| Oxidative marker | Infection status | Mean ± SEM | t value | P value |
| MDA (µmol/L) | Symptomatic | 0.97 ± 0.02 | 2.741 | 0.001 |
| Asymptomatic | 0.61 ± 0.03 | |||
| GSH (µg/mL) | Symptomatic | 0.06 ± 0.01 | −2.019 | 0.105 |
| Asymptomatic | 0.07 ± 0.01 | |||
| SOD (μmol/mL/min) | Symptomatic | 0.59 ± 0.03 | −1.964 | 0.291 |
| Asymptomatic | 0.70 ± 0.02 | |||
| CAT (μmol/mL/min) | Symptomatic | 1.18 ± 1.02 | −0.593 | 0.249 |
| Asymptomatic | 1.45 ± 0.11 | |||
| Vit C (µg/mL) | Symptomatic | 0.27 ± 0.02 | −4.187 | 0.227 |
| Asymptomatic | 0.38 ± 0.03 | |||
| NO (mmol) | Symptomatic | 0.10 ± 0.01 | 5.931 | 0.000 |
| Asymptomatic | 0.08 ± 0.01 |