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. 2013 Jul 11;13:314. doi: 10.1186/1471-2334-13-314

Table 2.

R5 and X4 tropism at T0 and T1

  R5 T1 (n) X4 T1 (n) Total
R5 T0 (n)
 63
 12
 75
X4 T0 (n)
 8
 26
 34
Total 71 38 109

(Persistence of the tropism: 82% Pearson chi2(1) = 37.6715, P<0.001). Eighty-nine subjects didn’t switch.