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. 2004 Feb;10(2):311–316. doi: 10.3201/eid1002.030799

Table. Summary of clinical samplesa.

Specimens Total patients 1–10 d
 11–20 d
 21–30 d
 31–40 d
 >40 d
pos neg pos neg pos neg pos neg pos neg
Feces PCR
 326
 10
 27
 19
 52
 12
 65
 12
 55
 7
 67
Blood PCR
 426
 28
 34
 20
 21
 22
 143
 26
 132
 NA
 NA
Blood IgG
 426
 6
 56
 10
 31
 82
 83
 138
 20
 NA
 NA
Blood IgM 426 8 54 6 35 63 102 82 76 NA NA

apos, positive;eg, negative; PCR, polymerase chain reaction; Ig, immunoglobulin; NA, not available.