (n = 43) | 1999 (n = 45) | 2000 (n = 19) | 2001 (n = 27) | Total (n = 314) | |
| 1/2a | 4 (22) | 6 (35) | 8 (50) | 9 (56) | 14 (56) | 12 (60) | 12 (57) | 26 (55) | 19 (44) | 25 (56) | 12 (63) | 18 (67) | 165 (53) |
| 1/2b | 2 (11) | 4 (24) | 1 (6) | 0 (0) | 3 (12) | 2 (10) | 2 (10) | 1 (2) | 0 (0) | 0 (0) | 3 (16) | 0 (0) | 18 (6) |
| 1/2c | 1 (6) | 1 (6) | 0 (0) | 0 (0) | 3 (12) | 1 (5) | 1 (5) | 0 (0) | 0 (0) | 0 (0) | 1 (5) | 2 (7) | 10 (3) |
| 3a | 0 (0) | 1 (6) | 1 (6) | 0 (0) | 1 (4) | 0 (0) | 0 (0) | 4a (9) | 19a (44) | 10a (22) | 0 (0) | 0 (0) | 36 (11) |
| 4b | 11 (61) | 5 (29) | 6 (38) | 7 (44) | 4 (16) | 5 (25) | 6 (29) | 16 (34) | 5 (12) | 10 (22) | 3 (16) | 7 (26) | 85 (27) |
a
At least 25 of 33 isolates (76%) were connected with an outbreak (26).