The Role of Bioacoustic Signals in Koala Sexual Selection: Insights from Seasonal Patterns of Associations Revealed with GPS-Proximity Units.

Despite being a charismatic and well-known species, the social system of the koala (Phascolarctos cinereus--the only extant member of the family Phascolarctidae) is poorly known and much of the koala's sociality and mating behaviors remain un-quantified. We evaluated these using proximity logging-GPS enabled tracking collars on wild koalas and discuss their implications for the mating system of this species. The frequency and duration of male-female encounters increased during the breeding season, with male-male encounters quite uncommon, suggesting little direct mating competition. By comparison, female-female interactions were very common across both seasons. Body mass of males was not correlated with their interactions with females during the breeding season, although male size is associated with a variety of acoustic parameters indicating individuality. We hypothesise that vocal advertising reduces the likelihood of male-male encounters in the breeding season while increasing the rate of male-female encounters. We suggest that male mating-season bellows function to reduce physical confrontations with other males allowing them to space themselves apart, while, at the same time, attracting females. We conclude that indirect male-male competition, female mate choice, and possibly female competition, mediate sexual selection in koalas.

A gastrointestinal stromal tumour presenting incidentally with haemorrhage and perforation associated with a Meckel's diverticulum: a case report.

INTRODUCTION: This is the first reported case of perforation and haemorrhage of a Meckel's diverticulum leading to the incidental finding of a gastrointestinal stromal tumour within the diverticulum. Meckel's diverticulum is the most common congenital abnormality of the gastrointestinal tract, however, when symptomatic, it is often misdiagnosed at presentation. Common complications presenting in adults include bleeding, obstruction, diverticulitis and perforation. Tumours within a Meckel's diverticulum are a rare but recognised complication. We discuss the management of a gastrointestinal tumour within the diverticulum. CASE PRESENTATION: A 59-year-old Caucasian man presented with acute right iliac fossa pain with localized peritonism. At surgery, he was found to have a perforated and haemorrhagic Meckel's diverticulum, associated with a gastrointestinal stromal tumour within the apex of the diverticulum. The absence of necrosis and a low mitotic rate indicated primary resection with subsequent computed tomography surveillance to be the most appropriate management strategy. CONCLUSION: We report a unique triad of complications associated with the presentation of a Meckel's diverticulum. This article reviews this common congenital abnormality and discusses the management of a gastrointestinal tumour. Meckel's diverticulum will mimic other intra-abdominal pathologies in presentation and should therefore often be considered as a differential diagnosis.

Clostridium difficile: how much do hospital staff know about it?

INTRODUCTION: The aim of this study was to determine the awareness of Clostridium difficile infection amongst healthcare professionals. SUBJECTS AND METHODS: A total of 132 healthcare professionals (18 consultants, 40 trainee doctors, and 74 nursing staff) in our hospital were randomly surveyed using a questionnaire consisting of 17 questions covering various aspects of C. difficile. RESULTS: More than 50% of healthcare professionals correctly identified C. difficile as an anaerobic bacillus. Half of the consultants and one-third of the trainees and nurses were aware that 5% of adults carry C. difficile in the gut. Overall, 80% of doctors and 40% of nursing staff (P = 0.001) were aware of the spectrum of illnesses caused by C. difficile. Seven (39%) consultants, 25 (63%) trainees, and 26 (37%) nurses correctly identified the various predisposing factors for the acquisition of C. difficile infection. Only one-third of doctors and 8% of nursing staff were aware that antibiotic restriction was the single most effective C. difficile infection control measure. In addition, 40% of doctors and 8% of nursing staff were aware that cytotoxin assay is the gold standard diagnostic test. Less than 30% of healthcare professionals were aware of the differences between the most common strain and the strain of C. difficile responsible for recent outbreaks. Only 6 (33%) consultants, 21 (53%) trainees (P = not significant), and 28 (38%) nursing staff were aware that hand washing with soap and water is the most effective way of preventing transmission of C. difficile infection. Results showed that 93% of trainees, 78% of consultants (P = 0.05) and 70% of nurses correctly answered that oral metronidazole is the drug of choice for the treatment of C. difficile infection. Compared to 73% of trainees, only two (11%) consultants (P < 0.0001) and 20 (27%) nursing staff correctly stated that oral vancomycin is the second-line treatment for persistent symptomatic C. difficile infection. CONCLUSIONS: There is a significant lack of knowledge concerning C. difficile infection amongst healthcare professions, in particular amongst consultants and nurses in our hospital.