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A syndrome involving acute urinary retention in combination with sacral radiculitis and cerebrospinal fluid pleocytosis was first described by the American neurosurgeon Charles Elsberg in 1931. In many instances the aetiology is herpes simplex virus type 2 (HSV-2) reactivation from sensory neurons. In this case report we present a 34-year-old pregnant woman with previous undiagnosed sensory lumbosacral symptoms. She was hospitalized with HSV-2 meningitis and lumbosacral radiculitis but no genital rash. A week after the onset of symptoms she developed acute urinary retention, thus indicating Elsberg syndrome.

Syphilis is still a serious disease with diagnostic difficulties. In the present clinical case a patient had a routine serology screen for syphilis and HIV at a venerology clinic. He had previously presented with anogenital tumors, but the diagnosis was uncertain. A polymerase chain reaction (PCR) analysis was performed in addition to serology, and the diagnosis of syphilis in the secondary stage was confirmed. This case demonstrates how PCR technology can assist in the diagnosis of syphilis at early stages and underlines the importance of syphilis screening in homosexual men presenting with anogenital complaints.

Chancroid is a sexually transmitted disease characterized by painful ulcers with a soft margin, necrotic base and purulent exudate. Previously, only sporadic, imported cases have been reported in Denmark. The bacterium is difficult to culture and novel polymerase chain reaction (PCR)-based methods for direct demonstration of bacterial DNA have facilitated rapid verification of the clinical diagnosis. We report two cases which demonstrate import and subsequent local transmission in Denmark. In both cases, the clinical diagnosis was rapidly verified by a combined PCR testing for multiple causes of venereal ulcers.

In the light of the current American epidemic, and since West Nile fever (WNF) has never previously been reported in Denmark, we describe two cases imported from Israel and Canada, respectively. WNF was diagnosed in a 46-year-old Danish tourist returning from Israel and a visiting 73-year-old Canadian citizen with Danish ancestry. The former manifested itself clinically as a mild flu-like illness, the latter as serious infection of the central nervous system. Thus, in addition to representing a rare case of West Nile encephalitis, it also constitutes one of the first reported cases of human infection of Canadian origin.