Volume 16, Number 5—May 2010
Letter
Serologic Survey of Hantavirus Infection, Brazilian Amazon
Wellington S. Mendes1, Antônio A.M. da Silva, Romerito F. Neiva, Nicolle M. Costa, Maressa S. de Assis, Priscila M.O. Vidigal, Maria da G. L. Leite, Elizabeth S.T. da Rosa, Daniele B. de A. Medeiros, Darlene de B. Simith, and Pedro F. da C. Vasconcelos
Table
Univariate analysis of risk factors associated with hantavirus infection in humans, Maranhão western lowlands, Brazil, 2006*
| Possible risk factor | SNV IgG positive, no. (%), n = 65 | SNV IgG negative, no. (%), n = 1,324 | OR (95% CI) | p value |
|---|---|---|---|---|
| Storing grain in the house | 38 (58.5) | 774 (58.5) | 1.00 (0.60–1.66) | 0.999 |
| Sweeping the house | 53 (81.5) | 1176 (88.8) | 0.56 (0.29–1.06) | 0.076 |
| Seeing rats in the dwelling | 47 (72.3) | 742 (56.0) | 2.05 (1.18–3.56) | 0.011 |
| Seeing rats in the fields | 41 (63.1) | 618 (46.7) | 1.95 (1.17–3.27) | 0.011 |
| Having killed rats in the dwelling | 46 (70.8) | 686 (51.8) | 2.25 (1.31–3.88) | 0.004 |
| Having killed rats in the fields | 29 (44.6) | 308 (23.3) | 2.66 (1.60–4.40) | <0.001 |
| Being bitten by a rat | 5 (7.7) | 46 (3.5) | 2.32 (0.89–6.04) | 0.086 |
| Seeing rat feces in the dwelling | 34 (52.3) | 609 (46.0) | 1.29 (0.78–2.12) | 0.320 |
| Being a farmer | 40 (61.5) | 467 (35.3) | 2.94 (1.76–4.90) | <0.001 |
| Using rat meat as fishing bait | 1 (1.5) | 13 (1.0) | 1.58 (0.20–12.2) | 0.664 |
| Seeing buffaloes in the fields | 26 (40.0) | 518 (39.1) | 1.04 (0.62–1.72) | 0.888 |
| Keeping a snake in the house | 0 | 27 (2.0) | Not calculated | 0.245 |
| Keeping a cat in the house | 33 (50.8) | 689 (52.0) | 0.95 (0.58–1.56) | 0.841 |
| Keeping a dog in the house | 39 (60.0) | 890 (67.2) | 0.73 (0.44–1.22) | 0.229 |
| Living in a dwelling close to the fields | 47 (72.3) | 868 (65.6) | 1.37 (0.79–2.39) | 0.264 |
| Living near fruit trees | 40 (61.5) | 829 (62.6) | 0.96 (0.57–1.59) | 0.861 |
| Living near the forest | 29 (44.6) | 599 (45.2) | 0.98 (0.59–1.61) | 0.921 |
| Living in a house >30 m from the fields | 23 (35.4) | 477 (36.0) | 0.97 (0.68–1.64) | 0.916 |
| Bathing in flooded fields | 27 (41.5) | 429 (32.4) | 1.48 (0.89–2.46) | 0.128 |
| Fishing in flooded fields | 43 (66.2) | 797 (60.2) | 1.29 (0.76–2.19) | 0.339 |
| Being age 20–29 y | 12 (18.5) | 266 (20.1) | 7.31 (2.04–26.1) | 0.002 |
| Being age 30–39 y | 8 (12.3) | 226 (17.1) | 5.73 (1.51–21.8) | 0.010 |
| Being age >40 y | 42 (64.6) | 346 (26.1) | 19.7 (6.05–64.0) | <0.001 |
| Being male | 38 (58.5) | 590 (44.6) | 1.75 (1.06–2.90) | 0.030 |
*SNV, Sin Nombre virus; Ig, immunoglobulin; OR, odds ratio; CI, confidence interval.
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