[Infectious diseases-past, present, future].

The complex interactions between microorganisms and humans include the well-known, traditional infectious diseases and also the symbiotic relationship with the human endogenous normal flora. Forty years ago everybody was convinced that medicine would soon be able to eradicate most of the infectious diseases. Perception of victory over infectious diseases has been blunted in recent years by nosocomial infections and by the new and re-emerging diseases.

[Chlamydia trachomatis infections].

Chlamydia trachomatis is the most common bacterial cause of sexually transmitted disease in the developed countries. The most important implications of genital chlamydia infections involve the reproductive health sequalae of upper genital tract infections in women: pelvic inflammatory disease, ectopic pregnancy, and infertility, infection by this organism is insidious, symptoms are absent or minor among most infected women and many man. This large group of asymptomatic and infectious persons sustains transmission within a community.

[Successful meropenem therapy of recurrent multiple brain abscess].

Authors describe the history of a 37-year-old man suffering from multiple purulent brain abscess. The multiple brain abscess evolved primarily from a gluteal abscess to the lung, and secondarily from the lung to the brain by hematogenous spreading of the bacteria. The identification of the pathogene/s was unsuccessful despite numerous bacteriological examination.

Prevalence of Chlamydia pneumoniae antibodies in Hungary.

Investigation of Chlamydia pneumoniae (TWAR) antibodies in paired sera of 120 patients with various respiratory diseases revealed a prevalence of 4.2% of IgG seroconversion. IgG antibody without seroconversion was found in 83.

[Opportunistic systemic mycoses].

Systemic fungal infections can be primary or opportunistic. The mycoses caused by opportunistic pathogens become increasingly more important. These infections are mainly caused by Candida species, Aspergillus species, Cryptococcus neoformans, Mucor etc.