Correspondence.

Presents letters to the editor, published in the November 2001 issue of the journal 'Environmental Health Perspectives,' on issues dealing with health. Confirmation of uterotrophic activity for 4-methylbenzylidine camphor in the immature rat; Impact of repeated exposure to fungi in a water-damaged building on the health of workers; Need of further research on markers of exposure to bioaerosols in case of patients with microbial exposure-related lung damage.