Individual and poly-substance use and condomless sex among HIV-uninfected adults reporting heterosexual sex in a multi-site cohort.

BACKGROUND: We analyzed the association between substance use (SU) and condomless sex (CS) among HIV-negative adults reporting heterosexual sex in the Seek, Test, Treat, and Retain (STTR) consortium. We describe the impact of SU as well as person/partner and context-related factors on CS, identifying combinations of factors that indicate the highest likelihood of CS. METHODS: We analyzed data from four US-based STTR studies to examine the effect of SU on CS using two SU exposures: 1) recent SU (within 3 months) and 2) SU before/during sex. Behavioral data were collected via 1:1 or self-administered computerized interviews. Adjusted individual-study, multivariable relative risk regression was used to examine the relationship between CS and SU. We also examined interactions with type of sex and partner HIV status. Pooled effect estimates were calculated using traditional fixed-effects meta-analysis. We analyzed data for recent SU (n = 6781; 82% men, median age = 33 years) and SU before/during sex (n = 2915; 69% men, median age = 40 years). RESULTS: For both exposure classifications, any SU other than cannabis increased the likelihood of CS relative to non-SU (8-16%, p-values< 0.001). In the recent SU group, however, polysubstance use did not increase the likelihood of CS compared to single-substance use. Cannabis use did not increase the likelihood of CS, regardless of frequency of use. Type of sex was associated with CS; those reporting vaginal and anal sex had a higher likelihood of CS compared to vaginal sex only for both exposure classifications (18-21%, p < 0.001). Recent SU increased likelihood of CS among those reporting vaginal sex only (9-10%, p < 0.001); results were similar for those reporting vaginal and anal sex (5-8%, p < 0.01). SU before/during sex increased the likelihood of CS among those reporting vaginal sex only (20%; p < 0.001) and among those reporting vaginal and anal sex (7%; p = 0.002). Single- and poly-SU before/during sex increased the likelihood of CS for those with exclusively HIV-negative partners (7-8%, p ≤ 0.02), and for those reporting HIV-negative and HIV-status unknown partners (9-13%, p ≤ 0.03). CONCLUSION: Except for cannabis, any SU increased the likelihood of CS. CS was associated with having perceived HIV-negative partners and with having had both anal/vaginal sex.

The Mortality After Release from Incarceration Consortium (MARIC): Protocol for a multi-national, individual participant data meta-analysis.

INTRODUCTION: More than 30 million adults are released from incarceration globally each year. Many experience complex physical and mental health problems, and are at markedly increased risk of preventable mortality. Despite this, evidence regarding the global epidemiology of mortality following release from incarceration is insufficient to inform the development of targeted, evidence-based responses. Many previous studies have suffered from inadequate power and poor precision, and even large studies have limited capacity to disaggregate data by specific causes of death, sub-populations or time since release to answer questions of clinical and public health relevance. OBJECTIVES: To comprehensively document the incidence, timing, causes and risk factors for mortality in adults released from prison. METHODS: We created the Mortality After Release from Incarceration Consortium (MARIC), a multi-disciplinary collaboration representing 29 cohorts of adults who have experienced incarceration from 11 countries. Findings across cohorts will be analysed using a two-step, individual participant data meta-analysis methodology. RESULTS: The combined sample includes 1,337,993 individuals (89% male), with 75,795 deaths recorded over 9,191,393 person-years of follow-up. CONCLUSIONS: The consortium represents an important advancement in the field, bringing international attention to this problem. It will provide internationally relevant evidence to guide policymakers and clinicians in reducing preventable deaths in this marginalized population. KEY WORDS: Mortality; incarceration; prison; release; individual participant data meta-analysis; consortium; cohort.

Advancing Behavioral HIV Prevention: Adapting an Evidence-Based Intervention for People Living with HIV and Alcohol Use Disorders.

Alcohol use disorders (AUDs) are highly prevalent among people living with HIV/AIDS (PLWHA) and are associated with increased HIV risk behaviors, suboptimal treatment adherence, and greater risk for disease progression. We used the ADAPT-ITT strategy to adapt an evidence-based intervention (EBI), the Holistic Health Recovery Program (HHRP+), that focuses on secondary HIV prevention and antiretroviral therapy (ART) adherence and apply it to PLWHA with problematic drinking. Focus groups (FGs) were conducted with PLWHA who consume alcohol and with treatment providers at the largest HIV primary care clinic in New Orleans, LA. Overall themes that emerged from the FGs included the following: (1) negative mood states contribute to heavy alcohol consumption in PLWHA; (2) high levels of psychosocial stress, paired with few adaptive coping strategies, perpetuate the use of harmful alcohol consumption in PLWHA; (3) local cultural norms are related to the permissiveness and pervasiveness of drinking and contribute to heavy alcohol use; (4) healthcare providers unanimously stated that outpatient options for AUD intervention are scarce, (5) misperceptions about the relationships between alcohol and HIV are common; (6) PLWHA are interested in learning about alcohol's impact on ART and HIV disease progression. These data were used to design the adapted EBI.

Prevalence of tuberculosis symptoms and latent tuberculous infection among prisoners in northeastern Malaysia.

SETTING: There are currently no routine screening procedures for active tuberculosis (TB) or latent tuberculous infection (LTBI) in Malaysian prisons. OBJECTIVE: To determine the prevalence and correlates of LTBI and active TB symptoms among Malaysian prisoners with and without human immunodeficiency virus (HIV) infection using the tuberculin skin test (TST) and the World Health Organization TB symptom-based screening instrument. DESIGN: A cross-sectional survey of 266 prisoners was performed in Kelantan, Malaysia. Consenting participants underwent two-step TST and were screened for active TB symptoms. Standardized cut-offs of respectively ≥5 and ≥10 mm were used to define reactive TST among prisoners with and without HIV. Clinical and behavioral data were assessed and HIV-infected prisoners were stratified by CD4 status. RESULTS: Overall LTBI prevalence was 87.6%, with significantly lower TST reactivity among HIV-infected than non-HIV-infected prisoners (83.6% vs. 91.5%, P < 0.05); however, TB symptoms were similar (16.9% vs. 10.1%, P = 0.105). On multivariate analysis, previous incarceration (aOR 4.61, 95%CI 1.76-12.1) was the only significant correlate of LTBI. Increasing age (aOR 1.07, 95%CI 1.01-1.13), lower body mass index (aOR 0.82, 95%CI 0.70-0.96) and TST-reactive status (aOR 3.46, 95%CI 1.20-9.97) were correlated with TB symptoms. CONCLUSION: LTBI is highly prevalent, associated with previous incarceration, and suggests the need for routine TB screening on entry to Malaysian prisons.

Treatment outcome, mortality and their predictors among HIV-associated tuberculosis patients.

The risk of death is significantly higher in HIV-infected patients with tuberculosis (TB). This study aims to evaluate the impact of demographic, clinical and laboratory characteristics on the treatment outcome and mortality of TB/HIV co-infected patients in a tertiary TB centre in Iran. In total, 111 patients were recruited from 2004 to 2007. Mycobacteriological studies and demographic, clinical, and laboratory data from all patients were analysed and predictors of unsuccessful outcomes as well as mortality were determined. The mean age for all 111 TB-HIV patients was 38 ± 9 years (range 22-70) and 107 (96.3%) were men; 104 (93.7%) had a history of drug abuse and 96 (86.4%) had a history of imprisonment. The method of HIV transmission was intravenous drug use in 88 (79.3%). Twenty-three (20.7%) had a history of Category 1 (CAT I) TB treatment and six (5.4%) Category 2 (CAT II) treatment. Combination antiretroviral therapy (cART) was given to 48 (43.2%). No significant associations were found between treatment outcomes or mortality and gender, smoking, drug and alcohol abuse, imprisonment, method of transmission, history of CAT I and CAT II treatments, CD4 counts or adverse effects (P > 0.05). Administration of cART led to significantly better outcomes (P < 0.001). Lower serum albumin levels and low body weight were significantly associated with mortality.

Isoniazid preventive therapy in correctional facilities: a systematic review.

Tuberculosis (TB) remains a major cause of morbidity and mortality worldwide and the main cause of death in correctional facilities in middle- and low-income countries. Due to the closed environment and the concentration of individuals with TB-related risk factors, effective measures are required to control TB in such settings. Isoniazid preventive therapy (IPT) represents an effective and cost-effective measure. Despite international recommendations that IPT be integral to TB control, it is seldom deployed. A systematic review of interventions used to assess IPT initiation and completion in correctional facilities was conducted using published studies from two biomedical databases and relevant keywords. Additional references were reviewed, resulting in 18 eligible studies. Most (72%) studies were conducted in the United States and in jail settings (60%), with the main objective of improving completion rates inside the facility or after release. Studies that provided data about initiation and completion rates showed poor success in correctional facilities. Adverse consequences and treatment interruption ranged from 1% to 55% (median 5%) in reported studies; hepatotoxicity was the most prevalent adverse reaction. Despite its accelerating effect on the development of active TB, information on human immunodeficiency virus (HIV) status was provided in only half of the studies. Among the four studies where IPT effectiveness was assessed, the results mirror those described in community settings. Future studies require thorough assessments of IPT initiation and completion rates and adverse effects, particularly in low- and middle-income countries and where comorbid viral hepatitis may contribute significantly to outcomes, and in settings where TB and HIV are more endemic.

Prevalence and correlates of community re-entry challenges faced by HIV-infected male prisoners in Malaysia.

HIV-infected prisoners face an inordinate number of community re-entry challenges. In 2007, 102 HIV-infected prisoners in Malaysia were surveyed anonymously within six months prior to release to assess the prevalence and correlates of community re-entry challenges. Staying out of prison (60.8%), remaining off drugs (39.2%), finding employment (35.3%) and obtaining HIV care (32.4%) were the re-entry challenges reported most frequently. Global stigma, negative self-image and public attitudes-related stigma were independently associated with challenges to obtaining HIV care. In multivariate analyses, those with previous incarcerations (adjusted odds ratio [AOR], 3.2; 95% confidence interval [CI], 1.4-7.6), higher HIV-related symptoms (AOR, 2.0; 95% CI, 1.0-4.1) and higher public attitudes-related stigma (AOR, 2.5; 95% CI, 1.2-5.1) had a significantly higher likelihood of identifying more re-entry challenges. Targeted interventions, such as effective drug treatment, HIV care and public awareness campaigns, are crucial for stemming the HIV epidemic and improving health outcomes among HIV-infected prisoners in Malaysia.

Trust and the acceptance of and adherence to antiretroviral therapy.

BACKGROUND: Antiretroviral therapy (ART) has resulted in reduced AIDS incidence and mortality. Socially marginalized individuals with HIV infection, particularly injection drug users (IDUs), have received less ART and derived less benefit than others. Little is known about the therapeutic process necessary to promote acceptance of and adherence to ART among marginalized HIV-infected populations. We report on the correlates of both acceptance of and adherence to ART among HIV infected prisoners, most of whom are IDUs. DESIGN: Using a cross-sectional survey design within four ambulatory prison HIV clinics, 205 HIV-infected prisoners eligible for ART were recruited between March and October 1996. MEASUREMENTS: Detailed interviews were conducted that included personal characteristics, health status and beliefs, and validated standardized scales measuring depression, health locus of control, social desirability and trust in physician, medical institutions and society. Acceptance and adherence were documented by self-report and validated for a subset by pharmacy review. Clinical information was obtained from standardized chart review. Adherence was defined as having taken > or = 80% of ART. RESULTS: The acceptance of (80%) and adherence to (84%) ART among this group of prisoners was high. Multiple regression models demonstrated that correlates of acceptance of and adherence to ART differed. Acceptance was associated with trust in physician (8% increase for each unit increase with trust in physician scale) and trust in HIV medications (threefold reduction for those mistrustful of medication). Side effects (OR = 0.09), social isolation (OR = 0.08), and complexity of the antiretroviral regimen (OR = 0.33) were associated with decreased adherence. The prevalence of health beliefs suggesting an adverse relationship between ART and drugs of abuse was high (range 59 to 77%). Adherence did not differ among those receiving directly observed therapy (82%) or self-administration (85%). CONCLUSIONS: ART can be successfully administered within a correctional setting. Trust and the therapeutic relationship between patient and physician remain central in the ART initiation process. Characteristics of the therapeutic agents and the degree of social isolation predict adherence. These results may inform the design of interventions to improve both acceptance of and adherence to ART particularly among marginalized populations who have not derived full benefit from these potent new therapies.

Prevention of HIV infection in street-recruited injection drug users. The Collaborative Injection Drug User Study (CIDUS).

BACKGROUND: Injection drug users (IDUs) and their sex partners account for an increasing proportion of new AIDS and HIV cases in the United States, but public debate and policy regarding the effectiveness of various HIV prevention programs for them must cite data from other countries, from non-street-recruited IDUs already in treatment, or other programs, and from infection rates for pathogens other than HIV. METHODS: Participants were recruited from the street at six sites (Baltimore [Maryland], New York [two sites], Chicago [Illinois], San Jose [California], Los Angeles [California], and at a state women's correctional facility [Connecticut]), interviewed with a standard questionnaire, and located and reinterviewed at one or more follow-up visits (mean, 7.8 months later). HIV serostatus and participation in various programs and behaviors that could reduce HIV infection risk were determined at each visit. RESULTS: In all, 3773 participants were recruited from the street, and 2306 (61%) were located and interviewed subsequently. Of 3562 initial serum specimens, 520 (14.6%) were HIV-seropositive; at subsequent assessment, 19 people, all from the East Coast and Chicago, had acquired HIV. Not using previously used needles was substantially protective against HIV acquisition (relative risk [RR], 0.29; 95% confidence interval [CI], 0.11-0.80 ) and, in a multivariate model, was significantly associated with use of needle and syringe exchange programs (adjusted odds ratio [ORadj], 2.08; 95% CI, 1.15-3.85). Similarly, reduction of injection frequency was very protective against seroconversion (RR, 0.33; 95% CI, 0.14-0.80), and this behavior was strongly associated with participation in drug treatment programs (ORadj, 3.54; 95% CI, 2.50-5.00). In a separate analysis, only 37.5% of study-participants had sufficient new needles to meet their monthly demand. CONCLUSIONS: In this large multicity study of IDUs in the United States, several HIV prevention strategies appeared to be individually and partially effective; these results indicate the continued need for, and substantial gaps in, effective approaches to preventing HIV infection in drug users.

A review of the legal and ethical issues for the conduct of HIV-related research in prisons.

This article sets the stage for future discussions of expanding prisoners' access to clinical trials in an effort to move from commentary and recommendations to changes in practice. It describes barriers to access to clinical trials, the demographics of HIV/AIDS in prisons, the unique situation posed by the potential for HIV-related research in prisons, and examines briefly the history of prisoner research in the U.S. The article considers both ethical and legal responses to clinical trials in prisons, noting the potential for and limitations of legal actions. Finally, it makes recommendations for conditions necessary to conduct ethical research in prisons and calls for more cooperation between prison systems and HIV/AIDS clinical trials researchers to make expanded access to clinical trials a reality.

Syringe source, use, and discard among injection-drug users in New Haven, Connecticut.

We examined syringe source, use, and discard practices of injection-drug users (IDUs) in New Haven, Connecticut, a city with both a legal syringe-exchange program (SEP) and non-prescription availability of syringes through pharmacies. The population demographics, syringe use, and discard practices of IDUs who obtained syringes from various sources were compared using structured interview data. Of the 373 IDUs recruited, 268 (72 percent) resided in the city of New Haven. Among the New Haven IDUs, 111 (41 percent) reported pharmacies, 36 (13 percent) reported the New Haven SEP, 90 (34 percent) reported both, and 27 (10 percent) reported neither as their usual source of syringes in the past six months. No significant differences (p value < 0.05) were observed among New Haven IDUs who relied on pharmacies versus the SEP. However, IDUs who relied on the SEP were significantly less likely to report they threw away used syringes, compared with pharmacy users. Both the pharmacies and the New Haven SEP are important sources of sterile syringes for IDUs in New Haven. The lower frequency of syringe discard by IDUs who obtained their syringes primarily through the SEP indicates another public health benefit of programs such as these.

Health care delivery strategies for criminal offenders.

Men and women under correctional supervision may be the most challenging population of public health concern. Prison inmates, parolees, and probationers experience prevalent infectious disease including HIV and hepatitis C. Many supervised individuals have significant mental or behavioral health problems that require clinical intervention. The U.S. correctional population is also rapidly growing, and now includes more than 5 million men and women. Concerns about quality, accessibility, and cost of correctional care have prompted calls for managed care models in this population. This paper reviews pertinent experiences within Medicaid managed care and suggests four interconnected strategies--outreach, discharge planning, entitlement security, and case management--to improve the quality and efficiency of correctional care.

Nevirapine induced opiate withdrawal among injection drug users with HIV infection receiving methadone.

BACKGROUND: Pharmacokinetic interactions complicate and potentially compromise the use of antiretroviral and other HIV therapeutic agents in patients with HIV disease. This may be particularly so among those receiving treatment for substance abuse. OBJECTIVE: We describe seven cases of opiate withdrawal among patients receiving chronic methadone maintenance therapy following initiation of therapy with the non-nucleoside reverse transcriptase inhibitor, nevirapine. DESIGN: Retrospective chart review. RESULTS: In all seven patients, due to the lack of prior information regarding a significant pharmacokinetic interaction between these agents, the possibility of opiate withdrawal was not anticipated. Three patients, for whom methadone levels were available at the time of development of opiate withdrawal symptoms, had subtherapeutic methadone levels. In each case, a marked escalation in methadone dose was required to counteract the development of withdrawal symptoms and allow continuation of antiretroviral therapy. Three patients continued nevirapine with methadone administered at an increased dose; however, four chose to discontinue nevirapine. CONCLUSION: To maximize HIV therapeutic benefit among opiate users, information is needed about pharmacokinetic interactions between antiretrovirals and therapies for substance abuse.

Clinical guidelines and pharmacist intervention program for HIV-infected patients requiring granulocyte colony-stimulating factor therapy.

Guidelines, implemented by clinical pharmacists, were developed by the pharmacy and therapeutics subcommittee on a dedicated service caring for hospitalized patients with human immunodeficiency virus infection or the acquired immunodeficiency syndrome (AIDS) who required granulocyte colony-stimulating factor (G-CSF) therapy. Drug use and evaluation was conducted on all patients with AIDS who were prescribed G-CSF, and education was provided to medical house staff. Clinical data from chart review and laboratory and billing data bases of the hospital medical information system were compared for the 9-month intervention period (IP) with data from the 9-month preintervention period (PIP). Comparing the IP and PIP, the mean number of G-CSF doses (0.29 vs 0.51) and pharmacy costs per day ($112 vs $200) decreased, with no change in the number of patients requiring G-CSF. The 1.3 pharmacist interventions per patient resulted in a decrease to 2.4 doses per admission from a baseline of 5.9 (p<0.0001). Mean hospital stay (11.9 vs 13.8 days) and mean number of days of neutropenia did not differ for IP and PIP groups. Effectively implemented pharmacist-based interventions can decrease hospital costs without increasing patient morbidity.

Evaluation of an innovative program to address the health and social service needs of drug-using women with or at risk for HIV infection.

Drug-using women with or at risk for HIV infection have many competing unmet needs, especially for social services, drug treatment, and medical care. High-risk drug-using women were recruited through street outreach, at needle exchange sites, a prison, and local community based organizations in New Haven, Connecticut for a study of the service needs of out-of-treatment drug users and the ability of an interactive case management intervention (ICM) to address those needs. These women were administered baseline and follow-up interviews to identify their health and social service needs and the degree to which these needs were resolved. The women who chose to enroll in the interactive case management intervention (n = 38) did not differ demographically nor in their HIV risk behaviors from those not receiving case management (n = 73). Provision of ICM was most successful in meeting needs for supportive mental health counseling, basic services, and long term housing. The impact of interactive case management was less evident for the acquisition of medical and dental services, which were accessed comparably by women not receiving the intervention. Overall, the women who enrolled in the ICM intervention showed a significant decrease in the number of unmet service needs as compared to those who did not enroll. Multiple contacts were required by the case manager to establish trust and to resolve the unmet service needs of these high-risk women. Women with or at risk for HIV infection can be effectively engaged in an ICM intervention in order to meet their multiple unmet service needs, although such interventions are time-and-labor intensive.

Acceptance and adherence with antiretroviral therapy among HIV-infected women in a correctional facility.

We examined attitudinal and demographic correlates of antiretroviral acceptance and adherence among incarcerated HIV-infected women. Structured interviews were conducted with 102 HIV-infected female prisoners eligible for antiretroviral therapy. Three quarters of the women were currently taking antiretroviral agents, of whom 62% were adherent to therapy. Satisfaction was very high with the HIV care offered at the prison; 67% had been first offered antiretroviral agents while in prison. Univariate and multivariate analyses showed acceptance of the first offer of antiretroviral therapy to be associated with trust in medication safety, lower educational level, and non-black race. Current acceptance of therapy was associated with trust in the medication's efficacy and safety. Medication adherence was correlated with the patient-physician relationship and presence of emotional supports. Nearly one half of these HIV-seropositive women were willing to take experimental HIV medications in prison. This was correlated with satisfaction with existing health care, the presence of HIV-related social supports, and perceived susceptibility to a worsening condition. Acceptance and adherence with antiretroviral agents appear to be significantly associated with trust in medications, trust in the health care system, and interpersonal relationships with physicians and peers. Development of models of care that encourage and support such relationships is essential for improving adherence to antiretroviral therapy, especially for populations that have historically been marginalized from mainstream medical care systems.

Predictors of HIV infection among newly sentenced male prisoners.

The prevalence of individuals with or at risk for HIV infection in prisons and jails is severalfold higher than age-adjusted rates in surrounding communities. This HIV serosurvey of 975 newly sentenced male prisoners employed a new methodology that anonymously linked individual information to HIV serologic data. The HIV prevalence was 6.1%; multivariate regression analysis indicated injection drug use (OR = 18.9), black race (OR = 5.5), Hispanic ethnicity (OR = 3.4), psychiatric illness (OR = 3.1) and a history of having had a sexually transmitted disease (OR = 2.2) were independent predictors of HIV infection. Laboratory markers such as hypoalbuminemia, an elevated aspartate aminotransferase (AST) level, leukopenia, anemia, and thrombocytopenia suggest increased risk for HIV among prisoners, particularly in settings where HIV testing resources are scarce. This study, unlike those reported in other geographic regions, indicated that the majority (71%) of HIV-seropositive persons self-reported their HIV status. This finding may suggest that HIV-infected individuals will self-report their status if HIV care is comprehensive and consistent. The large number of HIV-infected individuals within prisons makes prisons important sites for the introduction of comprehensive HIV-related care. This is particularly relevant in that development of new guidelines issued for the management of HIV infection in which potent combination antiretroviral therapy has been demonstrated to decrease morbidity and mortality. The high prevalence of HIV-seronegative inmates with self-reported high-risk behaviors also suggests the importance of prisons as sites for the introduction of appropriate risk-reduction interventions.

Invasive pneumococcal disease: clinical features, serotypes, and antimicrobial resistance patterns in cases involving patients with and without human immunodeficiency virus infection.

We reviewed 153 episodes of invasive pneumococcal disease involving 147 hospitalized patients with and without human immunodeficiency virus (HIV) disease to examine and compare epidemiologic and clinical features, capsular serotypes, and antibiotic susceptibility patterns. HIV infection was the most common risk factor for invasive pneumococcal disease. Pneumococcal disease in HIV-infected individuals was characterized by the greater frequency with which pneumonia was the source of bacteremia (90% vs. 63%) (P < .01) and an increased recurrence rate (15% vs. < 1%) (P < .01). The overall mortality rate was 12% and did not vary by HIV serostatus. Capsular-type data were available for 149 episodes; 90% of the types were among those found in the polyvalent pneumococcal vaccine. The four most common capsular types causing invasive disease were 14, 6b, 9v, and 22f; capsular type 9v was significantly more common among HIV-infected patients (P < .01). Penicillin-resistant isolates were identified in 7.2% of all cases, and their presence did not vary by HIV status; 20% of isolates from cerebrospinal fluid were resistant. The majority of the resistant isolates were of capsular type 9v. Given the worldwide increase in both HIV and penicillin-resistant pneumococcal infections, better preventative and therapeutic strategies are greatly needed.

Albendazole-induced pseudomembranous colitis.

We report a patient with AIDS and intestinal microsporidiosis. While undergoing treatment with albendazole, he developed worsening diarrhea with abdominal pain and fever. The diagnosis of pseudomembranous colitis was made by flexible sigmoidoscopy and a positive stool specimen for Clostridium difficile toxin. The patient's symptoms resolved with oral vancomycin and his stool C. difficile toxin became negative. Albendazole is an antibiotic that is chemically related to metronidazole. Although a few case reports link metronidazole with the development of pseudomembranous colitis, albendazole has not been associated with the development of this condition. The spectrum of antimicrobial activity of albendazole and its efficacy in the treatment of intestinal microsporidiosis are reviewed. Pathogenic mechanisms for the development of pseudomembranous colitis and the epidemiology of this condition in patients with AIDS are discussed.