Women and HIV.
The number of women with HIV HIV (Human Immunodeficiency Virus), either of two closely related retroviruses that invade T-helper lymphocytes and are responsible for AIDS. There are two types of HIV: HIV-1 and HIV-2. HIV-1 is responsible for the vast majority of AIDS in the United States. and AIDS in the United States is steadily rising. From 1985 to 1996, the proportion of reported U.S. AIDS cases occurring among women increased from 7 percent to 20 percent. HIV infection is now the third leading cause of death among women ages 25 to 44 and the leading cause of death among black women in this age group.
In addition to conditions such as Pneumocystis carinii pneumonia Pneumocystis carinii pneumonia (PCP)
A lung infection that affects people with weakened immune systems, such as people with AIDS or people taking medicines that weaken the immune system.
Mentioned in: AIDS, Antiprotozoal Drugs, Sulfonamides that afflict HIV-infected people of both genders, women suffer gender-specific manifestations of HIV disease, such as recurrent vaginal yeast infections and pelvic inflammatory disease pelvic inflammatory disease (PID), infection of the female reproductive organs, usually resulting from infection with the bacteria that cause chlamydia or gonorrhea. .
Women with HIV frequently have great difficulty accessing health care, and carry a large burden of caring for children and other family members who may also be HIV-infected. They often lack social support and face other challenges that may interfere with their ability to adhere to treatment regimens.
To confront the growing problem of HIV and AIDS in women, the National Institute of Allergy and Infectious Diseases (NIAID NIAID National Institute of Allergy and Infectious Diseases. ) has made woman-focused research an important component of the Institute's AIDS research program.
NIAID supports studies in the United States and abroad of the natural history and manifestations of HIV infection in both non-pregnant and pregnant women, as well as the factors that influence the transmission of HIV to women. Investigators are studying the unique features of HIV/AIDS HIV/AIDS Human Immunodeficiency Virus/Acquired Immune Deficiency Syndrome in women and developing new treatment regimens for women with these conditions.
Scientists also are developing and testing new methods to prevent women from becoming infected with HIV. These include creams or gels that women would apply before intercourse to protect themselves from HIV as well as other sexually transmitted organisms. A recent study supported by NIAID found that one vaginal contraceptive film, N-9, did not offer women any protection against HIV, gonorrhea or chlamydia. Other studies will be conducted as part of NIAID's overall HIV/STD prevention program.
In addition, researchers are studying the mechanisms of mother-to-child HIV transmission and are devising interventions to reduce such transmission. Notably, NIAID-funded investigators have shown that a specific regimen of zidovudine zidovudine /zi·do·vu·dine/ (zi-do´vu-den) a synthetic nucleoside (thymidine) analogue that inhibits replication of some retroviruses, including the human immunodeficiency virus; used in the treatment of HIV infection and AIDS. (AZT AZT or zidovudine (zīdō`vydēn'), drug used to treat patients infected with the human immunodeficiency virus (HIV), which causes AIDS; also called ), given to an HIV-infected woman during pregnancy and to her baby after birth, can reduce mother-to-infant HIV transmission by two-thirds. Researchers now are assessing other antiretroviral regimens that may prove even more effective, as well as simpler and less costly regimens that may have broader applications.
Scope of the Problem
An analysis from the National Cancer Institute estimates that between 107,000 and 150,000 women in the United States are living with HIV infection (many of whom have not developed AIDS).
As of Dec. 30, 1996, the Centers for Disease Control and Prevention Centers for Disease Control and Prevention (CDC), agency of the U.S. Public Health Service since 1973, with headquarters in Atlanta; it was established in 1946 as the Communicable Disease Center. (CDC See Control Data, century date change and Back Orifice.
CDC - Control Data Corporation ) had received reports of 85,500 cases of AIDS among female adults and adolescents in the United States, 48,186 of whom have died. Minority women in the United States are disproportionately affected by AIDS: in 1996, 56 percent of reported female U.S. AIDS cases were among black women, and 20 percent among Hispanic women. These women tend to be poor, young and residents of disenfranchised communities in inner-city neighborhoods.
Approximately 42 percent of the 21 million adults living with HIV/AIDS worldwide are women, according to the World Health Organization (WHO).
Transmission of HIV to Women
In the United States, most HIV-infected women are exposed to the virus during sex with an HIV-infected man or while using HIV-contaminated syringes for the injection of drugs such as heroin, cocaine and amphetamines Amphetamines
Sympathomimetic amines; sometimes called speed; synthetic chemicals that stimulate the central nervous system.
Mentioned in: Weight Loss Drugs
Of U.S. AIDS cases among women reported in 1996, 40 percent were attributed to heterosexual contact and 34 percent to injection drug use; most of the other cases reported in 1996 were attributed to "no known exposure." In recent years, the majority of such unclassified cases upon further investigation have been reclassified as cases attributable to heterosexual exposure.
Worldwide, the WHO estimates that about 75 percent of adult HIV infections are due to heterosexual transmission of the virus through sexual intercourse.
During unprotected heterosexual intercourse with an HIV-infected partner, women in general appear to be more easily infected with the virus than do men. Studies in the United States and abroad have demonstrated that other sexually transmitted diseases Sexually transmitted diseases
Infections that are acquired and transmitted by sexual contact. Although virtually any infection may be transmitted during intimate contact, the term sexually transmitted disease is restricted to conditions that are largely (STDs), particularly infections that cause ulcerations Ulcerations
Breaks in skin or mucous membranes that are often accompanied by loss of tissue on the surface.
Mentioned in: Hypersplenism of the mucosal surfaces (e.g., syphilis and chancroid chancroid: see sexually transmitted disease. ), greatly increase a woman's risk of becoming infected with HIV. Anal sex also increases a woman's risk of becoming HIV-infected.
NIAID-sponsored cohort studies in the United States have found a number of other factors to be associated with an increased risk of heterosexual HIV transmission including alcohol use, history of childhood sexual abuse, current domestic abuse and use of crack/cocaine.
The consistent use of condoms greatly reduces the risk of becoming infected with HIV. In studies of discordant heterosexual couples (one individual HIV-positive, the other HIV-negative) who report regular condom use, HIV transmission rates have been extremely low.
Signs and Symptoms of HIV
Many manifestations of HIV disease are similar in men and women. Both men and women with HIV may have nonspecific nonspecific /non·spe·cif·ic/ (non?spi-sif´ik)
1. not due to any single known cause.
2. not directed against a particular agent, but rather having a general effect.
1. symptoms even early in disease, including low-grade fevers, night sweats, fatigue and weight loss. In the United States, the most common AIDS-associated condition in both women and men is a lung infection called Pneumocystis carinii pneumonia (PCP PCP
2. primary care physician
Pneumocystis carinii pneumonia (PCP) ). Anti-HIV therapies, as well as treatments for the infections associated with HIV (so-called opportunistic infections), appear to be similarly effective in men and women.
Other conditions occur in different frequencies in men and women. HIV-infected men, for instance, are eight times more likely than HIV-infected women to develop a skin cancer known as Kaposi's sarcoma. In some studies, women have had higher rates of esophageal candidiasis (yeast infections of the windpipe windpipe: see trachea. ) and herpes simplex infections than men.
Data from a study conducted by NIAID's Terry Beirn Community Programs for Clinical Research on AIDS CPCRA, the Community Programs for Clinical Research on AIDS, is - according to their own website:
"an experienced community-based clinical trials network whose main goal is to obtain evidence to properly inform healthcare providers and people living with HIV on the most (CPCRA CPCRA Community Programs for Clinical Research on AIDS ) found that HIV-infected women were more likely than HIV-infected men to develop bacterial pneumonia. This finding may be explained by factors such as a delay in care-seeking among HIV-infected women as compared to men, and/or less access to anti-HIV therapies or preventive therapies for PCP.
Woman-Specific Symptoms of HIV Infection
Women also experience HIV-associated gynecologic gynecologic /gy·ne·co·log·ic/ (gi?ne-) (jin?e-kah-loj´ik) pertaining to the female reproductive tract or to gynecology. problems, many of which also occur in uninfected women but with less frequency or severity.
Vaginal yeast infections, common and easily treated in most women, often are particularly persistent and difficult to treat in HIV-infected women. Data from the NIAID-supported Women's Interagency Health Study (WIHS WIHS AIDS A clinical trial–Women's Interagency HIV Study ) suggest that these infections are considerably more frequent in HIV-infected women.
A drug called fluconazole fluconazole /flu·con·a·zole/ (floo-kon´ah-zol) a triazoleantifungal used in the systemic treatment of candidiasis and cryptococcal meningitis.
n. is commonly used to treat yeast infections. A CPCRA study demonstrated that weekly doses of fluconazole can also safely prevent vaginal and esophageal candidiasis, without resulting in resistance to the drug.
Other vaginal infections may occur more frequently and with greater severity in HIV-infected women, including bacterial vaginosis and common STDs such as gonorrhea, chlamydia and trichomoniasis trichomoniasis (trĭk'əmənī`əsĭs), sexually transmitted disease caused by the parasitic protozoan Trichomonas vaginalis. .
Severe herpes simplex virus Herpes simplex virus
A virus that can cause fever and blistering on the skin, mucous membranes, or genitalia.
Mentioned in: Conjunctivitis
herpes simplex virus ulcerations, sometimes unresponsive to therapy with the standard drug, acyclovir acyclovir /acy·clo·vir/ (a-si´klo-ver) a synthetic purine nucleoside with selective activity against herpes simplex virus; used as the base or the sodium salt in the treatment of genital and mucocutaneous herpesvirus infections. , can severely compromise a woman's quality of life.
Idiopathic genital ulcers -- those with no evidence of an infectious organism or cancerous cells in the lesion -- are a unique manifestation of HIV disease. These ulcers, for which there is no proven treatment, are sometimes confused with those caused by herpes simplex virus.
NIAID is currently assessing, in a study known as AIDS Clinical Trials Group The AIDS Clinical Trials Group (ACTG) is the largest HIV clinical trials organization in the world, playing a major role in setting standards of care for HIV infection and opportunistic diseases related to HIV and AIDS in the United States and the developed world. (ACTG ACTG Acting
ACTG AIDS Clinical Trial Group
ACTG Actuating/Actuator ) 842, the prevalence of idiopathic genital ulcer disease in HIV-infected women and the effect of thalidomide thalidomide (thəlĭd`əmĭd'), sleep-inducing drug found to produce skeletal defects in developing fetuses. The drug was marketed in Europe, especially in West Germany and Britain, from 1957 to 1961, and was thought to be so safe that treatment. Thalidomide has previously proven effective in the treatment of oral aphthous ulcers in HIV-infected people.
Human papillomavirus (HPV HPV human papillomavirus.
human papilloma virus
Human papilloma virus (HPV) )infections, which cause genital warts and can lead to cervical cancer, occur with increased frequency in HIV-infected women. A precancerous condition associated with HPV called cervical intraepithelial neoplasia cervical in·tra·ep·i·the·li·al neoplasia
Dysplastic changes beginning at the squamocolumnar junction in the uterine cervix that may be precursor to squamous cell carcinoma. (CIN CIN cervical intraepithelial neoplasia.
Cervical intraepithelial neoplasia (CIN)
A term used to categorize degrees of dysplasia arising in the epithelium, or outer layer, of the cervix. ) also is more common and more severe in HIV-infected women, and more apt to recur after treatment.
Three studies within NIAID's ACTG address CIN in HIV-infected women. A study known as ACTG 200 is assessing topical vaginal 5-fluorouracil maintenance therapy to prevent the recurrence of moderate-to-severe cervical dysplasia. ACTG 293 is evaluating oral isotreninoin for prevention of progression of low-grade (mild) dysplasia to high-grade dysplasia or invasive cancer of the cervix in HIV-positive women. ACTG 866 is assessing the effect of the protease inhibitor indinavir indinavir /in·di·na·vir/ (in-di´nah-vir) an HIV protease inhibitor that causes formation of immature, noninfectious viral particles; used as the sulfate salt in the treatment of HIV infection and AIDS. on the progression of cervical dysplasia and HPV infections in HIV-infected women, and on the amount of HIV in vaginal secretions.
Pelvic inflammatory disease (PID (1) (Process IDentifier) A temporary number assigned by the operating system to a process or service.
(2) (Proportional-Integral-Derivative) The most common control methodology in process control. ) appears to be more common and more aggressive in HIV-infected women than in uninfected women. PID may become a chronic and relapsing condition as a woman's immune system deteriorates.
Menstrual irregularities frequently are reported by HIV-infected women and are being actively studied by NIAID-supported scientists. Although menstrual irregularities were equally common in HIV-infected women and at-risk HIV-negative women in a recent WIHS survey, women with CD4+ T cell counts below 50 per cubic millimeter ([mm.sup.3]) of blood were more likely to report amenorrhea amenorrhea (āmĕn'ərē`a, əmĕn'–), cessation of menstruation. Primary amenorrhea is a delay in or a failure to start menstruation; secondary amenorrhea is an unexpected stop to the menstrual cycle. (no menses menses /men·ses/ (men´sez) the monthly flow of blood from the female genital tract.
n. within the last three months) than uninfected women, or HIV-infected women with higher CD4+ T cell counts.
Because megace, an FDA-approved drug often prescribed for HIV-associated wasting, can cause significant, irregular vaginal bleeding in HIV-infected women, NIAID is planning a trial to assess an alternate drug, nandrolone nandrolone /nan·dro·lone/ (nan´dro-lon) an anabolic steroid with lesser androgenic effects; used as n. decanoate and n. , in women with HIV-associated weight loss.
The Public Health Service currently recommends that HIV-positive women have a complete gynecologic evaluation, including a Pap smear, as part of their initial HIV evaluation, or upon entry to prenatal care, and another Pap smear six months later. If both smears are negative, annual screening is recommended thereafter in asymptomatic women. However, more frequent screening -- every six months -- is recommended for women with symptomatic HIV infection, prior abnormal Pap smears, or signs of human papillomavirus infection.
Early Diagnosis Important
Some women in the United States have poor access to health care. In addition, women may not perceive themselves to be at risk for HIV infection. Because of these reasons and other psychosocial factors, symptoms that could serve as warning signals of HIV infection -- such as recurrent yeast infections -- may go unheeded. PID, CIN and the other symptoms discussed above should signal caregivers to offer women HIV testing accompanied by counseling.
Early diagnosis of HIV infection allows women to take full advantage of antiretroviral therapies and preventive drugs for opportunistic infections, both of which can forestall the development of AIDS-related symptoms and prolong life in HIV-infected men and women. Early diagnosis also allows women to make informed reproductive choices. Health care workers should be alert to early signs of HIV infection in women, and all women should consider HIV testing if they have engaged in high-risk activities.
Survival Among HIV-Infected Women
Women whose HIV infections are detected early and who receive appropriate treatment survive as long as infected men. However, because women may be less likely than men to receive an early diagnosis and treatment, survival times for women as compared to men have been shorter in several studies.
In a CPCRA study of more than 4,500 people with HIV, HIV-infected women were one-third more likely than HIV-infected men to die within the study period. The CPCRA investigators could not definitively identify the reasons for excess mortality among women in this study, but they speculated that poorer access to or use of health care resources among HIV-infected women as compared to men, domestic violence, homelessness and lack of social supports for women may have been important factors.
Perinatal Transmission of HIV
In the United States, approximately 25 percent of pregnant HIV-infected women not receiving AZT therapy have passed on the virus to their babies.
Most perinatal transmission, an estimated 50 to 80 percent of infections, probably occurs late in pregnancy or during birth. Although the precise mechanisms are unknown, scientists think HIV may be transmitted when maternal blood enters the fetal circulation, or by mucosal exposure to virus during labor and delivery. The role of the placenta in maternal-fetal transmission is unclear and the focus of considerable research.
The risk of perinatal transmission is significantly increased if the mother has advanced HIV disease, large amounts of HIV in her bloodstream, or few of the immune system cells -- CD4+ T cells -- that are the main targets of HIV.
Other factors that may increase the risk of perinatal transmission are maternal drug use, severe inflammation of fetal membranes, or a prolonged period between membrane rupture and delivery. A recent study sponsored in part by NIAID found that HIV-infected women who gave birth more than four hours after the rupture of the fetal membranes were nearly twice as likely to transmit HIV to their infants, as compared to women who delivered within four hours of membrane rupture. In the same study, HIV-infected women who used heroin or crack/cocaine during pregnancy were also twice as likely to transmit HIV to their offspring as HIV-infected women who did not use drugs.
HIV also may be transmitted from a nursing mother to her infant. A recent analysis suggested that breast-feeding breast-feeding /breast-feed·ing/ (brest´fed?ing) nursing; the feeding of an infant at the mother's breast. introduces an additional risk of HIV transmission of approximately 14 percent. However, the WHO still recommends breast-feeding of infants in developing countries because the benefits are believed to far outweigh the potential risk of HIV transmission.
A role for AZT. A study conducted by NIAID's Pediatric AIDS Clinical Trials Group demonstrated that AZT, given to HIV-infected pregnant women who had very little or no prior antiretroviral therapy and CD4+ T cell counts above 200/[mm.sup.3], reduced the risk of maternal-infant transmission by two-thirds.
In the study, known as ACTG 076, AZT therapy was initiated in the second or third trimester and continued during labor, and infants were treated for six weeks following birth. AZT produced no serious side effects in mothers or infants; long-term follow-up of the infants and mothers is ongoing.
Researchers have subsequently shown that this AZT regimen has reduced perinatal transmission in other populations in which AZT has been used. However, the AZT regimen used in ACTG 076 is not always available because of cost and logistical demands. Therefore, NIAID also is pursuing a global strategy that includes the examination of simpler and less costly regimens for preventing mother-to-infant transmission of HIV.
Because a significant amount of perinatal HIV transmission occurs around the time of birth, and the risk of maternal-fetal transmission depends, in part, on the amount of HIV in the mother's blood, it may be possible to reduce transmission using drug therapy only around the time of birth.
NIAID-supported researchers are studying the effect of this approach and also whether immunoglobulin preparations containing large quantities of antibodies to HIV can prevent perinatal HIV transmission when given to the mother and/or the neonate neonate /neo·nate/ (ne´o-nat) newborn infant.
A neonatal infant.
a newborn animal. . This strategy -- known as passive immunization -- has been used successfully in reducing perinatal transmission of hepatitis B virus.
For More Information About Treatment and Clinical Trials
NIAID provides major support for the AIDS Clinical Trials Information Service, at 1-800-TRIALS-A, to advise callers of the status of HIV clinical trials being conducted throughout the United States. The AIDS Treatment Information Service at 1-800-HIV-0440 provides information about federally approved treatment guidelines. Both services operate from 9 a.m. to 7 p.m. Eastern Time, Monday through Friday. English-and Spanish-speaking specialists are available.
The NIAID HIV/AIDS Research Agenda and fact sheets on NIAID HIV/AIDS vaccine research, clinical trials for AIDS therapies and vaccines, and on AIDS-related opportunistic infections are available from the NIAID Office of Communications. To receive free copies, call (301) 496-5717, Monday through Friday, 8:30 a.m. to 5:00 p.m. Eastern Time.
NIAID, a component of the National Institutes of Health, supports research on AIDS, tuberculosis and other infectious diseases as well as allergies and immunology.
Prepared by: Office of Communications National Institute of Allergy and Infectious Diseases National Institutes of Health Bethesda, MD 20892
Public Health Service U.S. Department of Health and Human Services Noun 1. Department of Health and Human Services - the United States federal department that administers all federal programs dealing with health and welfare; created in 1979
Health and Human Services, HHS April 1997