Nongonococcal Urethritis—A New Paradigm

Nongonococcal urethritis--a new paradigm.

Urethritis in men has been categorized historically as gonococcal or nongonococcal (NGU). The major pathogens causing NGU are Chlamydia trachomatis and Ureaplasma urealyticum. Trichomonas vaginalis may be involved occasionally. In up to one-half of cases, an etiologic organism may not be identified. In this review we present recent advances in the diagnosis and management of NGU and discuss how...

Therapeutics of nongonococcal urethritis.

Primary non-gonococcal urethritis of venereal origin is usually abacterial. This is also the case when the disease follows rectal coitus (Harkness, 1950). When organisms are present in the secretions in untreated cases the disease is more likely to have been caused by infections descending from a urethral stricture, the prostate, or lesions of the upper urinary tract. It can also be caused mech...

Nongonococcal Urethritis and Related Infections

explain the nature of cell differentiation, going back to Weissman's theory of selective loss of hereditary determinants, and brings us up to date with the latest views on differential genetic programming. He argues persuasively that cloning of embryonic and adult cells is an appropriate assay system for determining totipotency, genetic equivalency, and reversibility of differentiation in nucle...

Toward a New Paradigm

This paper provides a context for the Dahlem Workshop on “Earth Systems Science and Sustainability.” We begin by characterizing the contemporary epoch of Earth history in which humanity has emerged as a major — and uniquely self-reflexive — geological force. We turn next to the extraordinary revolution in our understanding of the Earth system that is now underway, pointing out how it has built ...

Why a New Paradigm?