Table 1. Bayesian MCMC test of phylogenetic isolation of Brazilian HIV-1 subtype C sequences by geographic region.
| Geographic regions | Statistic | Observed value (95% CI) | Expected valuea (95% CI) | P-value |
| PA-FL | AI | 2.98 (2.23–3.73) | 5.04 (4.12–5.98) | <0.001 |
| PS | 18.85 (16.00–21.00) | 30.61 (27.48–33.35) | <0.001 | |
| PA-CU | AI | 1.79 (1.14–2.48) | 4.83 (3.91–5.64) | <0.001 |
| PS | 11.98 (9.0–15.0) | 29.89 (26.88–32.41) | <0.001 | |
| FL-CU | AI | 2.96 (2.18–3.77) | 4.58 (3.60–5.49) | <0.001 |
| PS | 21.39 (19.00–24.00) | 26.74 (24.24–29.40) | <0.001 |
a
Expected AI or PS value under the null hypothesis of no phylogenetic clustering of isolates by sampling location. PA: Porto Alegre. FL: Florianópolis. CU: Curitiba.