Abundance, diversity and community composition of free-living protozoa on vegetable sprouts.

Interactions with free-living protozoa (FLP) have been implicated in the persistence of pathogenic bacteria on food products. In order to assess the potential involvement of FLP in this contamination, detailed knowledge on their occurrence, abundance and diversity on food products is required. In the present study, enrichment and cultivation methods were used to inventory and quantify FLP on eight types of commercial vegetable sprouts (alfalfa, beetroot, cress, green pea, leek, mung bean, red cabbage and rosabi). In parallel, total aerobic bacteria and Escherichia coli counts were performed. The vegetable sprouts harbored diverse communities of FLP, with Tetrahymena (ciliate), Bodo saltans and cercomonads (flagellates), and Acanthamoeba and Vannella (amoebae) as the dominant taxa. Protozoan community composition and abundance significantly differed between the sprout types. Beetroot harbored the most abundant and diverse FLP communities, with many unique species such as Korotnevella sp., Vannella sp., Chilodonella sp., Podophrya sp. and Sphaerophrya sp. In contrast, mung bean sprouts were species-poor and had low FLP numbers. Sampling month and company had no significant influence, suggesting that seasonal and local factors are of minor importance. Likewise, no significant relationship between protozoan community composition and bacterial load was observed.

Behavior of Yersinia enterocolitica in the presence of the bacterivorous Acanthamoeba castellanii.

Free-living protozoa play an important role in the ecology and epidemiology of human-pathogenic bacteria. In the present study, the interaction between Yersinia enterocolitica, an important food-borne pathogen, and the free-living amoeba Acanthamoeba castellanii was studied. Several cocultivation assays were set up to assess the resistance of Y. enterocolitica to A. castellanii predation and the impact of environmental factors and bacterial strain-specific characteristics. Results showed that all Y. enterocolitica strains persist in association with A. castellanii for at least 14 days, and associations with A. castellanii enhanced survival of Yersinia under nutrient-rich conditions at 25°C and under nutrient-poor conditions at 37°C. Amoebae cultivated in the supernatant of one Yersinia strain showed temperature- and time-dependent permeabilization. Intraprotozoan survival of Y. enterocolitica depended on nutrient availability and temperature, with up to 2.8 log CFU/ml bacteria displaying intracellular survival at 7°C for at least 4 days in nutrient-rich medium. Transmission electron microscopy was performed to locate the Yersinia cells inside the amoebae. As Yersinia and Acanthamoeba share similar ecological niches, this interaction identifies a role of free-living protozoa in the ecology and epidemiology of Y. enterocolitica.

Free-living protozoa in the gastrointestinal tract and feces of pigs: Exploration of an unknown world and towards a protocol for the recovery of free-living protozoa.

Associations with free-living protozoa (FLP) have been implicated in the persistence of foodborne pathogenic bacteria in food-related environments. To date however no information is available on the presence of FLP in the gastrointestinal tract (GIT) of pigs, which represents an important reservoir for zoonotic foodborne bacteria and hence a potential location for associations with FLP. This is at least partly due to the lack of adequate protocols to recover FLP from intestinal content and feces. In the present study different protocols to recover FLP from the porcine GIT and feces were tested. The most effective protocols were then applied to explore the presence of live FLP in the pig GIT and feces. A filtration based protocol was identified as the most suitable method to recover viable FLP from the porcine GIT and feces. Cultivable FLP were recovered from different parts of the GIT, suggesting at least a transient presence of FLP in this habitat. Free-living amoebae species (Acanthamoeba spp., Hyperamoeba sp., Vannella sp., Vermamoeba vermiformis, hartmannellids and vahlkampfiids) but also ciliates (Colpoda sp. and Tetrahymena/Glaucoma lookalike) and flagellates (cercomonads, bodonids and glissomonads) were recovered and cultured from pig intestinal content. Acanthamoeba hatchetti and Filamoeba sinensis were isolated for the first time from pig intestinal content. Despite high gastric acidity, non-cyst forming amoeba species were also detected which suggests survival of their trophozoites in the animal GIT.

Giant cell arteritis in a 19-year-old woman associated with vertebral artery aneurysm and subarachnoid hemorrhage.

Giant cell arteritis (GCA) is a disease chiefly found in elderly patients. Intracranial vessels are rarely involved in GCA. Here we report the case of a 19-year-old woman with GCA in the basilar and vertebral arteries. Two weeks after the first symptoms, she developed an aneurysmatical dilatation of the right vertebral artery which ruptured leading to subarachnoid hemorrhage. Although the ruptured right vertebral artery was clipped neurosurgically, she died two days later. Autopsy revealed GCA with focal medial necrosis and intimal thickening of the vertebral arteries and the basilar artery. No other arteries were affected. In the involved vessels, the media exhibited C1q immunoreactivity. At the intimal site of the internal elastic lamina there were increased levels of elastase. Other arterial diseases showing the pattern of GCA were excluded. This case demonstrates that GCA is not necessarily restricted to elderly people. Moreover, this case shows that a GCA-induced aneurysm is a very rare reason for subarachnoid hemorrhage even in young adults.

Co-occurrence of free-living protozoa and foodborne pathogens on dishcloths: implications for food safety.

In the present study, the occurrence of free-living protozoa (FLP) and foodborne bacterial pathogens on dishcloths was investigated. Dishcloths form a potentially important source of cross-contamination with FLP and foodborne pathogens in food-related environments. First various protocols for recovering and quantifying FLP from dishcloths were assessed. The stomacher technique is recommended to recover flagellates and amoebae from dishcloths. Ciliates, however, were more efficiently recovered using centrifugation. For enumeration of free-living protozoa on dishcloths, the Most Probable Number method is a convenient method. Enrichment was used to assess FLP diversity on dishcloths (n=38). FLP were found on 89% of the examined dishcloths; 100% of these tested positive for amoebae, 71% for flagellates and 47% for ciliates. Diversity was dominated by amoebae: vahlkampfiids, vannellids, Acanthamoeba spp., Hyperamoeba sp. and Vermamoeba vermiformis were most common. The ciliate genus Colpoda was especially abundant on dishcloths while heterotrophic nanoflagellates mainly belonged to the genus Bodo, the glissomonads and cercomonads. The total number of FLP in used dishcloths ranged from 10 to 10(4) MPN/cm(2). Flagellates were the most abundant group, and ciliates the least abundant. Detergent use was identified as a prime determinant of FLP concentrations on used dishcloths. Bacterial load on dishcloths was high, with a mean total of aerobic bacteria of 7.47 log 10 cfu/cm(2). Escherichia coli was detected in 68% (26/38) of the used dishcloths, with concentrations up to 4 log 10 cfu/cm(2). Foodborne pathogens including Staphylococcus aureus (19/38), Arcobacter butzleri (5/38) and Salmonella enterica subsp. enterica ser. Halle (1/38) were also present. This study showed for the first time that FLP, including some opportunistic pathogens, are a common and diverse group on dishcloths. Moreover, important foodborne pathogens are also regularly recovered. This simultaneous occurrence makes dishcloths a potential risk factor for cross-contamination and a microbial niche for bacteria-FLP interactions.

[Clinical management of an androgen insensitivity syndrome]. / Klinisches Management beim Androgeninsensivitätssyndrom.

The seldom occurring androgen insensitivity syndrome is characterised by male karyotype in a phenotypical women. We report on a complete androgen insensitivity syndrome with the rare coincidence of bilateral Fallopian tubes and a testicular intraepithelial neoplasia. Additionally we discuss aspects of incidence, molecular background, characteristics, diagnostic pitfalls and therapy against the background of the current literature.

Successful treatment of disseminated mucormycosis with a combination of liposomal amphotericin B and posaconazole in a patient with acute myeloid leukaemia.

The combination of resection of infected tissue and antifungal therapy is the treatment of choice in mucormycosis. In disseminated mucormycosis, where surgery is impossible, the mortality is almost 90%. We report the first case of disseminated mucormycosis that was cured with a combination therapy of liposomal amphotericin B and posaconazole without surgical intervention.

Diagnosis of invasive aspergillosis and mucormycosis in immunocompromised patients by seminested PCR assay of tissue samples.

Aspergillosis and mucormycosis are the most common mold infections in patients with hematological malignancies. Infections caused by species of the genus Aspergillus and the order Mucorales require different antifungal treatments depending on the in vitro susceptibility of the causative strain. Cultures from biopsy specimens frequently do not grow fungal pathogens, even from histopathologically proven cases of invasive fungal infection. Two seminested PCR assays were evaluated by amplifying DNA of zygomycetes and Aspergillus spp. from organ biopsies of 21 immunocompromised patients. The PCR assays correctly identified five cases of invasive aspergillosis and six cases of mucormycosis. They showed evidence of double mold infection in two cases. Both assays were negative in five negative controls and in two patients with yeast infections. Sequencing of the PCR products was in accordance with culture results in all culture-positive cases. In six patients without positive cultures but with positive histopathology, sequencing suggested a causative organism. Detection of fungal DNA from biopsy specimens allows rapid identification of the causative organism of invasive aspergillosis and mucormycosis. The use of these PCR assays may allow guided antifungal treatment in patients with invasive mold infections.

[Microcolpohysteroscopy]. / Die Mikrokolpohysteroskopie (MCH).

Microcolpohysteroscopy (MCH) is a method of contact microscopic examination of the ecto- and endocervical epithelium after in vivo staining. To investigate the capability of this procedure, to visualise exactly and identify the margins of cervical intraepithelial neoplasias (CIN), 85 patients with pathological pap smears and two patients with suspicious colposcopy were examined by MCH, microbiopsy from suspicious areas of epithelium and subsequent histology. The ability of MCH to identify and demarcate CIN lesions was verified. It would appear, that using this method, the therapy of higher-grade CIN can be tailored more adequately to the size of the lesion without loss of reliability in respect of the completeness of excision.

[Crack-syndrome: the pulmonary complications of inhaled cocaine. A review a propos a case report]. / Crack-Syndrom: Pulmonale Komplikationen nach Kokaininhalation--Kasuistik und Darstellung des Krankheitsbildes.

A 45-year-old patient developed shortness of breath, intensive cough, hemoptysis, chest pain and acute bilateral pulmonary infiltrates following the inhalation of crack-cocaine. The bronchoalveolar lavage and transbronchial biopsy revealed infiltrations of polymorphonuclear neutrophils and the formation of foreign body granulomas. The diagnosis of a crack-syndrome was made and the patient rapidly improved under temporary discontinuation of cocaine inhalation and symptomatic therapy. Crack-cocaine is the free-base of cocaine-hydrochloride and its chemical properties allows it to be inhaled tobacco-like. Therefore the lungs become the principal organs exposed and affected. In addition to our findings, diffuse damage of the alveolar wall and capillary injury due to vasoconstriction and toxic action were reported, in some cases rapidly progressing into pulmonary oedema and ARDS. As the consumption of crack cocaine in Germany has markedly increased over the past decade, a higher prevalence of the reported syndrome has to be assumed.

[Alagille syndrome, a rare differential diagnosis of intrahepatic cholestasis]. / Das Alagille-Syndrom, eine seltene Differentialdiagnose der intrahepatischen Cholestase.

In Alagille's syndrome cholestasis is caused by a congenital hypoplasia of the intrahepatic bile ducts. If cardiac and arterial malformations are present in conjunction with the typical-but not pathognomonic-facies, this rare syndrome must be considered. ERCP shows a highly rarified bile duct system. Liver histology with a paucity of interlobular bile ducts establishes the diagnosis. Inheritance appears to be autosomal dominant. The relatively good prognosis of the disease calls for caution concerning invasive procedures.

Successful treatment of glucagonoma-related necrolytic migratory erythema with dacarbazine.

A 63-year-old man with a glucagonoma syndrome is described. The diagnosis was confirmed by necrolytic migratory erythema, which is the most distinctive feature of the clinical syndrome. There was no chance of operative resection of the tumor because of liver metastases at the time of diagnosis. The patient was treated with dacarbazine. During this treatment the skin lesions disappeared completely.

Retrobulbar neuritis as the first sign of the glucagonoma syndrome.

A 63-year-old man with a metastasising pancreatic glucagonoma is described, who presented with progressive deterioration of vision and bilateral central scotomata as the first symptom. This patient was treated with dacarbazine (DTIC) 250 mg/m2 IV daily for five consecutive days at 4-week intervals. The vision returned completely to normal, in a clinical and biochemical remission. Although there is no wide experience in treatment, the literature seems to indicate that DTIC should be the drug of choice in treating metastatic glucagonoma. Central scotomata may be a new 'paraneoplastic' symptom and a key to the earlier diagnosis of the glucagonoma syndrome by ophthalmologists, just as necrolytic migratory erythema has been for the dermatologists.

Diagnosis of invasive fungal infections in hematology and oncology--guidelines of the Infectious Diseases Working Party (AGIHO) of the German Society of Hematology and Oncology (DGHO).

Invasive fungal infections are a primary cause of morbidity and mortality in patients with hematological malignancies. Establishing a definite diagnosis of invasive fungal infection in febrile neutropenic patients is particularly challenging and time-consuming, but a delay of antifungal treatment leads to higher mortality. This situation has lead to the strategy of initiation "empirical" antifungal therapy prior to the detection of fungi. Meanwhile, improvements in diagnostic procedures are achieved, especially with imaging techniques and non-culture based methods which include antigen-based assays, metabolite detection and molecular detection of fungal DNA from body fluid samples using conserved or specific genome sequences. The AGIHO presents recommendations for the diagnosis of invasive fungal infections with risk-adapted screening concepts for the neutropenic and febrile episodes of patients with hemato-oncological disorders.