Viral infections of colon cancer cell lines. Six colon cancer cell lines: CaCo-2, HT29, LoVo, SW480, SW620 and T84, were infected by either echovirus 12, 15, 17, 26 or 29 in double triplicates. Infections were frozen directly after infection (bound viruses) or incubated until complete CPE was reached, or maximum seven days (viral progeny). All infections were titrated in green monkey kidney cells after having been frozen and thawed three times. Results are presented as mean TCID50/ml values ± standard deviation.