Temperature-dependent in vitro hepatocytotoxicity of insecticides in bats.

Heterothermic insectivorous bats are supposed to experience differential adverse effects of insecticidal pollutants depending on their seasonal and/or daily variation of metabolic and detoxification rates. Here, we investigated effects of imidacloprid, cypermethrin and fipronil on Nyctalus noctula bat-derived hepatocytes through cytotoxicity, cell inhibition and death at different concentrations (0.01, 0.

Higher antibody titres against are associated with less white-nose syndrome skin lesions in Palearctic bats.

Introduction: Serological tests can be used to test whether an animal has been exposed to an infectious agent, and whether its immune system has recognized and produced antibodies against it. Paired samples taken several weeks apart then document an ongoing infection and/or seroconversion.

Methods: In the absence of a commercial kit, we developed an indirect enzyme-linked immunosorbent assay (ELISA) to detect the fungus-specific antibodies for , the agent of white-nose syndrome in bats.

Case report: Filarial infection of a parti-coloured bat: sp. adult worms in abdominal cavity and microfilariae in bat semen.

Background: Filarial infections have been understudied in bats. Likewise, little is known about pathogens associated with the reproductive system in chiropterans. While semen quality is critical for reproductive success, semen-borne pathogens may contribute to reproductive failure.

Bat-derived cells use glucose as a cryoprotectant.

Evolution of heterothermy in environments with variable temperatures has allowed bats to survive food scarcity during seasonal climatic extremes by using torpor as a hibernation strategy. The controlled reduction of body temperature and metabolism through complex behavioural and physiological adaptations at organismal, organ, cellular and molecular levels includes the ability of tissues and cells to adapt to temperature alterations. Based on the prediction that cells of different tissues cultured in vitro would differ in their ability to withstand freezing and thawing of the medium, we determined the survival rate of bat-derived cells following exposure to -20 °C for 24 h in media with no cryoprotective agents or medium supplemented by glucose in concentration range 0-3333 mM.

Transcriptomic responses of bat cells to European bat lyssavirus 1 infection under conditions simulating euthermia and hibernation.

Background: Coevolution between pathogens and their hosts decreases host morbidity and mortality. Bats host and can tolerate viruses which can be lethal to other vertebrate orders, including humans. Bat adaptations to infection include localized immune response, early pathogen sensing, high interferon expression without pathogen stimulation, and regulated inflammatory response.

Higher white-nose syndrome fungal isolate yields from UV-guided wing biopsies compared with skin swabs and optimal culture media.

Background: North American bat populations have suffered severe declines over the last decade due to the Pseudogymnoascus destructans fungus infection. The skin disease associated with this causative agent, known as white-nose syndrome (WNS), is specific to bats hibernating in temperate regions. As cultured fungal isolates are required for epidemiological and phylogeographical studies, the purpose of the present work was to compare the efficacy and reliability of different culture approaches based on either skin swabs or wing membrane tissue biopsies for obtaining viable fungal isolates of P.

Performance of bat-derived macrophages at different temperatures.

Heterothermy, as a temperature-dependent physiological continuum, may affect host-pathogen interactions through modulation of immune responses. Here, we evaluated proliferation and functional performance of a macrophage cell line established from the greater mouse-eared () bat at 8, 17.5, and 37°C to simulate body temperatures during hibernation, daily torpor and euthermia.

Blood Parasites and Health Status of Hibernating and Non-Hibernating Noctule Bats ().

Co-existence of bats with a wide range of infectious agents relates to their co-evolutionary history and specific physiology. Here, we examined blood samples collected during hibernation and the post-hibernation period to assess the influence of trypanosomes and babesias on the health status of 50 Noctule bats () using nested PCR. The impact of blood parasites on health was assessed by analysis of haematology and blood chemistry parameters in 21 bats.

One or two pups - optimal reproduction strategies of common noctule females.

Background: The success of animal reproduction is impacted by a trade-off between energetic costs and mortality associated with immediate vs. future reproductive attempts. The reproductive strategies of European insectivorous bats differ from common mammalian standards due to the use of delayed fertilisation.

Low-level pathogen transmission from wild to farmed salmonids in a flow-through fish farm.

While the potential effects of pathogens spread from farmed fish to wild populations have frequently been studied, evidence for the transmission of parasites from wild to farmed fish is scarce. In the present study, we evaluated natural bacterial and parasitic infections in brown trout (Salmo trutta m. fario) collected from the Černá Opava river (Czech Republic) as a potential source of infections for rainbow trout (Oncorhynchus mykiss) reared in a flow-through farm system fed by the same river.

Diclofenac-induced cytotoxicity in cultured carp leukocytes.

Diclofenac is a drug commonly used in human and veterinary medicine for the treatment of diseases associated with inflammation and pain. Medicinal products enter waste and surface waters on an everyday basis and contaminate the aquatic environment. Fish are therefore permanently exposed to these chemicals dissolved in their aquatic environment.

Urinary shedding of leptospires in palearctic bats.

Leptospirosis is a bacterial zoonotic infection of worldwide occurrence. Bats, like other mammalian reservoirs, may be long-term carriers that maintain endemicity of infection and shed viable leptospires in urine. Direct and/or indirect contact with these Leptospira shedders is the main risk factor as regards public health concern.

Active surveillance for antibodies confirms circulation of lyssaviruses in Palearctic bats.

Background: Palearctic bats host a diversity of lyssaviruses, though not the classical rabies virus (RABV). As surveillance for bat rabies over the Palearctic area covering Central and Eastern Europe and Siberian regions of Russia has been irregular, we lack data on geographic and seasonal patterns of the infection.

Results: To address this, we undertook serological testing, using non-lethally sampled blood, on 1027 bats of 25 species in Bulgaria, the Czech Republic, Poland, Russia and Slovenia between 2014 and 2018.

Field study indicating susceptibility differences between salmonid species and their lineages to proliferative kidney disease.

Tetracapsuloides bryosalmonae (Myxozoa: Malacosporea) is the causative agent of proliferative kidney disease (PKD), which affects both wild and farmed salmonid fish. The objective of this study was to outline differences in susceptibility to PKD in different salmonid species, hybrids and breeding lineages. Susceptibility to T.

Health Surveillance of Wild Brown Trout () in the Czech Republic Revealed a Coexistence of Proliferative Kidney Disease and Infection.

The population of brown trout () in continental Europe is on the decline, with infectious diseases confirmed as one of the causative factors. However, no data on the epizootiological situation of wild fish in the Czech Republic are currently available. In this study, brown trout (n = 260) from eight rivers were examined for the presence of viral and parasitical pathogens.

Hepatic perfusion changes in patients with cirrhosis indices of hepatic arterial blood flow.

Purpose: This study used radionuclide angiography to evaluate semiquantitatively the hepatic arterial blood flow changes associated with cirrhosis.

Methods: The parameters of net arterial hepatic perfusion were estimated by analysis of first-pass flow studies in 11 control participants and in 15 patients with cirrhosis (Child-Pugh classification B-C). Hepatic, renal, and splenic time-activity curves were generated, normalized per pixel, and corrected for background.

[Life prognosis in patients with prehepatic portal hypertension treated with portosystemic shunts].

The authors present the results of the long-term follow up of nine patients with prehepatic portal hypertension treated by a portosystemic anastomosis. The evaluation was made 5-21 years after operation, according to criteria focused on the therapeutic effect of the anastomosis and its possible pathophysiological sequelae. In the authors' opinion the anastomosis is the operation of choice suited for patients lacking a tendency of normalization of the portal circulation and with dangerous manifestations of portal overpressure.

[Traumatic chylothorax and chyloperitoneum].

Traumatic chylothorax and chyloperitoneum are rare. Effusion of the chyle into the pleural cavity occurs after severe injuries of the chest wall after pretentious surgical operation in the posterior mediastinum and after operations of the cardiovascular system. The authors recorded one observation after operation of a patent ductus arteriosus and controlled the situation by a conservative procedure.

[Obliterative disease of the carotid and peripheral arteries in hyperlipoproteinemia].

The authors give an account of changes of the carotid and peripheral arteries detected by ultrasonic examination in a group of 133 patients with different forms of primary hyperlipoproteinaemias. Stenoses in the extracranial carotid circulation were found in 31% of the group, stenoses of the peripheral arteries in 37%; in 18% combined changes of the carotid and peripheral system were found. The authors proved a rising trend of the number of risk factors with the rising number of arterial stenoses.

Importance of spectral analysis indices for assessment of the grade of stenosis of the arteria carotis interna.

The authors evaluated the indices of Doppler power frequency spectrum analysis in 106 patients with suspected extracranial carotid occlusive disease. Blackshear, Norrving and Knox indices appeared to be most sensitive for identification of the grade of stenosis of the arteria carotis interna. Sensitivity of ultrasound examination was correlated with angiography.

Radionuclide hepatic perfusion index and ultrasonography: assessment of portal hypertension in clinical practice.

The final value of portal blood flow pressure depends on the degree of vascular obstruction, then on the resistance in collateral vessels and, last, on splanchnic blood flow. The iniciating cause of portal hypertension most often lies in advancing anatomical damage leading to increased resistance and, consequently, to a reduction of portal blood flow, and simultaneous reciprocal development of extrahepatic collaterals. The determination of a true portal flow is a necessity particularly when deciding about a shunt surgery and its type, but it also supplies valuable information on the degree of portal flow restriction and, in this way, on the progress of pathophysiological changes, their extent and advance.