Table 7: The effects of the tested treatments on dust removal from the lungs of silica-exposed rats.

TreatmentWhole lung free silica content (mg)Free silica removed from the lung (mg)Free silica clearance rate for the whole lung (%)Silica discharge rate for the whole lung (mg/d)

Negative control
Chinese herbal kombucha

Positive control

—: because the rats in the negative control group were not exposed to silica, the analysis was not performed in this case.
*Value differs significantly from that for the tetrandrine treatment group ( ).