Background Nonoxynol 9 is a proved spermicide, but whether itis also a microbicide is uncertain. A truly effective vaginalmicrobicide would reduce the susceptibility of women to sexuallytransmitted diseases, including infection with the human immunodeficiencyvirus (HIV).
Methods We enrolled 1292 HIV-negative female sex workers inCameroon in a double-blind, placebo-controlled study in whichthe participants were randomly assigned to use either a filmcontaining 70 mg of nonoxynol 9 or a placebo film, insertedinto the vagina before intercourse. All of the women were providedwith latex condoms and were instructed to have their male sexualpartners use them. At monthly follow-up visits, we examinedthe women with a colposcope for genital lesions, tested endocervicalspecimens for gonorrhea and chlamydia infection with DNA probes,tested for HIV infection, and treated the women for curablesexually transmitted diseases.
Results The rates of HIV infection (cases per 100 woman-years)were 6.7 in the nonoxynol 9 group and 6.6 in the placebo group(rate ratio, 1.0; 95 percent confidence interval, 0.7 to 1.5).The rates of genital lesions were 42.2 cases per 100 woman-yearsin the nonoxynol 9 group and 33.5 in the placebo group (rateratio, 1.3; 95 percent confidence interval, 1.0 to 1.6). Therates of gonorrhea were 33.3 and 31.1 cases per 100 woman-yearsin the nonoxynol 9 and placebo groups, respectively (rate ratio,1.1; 95 percent confidence interval, 0.8 to 1.4). The correspondingrates of chlamydia infection in the nonoxynol 9 group and theplacebo group were 20.6 and 22.2 cases per 100 woman-years (rateratio, 0.9; 95 percent confidence interval, 0.7 to 1.3). Thewomen reported that condoms were used during 90 percent of sexualacts.
Conclusions The use of a nonoxynol 9 vaginal film did not reducethe rate of new HIV, gonorrhea, or chlamydia infection in thisgroup of sex workers who used condoms and received treatmentfor sexually transmitted diseases.
Source Information
From the Epidemiology Unit (R.E.R., K.A.R., S.S.W.) and the Biostatistics Division (E.L.W.), Family Health International, Durham, N.C.; and the Ministry of Public Health, Yaoundé, Cameroon (L.Z., U.T.).
Address reprint requests to Mr. Roddy at Family Health International, P.O. Box 13950, Durham, NC 27709.
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