[Long-term fever as a first symptom of neoplasmatic process in young patients--case reports].

Unlabelled: Fever is a thermoregulation disorder with body temperature increased (above 38 degrees C). The most often accompanies infections, but it may also be a symptom of neoplasmatic disease.

Case Reports: In our paper we described 2 patients, who were admitted to the Department of Infectious Diseases and Neuroinfections with fever as a main symptom.

[Neuroradiologic imaging results suggestive of parasitic cysts in central nervous system in course of neoplastic disorders--cases report].

Cystic changes within CNS, revealed by computed tomography or magnetic resonance imaging, pose difficult diagnostic and therapeutic problem. We present two patients with primary diagnosis of parasitic cysts of CNS, in whom neoplastic etiology was finally confirmed. Differential diagnosis of cystic foci should from the beginning include not only parasitic infections, but also neoplastic diseases, which are much more frequent in Poland at present and in which prolonged diagnostic process and delayed treatment is highly unfavorable.

[Blood-brain barrier--function of Mato cells].

Brain because of its functions, is isolated from either external or internal environment. This function is performed by skull, cerebral meninges, cerebrospinal fluid and unique system of mechanisms and barriers restricting exchange of oxygen, soluble substances between blood, nervous tissue and cerebrospinal fluid. Mato cells, located in Virchow-Robin's space play a key role in blood-brain barrier.

[Reinfection in Lyme borreliosis].

Persons exposed to tick bites in endemic areas of Lyme borreliosis are at high risk of repeated infections with Borrelia burgdorferi s.l. Typically, recurrent episodes of Lyme borreliosis present as erythema migrans, but systemic manifestations, like borrelial arthritis and meningitis, have been described.

[Re-infection with Borrelia burgdorferi s.l in a patient with a history of neuroborreliosis--case report].

Reinfection with Borrelia burgdorferi s.l., which is likely in highly exposed persons, has not been described in Poland so far.

[Failures of antibiotic treatment in Lyme arthritis].

Antibiotic treatment has been proven to be effective in about 90% of patients with Lyme arthritis in controlled studies. Overt arthritis persisting in spite of antibiotic therapy is rare and most likely has an autoimmune background. More frequently, patients with history of Lyme borreliosis present with non-specific articular and musculosceletal symptoms, which seem to be permanent sequelae of arthritis or constitute part of so called post-Lyme disease syndrome, of unclear pathogenesis.

[Detection of anti-hantavirus antibodies in forest workers in the north-east of Poland].

Objective: To estimate exposition to hantaviruses in a high-risk population (forest workers) in the north-east of Poland.

Methods: IgG antibodies against virus Puumala (PUUV) and Hantaan (HTNV) were detected by ELISA in sera of 59 forest workers from Podlaskie and Warmińsko-Mazurskie provinces (group I), as well as in 10 employees of Regional Forest Administration in Białystok (group II).

Main Observations: Anti-PUUV IgG antibodies were detected in 3 persons in group I and 1 in group II.