[Prevalence of human immunodeficiency virus infection in drug addicts assisted from 1991 to 1996 at a detoxification center in Castilla y Leon].

Background: The Word Health Organization (WHO) has recommended epidemiologic surveillance of infection by the human immunodeficiency virus (HIV) in high risk populations. An important decrease has recently been observed in the prevalence of HIV infection in drug addicts in different regions in Spain with notable differences being found. The evolution of the prevalence of HIV infection in intravenous drug addicts initiating detoxication in Castilla and Leon was analyzed.

[High prevalence without reactivation of herpes virus 6 in subjects with chronic fatigue syndrome].

Introduction: Chronic fatigue syndrome (CFS) is a disorder of unknown etiology. Some viruses have been associated with CFS etiology, specially herpesviruses, enteroviruses and retroviruses. Some studies suggest an association between human herpesvirus-6 (HHV-6) and CFS.

[The rapid specific characterization of clinical isolates of the genus Mycobacterium by the polymerase chain reaction and restriction enzyme analysis].

Background: Typing at species level of Mycobacterium is usually performed by microbiological and biochemical methods that require a long time and/or sufficient amount of bacteria. Molecular biology can avoid these problems using different techniques.

Methods: A colony growth of the following mycobacteria has been analyzed: M.