Enhanced susceptibility of trypsinized HeLa cells to Chlamydia trachomatis infection.

An improved cell culture method for the recovery of Chlamydia trachomatis from clinical samples was evaluated. Freshly trypsinized HeLa 229 cells were infected in suspension culture and compared to a standard monolayer culture method. Among 1085 specimens evaluated, 84 were positive by both methods, 978 were negative by both methods, 2 were positive by the monolayer method only, and 21 were positive by the suspension method only. Inclusion counts were two-fold higher in the suspension culture method than in the monolayer method (p less than .001). It is concluded that freshly trypsinized HeLa 229 cells infected in suspension culture are more susceptible to infection with Chlamydia trachomatis than standard monolayer cells.