Nature 393, 801–805 (1998)

The correct designation of symbols in Figs 1b, d and 3a is as follows. In Fig. 1b, open squares: PABA alone; filled squares: sulphadiazine and PABA; open circles: glyphosate and PABA; filled circles: pyrimethamine and PABA. Figure 1d shows in vivo activity against T. gondii of glyphosate (100 mg kg−1 day−1) and pyrimethamine (12.5 mg kg−1 day−1), alone or in combination. Open squares, with 50% survival at 30 days: combination of glyphosate and pyrimethamine; filled circles: pyrimethamine alone; open circles: glyphosate alone. Open squares, with 0% survival at 9 days: untreated controls. In Fig. 3a, diamonds: PABA alone; squares: folic acid alone; upright triangles: glyphosate and PABA; inverted triangles: glyphosate and folic acid.