Thermostability (T90) and half-life of infectivity decay at 37°C (t1/2) of select HIV-1 (PSVs) from clades A, B and C.

1Infectivities were determined in TZM-bl cells and the resulting relative light units (RLUs) were categorized as follows: +/−, 100,000–149,999; +, 150,000–349,999; ++, 350,000–999,999; +++, ≥1,000,000.2T90, the temperature at which HIV-1 infectivity decreases by 90% in 1 h, and the standard error of the mean (SEM) of at least three independent experiments.3t1/2, the time (in hours) at which HIV-1 infectivity decreases by 50% under physiological conditions (37°C), and the standard error of the mean (SEM) of at least three independent experiments.