SUMMARY In an observer blind comparative study, 130 men with penile warts were randomly allocated to treatment with either cryotherapy or trichloroacetic acid (TCAA). There was no significant difference in response to treatment, side effects, or recurrence rates between the two treatments. Warts resolved in 81% of patients treated with TCAA compared with 88% of those treated with cryotherapy. Early recurrence occurred in 36% of patients treated with TCAA and in 39% of those treated with cryotherapy.

Letters should not exceed 400 words and should be typed double spaced (including the references) and be signed by all authors TO THE EDITOR, Genitourinary Medicine Fewer Trichomonas vaginalis organisms in vaginas of infected women during menstruation Sir, A recent paper by Demes et al reports lower counts of Trichomonas vaginalis organisms in the vagina during menstruation.' The authors considered that this was caused by immunological factors within menstrual blood. Other explanations for this result could also be given. The menstrual flow may "flush out" the vagina and thus decrease the number of organisms present. No mention was made of the use of tampons, which absorb vaginal secretions and organisms. Constituents of tampons may alter vaginal microbiology. Finally, the raised vaginal pH during menstruation may also be a factor. Yours faithfully,