TABLE 4.
Prevalence of CP types 5 and 8 S. aureus over time
| Year | No. (%) of isolates
|
|||
|---|---|---|---|---|
| Total | CP5a | CP8b | NR | |
| 1989-1990 | 69c | 11 (15.9) | 1 (1.5) | 57 (82.6) |
| 1991-1992 | 47 | 3 (6.4) | 7 (14.9) | 37 (78.7) |
| 1993-1994 | 30 | 0 | 5 (16.7) | 25 (83.3) |
| 1995-1996 | 35 | 0 | 0 | 35 (100) |
| 1997 | 14 | 0 | 0 | 14 (100) |
| Total | 195 | 14 | 13 | 168 |
a
The decrease in the prevalence of CP5 isolates from 1989-1990 to 1993-1994 (11/69 to 0/30) was significant (P = 0.014, Fisher's exact test).
b
The increase in the prevalence of CP8 isolates from 1989-1990 to 1991-1992 (1/68 to 7/40) was significant (P = 0.007, Fisher's exact test). Later, the prevalence of CP8 isolates from 1991-1992 to 1995-1996 decreased significantly from 7/40 to 0/35 (P = 0.017, Fisher's exact test).
c
Forty-four isolates from 1989 plus 25 isolates from 1990.