FIG. 5.

Proliferation of pleural exudate cells in tuberculous pleurisy. Pleuritic guinea pigs were euthanized on days 1 to 9, and cells were removed from the pleural cavity. Cells were cultured for 96 h in the presence of ConA (10 μg/ml) or PPD (12.5 or 25 μg/ml). Proliferative responses are reported as stimulation indices (counts per minute of stimulated cells divided by counts per minute of unstimulated cells). Data and error bars represent the mean of three or four animals ± the standard error of the mean. An asterisk indicates a significant increase in proliferation compared to similarly stimulated cells on day 1.