Table 1.
Age- and sex-adjusted seroprevalences of markers for HHV–8 infection and surrogate markers for oro-fecal infection (HAV), parenteral infection (HBV and HCV), sexually transmissible infection (HSV-2; Treponema pallidum), in Mapuera Amerindians and non-Amerindian riverside residents of the Trombetas River, Amazon region of Brazil.
| Prevalence, no. (%) of subjects |
|||
|---|---|---|---|
| Serological marker | Amerindians (n = 339) |
Non-Amerindians (n = 181) |
SRa (95% CI) |
| HHV-8 | |||
| LANA | |||
| Negative | 79 (23.3) | 180 (99.4) | |
| Positive | 260 (76.7) | 1 (0.5) | 135.22 (19.1–955.5) |
| Lytic antigen | |||
| Negative | 128 (37.8) | 170 (93.9) | |
| Positive | 211 (62.2) | 11 (6.1) | 9.64 (3.9–23.8) |
| Overall (LANA or lytic antigen) | |||
| Negative | 71 (20.9) | 170 (93.9) | |
| Positive | 268 (79.1) | 11 (6.1) | 12.63 (7.1–22.4) |
| HAV | |||
| Negative | 6 (1.8) | 16 (8.8) | |
| Positive | 333 (98.2) | 165 (91.2) | 1.07 (1.0–1.1) |
| HBV | |||
| Negative | 316 (93.2) | 75 (83.3)b | |
| Positive | 23 (6.8) | 15 (16.7)b | 0.40 (0.2–0.7) |
| HCV | |||
| Negative | 339 (100) | 90 (100)b | |
| Positive | 0 | 0 | NC |
| HSV-2 | |||
| Negative | 314 (92.6) | 117 (64.6) | 0.17 (0.1–0.3) |
| Positive | 25 (7.4) | 64 (35.4) | NC |
| T. pallidum | |||
| Negative | 339 (100) | 171 (94.5) | |
| Positive | 0 | 10 (5.5) | NC |
CI, confidence interval; HAV, hepatitis A virus; HBV, hepatitis B virus; HCV, hepatitis C virus; HHV-8, human herpesvirus type 8; HSV-2, herpes simplex virus type 2; LANA, latency-associated nuclear antigen; NC, not calculated; SR, seroprevalence ratio.
a
Adjusted for age group (≤14 years, 15–24 years, 25–34 years, and ≥35 years) and for sex.
b
Only 90 samples were tested.