TABLE 5.
Occurrence of infectious Cryptosporidium oocysts in effluents of water reclamation facilities that provide filtration and combined chlorine disinfection to secondary effluents
| Facility | IFA results
|
Infectious oocysts MPN/ 100 litersd | Species | |||
|---|---|---|---|---|---|---|
| No. of oocysts | % REa | Levelb | Adjusted levelc | |||
| A | 4 | —e | 8 | — | <1.3 | *f |
| 107 | 31 | 209 | 674 | 8 (26) (0.8, 22) | C. parvumg | |
| 5 | 22 | 61 | 277 | <2.5 | * | |
| 5 | — | 11 | — | <1.5 | * | |
| B | 83 | 29 | 162 | 286 | 5 (17) (0.3, 12) | C. parvumh |
| C | 151 | 12 | 319 | 1,258 | 2 (17) (0.4, 8) | C. parvumg |
| 26 | 27 | 55 | 204 | <3.2 | * | |
| D | 3 | 8 | 6 | 75 | <1.8 | * |
| 2 | 5 | 8 | 160 | <2.5 | * | |
| 26 | — | 53 | — | 7 (0.8, 16.9) | C. parvumi | |
| 18 (5.5, 41.4) | C. parvumh | |||||
| 40 | 15 | 120 | 800 | 4 (27) (0.5, 25) | C. parvumi | |
a
Percentage recovery efficiency.
b
Levels of oocysts per 100 liters.
c
Adjusted levels of oocysts based on the recovery efficiency obtained from experiments performed the same day of sample collection.
d
The numbers in boldface correspond to levels of infectious oocysts based on the recovery efficiency. Numbers in parentheses represent the 95% confidence interval.
e
—, not done.
f
*, no amplification.
g
C. parvum human and bovine genotypes.
h
C. parvum human genotype.
i
C. parvum bovine genotype.