TABLE 1.
PRNT interpretations for serum specimens with positive ZIKAV IgM results in U.S. states and three territories from 1 January 2016 to 31 August 2016 (n = 1,037)
| PRNT interpretationa | U.S. states (n = 759) |
USVI (n = 52) |
American Samoa (n = 103) |
Puerto Rico (n = 123) |
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|---|---|---|---|---|---|---|---|---|
| No. | % (95% CI) | No. | % (95% CI) | No. | % (95% CI) | No. | % (95% CI) | |
| ZIKAV infection | 208 | 27 (21–34) | 11 | 21 (0–48) | 15 | 15 (0–34) | 13 | 11 (0–28) |
| Unspecified flavivirus infection | 344 | 45 (39–52) | 32 | 62 (40–83) | 86 | 83 (73–94) | 103 | 84 (74–93) |
| DENV infectiona | 59 | 8 (1–15) | 4 | 8 (0–35) | 1 | 1 (0–20) | 7 | 6 (0–23) |
| Negativea,b | 148 | 19 (13–26) | 5 | 10 (0–37) | 1 | 1 (0–20) | 0 | 0 (−18–18) |
a
PRNT interpretations of DENV infection or negative were considered ZIKAV false-positive IgM.
b
No evidence of ZIKAV or DENV infection.