Central nervous system toxoplasmosis in AIDS

Blind spots in the epidemiology of HIV in black Americans

In the USA, annual rates of new human immunodeficiency virus (HIV)/AIDS diagnoses are seven and 21 times higher in black men and women, respectively, than in whites. Epidemiological inquiry on this disparity has chiefly focused on contextual factors; such emphasis has eclipsed study of direct HIV vectors. The US Centers for Disease Control and Prevention recently announced its intention to curb HIV propagation in black communities, recommending culturally appropriate HIV/AIDS strategies. Contemplated societal interventions should be informed by data evaluating more direct (and under-assessed) HIV transmission vectors, specifically anal intercourse and unsuspected blood exposures. This recommendation involves tracing sexual and non-sexual contacts of recently infected persons and uninfected controls, coupled with DNA sequencing of HIV isolates. Public health authorities do not know the extent to which unmeasured yet plausible HIV transmission vectors can account for ethnic disparities. Appropriate prevention strategies depend critically on direct, rather than ecologic, evidence.

Prevalence of IgG and IgM anti-Toxoplasma antibodies in patients with HIV and acquired immunodeficiency syndrome (AIDS)

With the emergence of the human immunodeficiency virus (HIV), in patients with acquired immunodeficiency syndrome (AIDS), Toxoplasma gondii has arisen as an important opportunist pathogenic agent, especially in the central nervous system, being the most common cause of intracerebral lesions. The incidence of Toxoplasma gondii in HIV-infected patients depends principally on the existence of latent Toxoplasma parasitosis in the population affected. Through the enzyme-linked immunosorbent assay (ELISA), IgG and IgM anti-Toxoplasma antibodies were found in 92 patients of which 46 (50.0%) were IgG seropositive, and only one case (1.0%) had IgM antibodies. Of the 92 patients: 53 were HIV seropositives and 39 had AIDS. The detection and monitoring of anti-Toxoplasma antibodies in HIV patients is essential, since in this group there is a high percentage risk of developing cerebral toxoplasmosis, which is the second cause of death in this type of patients.

Patients misrepresenting their risk factors for AIDS

To determine the truthfulness of patients' and research subjects' self-reports of their sexual and drug use histories in studies of human immunodeficiency virus (HIV) transmission and acquired immunodeficiency syndrome (AIDS) risk factors, studies of or pertinent to lying about AIDS risk factors were extracted from MEDLINE and PSYCLIT. The present paper describes normal and pathological motives for misrepresenting risk factors, and reviews the literature on such underreporting. There is much evidence for lying about anal intercourse and intravenous drug use risk factors, implying that the estimates of risk for vaginal transmission of HIV (particularly in Pattern-I industrialized countries) have been inflated. Research on HIV/AIDS behavioural risk factors must include sophisticated methods for the assessment of self-report validity, such as the use of behavioural markers, improved lie scales and interview methods, and physical methods.