Volume 20, Number 3—March 2014
Dispatch
IgG Against Dengue Virus in Healthy Blood Donors, Zanzibar, Tanzania
Francesco Vairo
, Emanuele Nicastri, Salma Masauni Yussuf, Angela Cannas, Silvia Meschi, Mwanakheir AA Mahmoud, Azza H. Mohamed, Paul Mohamed Maiko, Pasquale De Nardo, Nazario Bevilacqua, Concetta Castilletti, Antonino Di Caro, Vincenzo Racalbuto, and Giuseppe Ippolito
, Emanuele Nicastri, Salma Masauni Yussuf, Angela Cannas, Silvia Meschi, Mwanakheir AA Mahmoud, Azza H. Mohamed, Paul Mohamed Maiko, Pasquale De Nardo, Nazario Bevilacqua, Concetta Castilletti, Antonino Di Caro, Vincenzo Racalbuto, and Giuseppe Ippolito
Table 1
Univariate analysis of characteristics of 500 blood donors according to IgG positivity against dengue virus, Zanzibar, 2011*
| Characteristic | IgG positive, n = 253, no. (%) | IgG negative, n = 247, no (%) | Total, N = 500 | OR (95% CI) | p value |
|---|---|---|---|---|---|
| Age, mean (±SD) | 34 (±9) | 30 (±8) | 32 (±9) | <0.001 | |
| Age, for 5-y increase† | 1.32 (1.19–1.47) | <0.001 | |||
| Age, y | |||||
| ≥36 | 57 (39.6) | 87 (60.4) | 144 | 1 | |
| ≤25 | 81 (43.8) | 104 (56.2) | 185 | 1.19 (0.76–1.85) | 0.444 |
| 26–35 |
115 (67.3) |
56 (32.7) |
171 |
3.13 (1.97–4.98) |
<0.001 |
| Sex | |||||
| M | 243 (50) | 243 (50) | 486 | 1 | |
| F |
10 (71.4) |
4 (28.6) |
14 |
2.5 (0.77–8.07) |
0.126 |
| Work | |||||
| Yes | 172 (52.4) | 156 (47.6) | 328 | 1 | |
| No |
80 (47.1) |
90 (52.9) |
170 |
0.8 (0.55-1.16) |
0.254 |
| Persons in household | |||||
| 1-4 | 80 (47.1) | 90 (52.9) | 170 | 1 | |
| 5–8 | 129 (53.8) | 111 (46.2) | 240 | 1.3 (0.88–1.93) | 0.182 |
| >9 |
44 (48.9) |
46 (51.1) |
90 |
1.07 (0.64–1.79) |
0.779 |
| Bed net use | |||||
| Yes | 146 (49.2) | 151 (50.8) | 297 | 1 | |
| No |
107 (52.7 |
96 (47.3) |
203 |
1.15 (0.80–1.64) |
0.436 |
| Insecticide-spraying home | |||||
| Yes | 107 (53.5) | 93 (46.5) | 200 | 1 | |
| No |
146 (48.7) |
154 (51.3) |
300 |
0.82 (0.57–1.17) |
0.290 |
| Flu | |||||
| Yes | 40 (48.8) | 42 (51.2) | 82 | 1 | |
| No |
213 (51) |
205 (49) |
418 |
1.09 (0.67–1.75) |
0.719 |
| Resting water‡ | |||||
| Yes | 223 (50.7) | 217 (49.3) | 440 | 1 | |
| No |
30 (50.8) |
29 (49.2) |
59 |
1.00 (0.58–1.73) |
0.981 |
| Water storage§ | |||||
| Yes | 172 (48.3) | 184 (51.7) | 356 | 1 | |
| No |
82 (56.9) |
62 (43.1) |
144 |
1.39 (0.94–2.06) |
0.093 |
| Area of living | |||||
| Rural | 119 (39.4) | 183 (60.6) | 302 | 1 | |
| Urban | 134 (67.7) | 64 (32.3) | 198 | 3.18 (2.21-4.69) | <0.001 |
*OR, odds ratio.
†Age, 5-y increase is defined as the odds ratio for every 5 years of increase.
‡Resting water is defined as any presence of water resting around the house (i.e.. ponds, puddles).
§Water storage is defined as any container used to collect rain water with no mention of the size and type of container.
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Page updated: February 19, 2014
Page reviewed: February 19, 2014
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