Variable bites and dynamic populations; new insights in Leishmania transmission.

Leishmaniasis is a neglected tropical disease which kills an estimated 50,000 people each year, with its deadly impact confined mainly to lower to middle income countries. Leishmania parasites are transmitted to human hosts by sand fly vectors during blood feeding. Recent experimental work shows that transmission is modulated by the patchy landscape of infection in the host's skin, and the parasite population dynamics within the vector. Here we assimilate these new findings into a simple probabilistic model for disease transmission which replicates recent experimental results, and assesses their relative importance. The results of subsequent simulations, describing random parasite uptake and dynamics across multiple blood meals, show that skin heterogeneity is important for transmission by short-lived flies, but that for longer-lived flies with multiple bites the population dynamics within the vector dominate transmission probability. Our results indicate that efforts to reduce fly lifespan beneath a threshold of around two weeks may be especially helpful in reducing disease transmission.

How do people seeking asylum in the United Kingdom conceptualize and cope with the asylum journey?

People seeking asylum experience traumatic events and psychological difficulties in country-of-origin, in 'flight', and during re-settlement. Research with this population has focussed on using quantitative methods to examine psychopathology from exposure to traumatic events, and there is a paucity of qualitative research exploring subjective experiences of this population throughout their asylum journey. Few studies have examined ways asylum seekers might cope with such events. This study aimed to address this gap by employing Constructivist Grounded Theory to understand the ways people seeking asylum conceptualize and cope with their experiences across the asylum process. Semi-structured interviews were conducted with eleven people seeking asylum accessing a third sector mental health project and/or primary-care health service. Four main themes emerged from the data: 'Before Asylum', 'Displacement', 'Identity in the UK' and 'Reflections on the Future'. The stress of the asylum system and adaptation to new environments are core aspects of the theory, along with an exploration of how people cope with these circumstances, via internal psychological strategies and external support sources. Prior experiences (including the development of 'inner strength') impacted upon how participants conceptualized their everyday experiences, and this shaped their considerations for the future. Service implications are discussed.

High levels of mortality, exposure to violence and psychological distress experienced by the internally displaced population of Ein Issa camp prior to and during their displacement in Northeast Syria, November 2017.

BACKGROUND: War in Syria has lasted for more than eight years, causing population displacement, collapse of medical and public health services, extensive violence and countless deaths. Since November 2016, military operations in Northeast Syria intensified. In October 2017 a large influx of internally displaced persons (IDPs) arrived to Ein Issa camp, Raqqa governate. Médecins Sans Frontières (MSF) assessed the health status of recently arrived IDPs in Ein Issa camp. METHODS: MSF carried out a cross-sectional survey using simple random sampling between 8 and 18 November 2017, enrolling households who had arrived to Ein Issa camp since 1 October 2017. A questionnaire collected data on demographics, history of displacement, retrospective one-year mortality, two-week morbidities, non-communicable diseases, exposure to violence in the last year and two-week psychological distress symptoms among all household members as well as vaccination status in children aged 6 to 59 months. The latter were also screened for malnutrition. Prevalence estimates and mortality rates were calculated with their 95% confidence interval. Mortality rates were calculated as the number of deaths/10,000 persons/day using the individual person-day contribution of all household members. RESULTS: MSF surveyed 257 households (1482 participants). They reported 31 deaths in the previous year, resulting in a crude mortality rate of 0.56 deaths/10,000 persons/day (95%CI: 0.39-0.80). Conflict-related violence was the most frequently reported cause of death (64.5%). In the previous year, 31.7% (95%CI: 29.4-34.2) of the participants experienced at least one violent episode. The most frequent type of violence reported was witnessing atrocities (floggings, executions or public body displays); 18.9% (95%CI: 17.0-21.0) of the population and 9.8% (95%CI: 7.9-12.0) of the children under 15 years had witnessed such atrocities. In men over 14 years, 15.8% (95%CI: 11.9-20.8) were detained/kidnapped and 11.3% (95%CI: 8.0-15.8) tortured/beaten/attacked. In the two weeks prior to interview, 14.4% (95%CI: 10.6-19.3) of the respondents felt so hopeless that they did not want to carry on living most of the time. CONCLUSIONS: High levels of mortality, exposure to violence and psychological distress were reported. These survey results increase understanding of the impact of the conflict on the IDP population in Northeast Syria.

In their own words: a synthesis of the qualitative research on the experiences of adults seeking asylum. A systematic review of qualitative findings in forced migration.

Quantitative research indicates that some forced migrants have mental health needs. Asylum seekers are a group of forced migrants applying for asylum status in a host country, and are often subject to rights restrictions and threat of deportation, though little is known about subjective experiences of the asylum journey and process of claiming asylum. The current paper therefore describes a systematic review of the qualitative literature, examining asylum seekers experiences of asylum journey, from country of origin, to arrival and adaptation to host countries. A search of four databases yielded 122 studies. Inclusion/exclusion criteria were applied and 15 studies were retained and critically appraised. The country where research was conducted, study aims, sample characteristics and methodological approaches were all critically reviewed for included studies. Study aims fell into four themes; 'an aspect of the asylum seeker journey'; 'psychological distress and wellbeing'; 'cultural identity and adaptation to new environment' and 'social welfare, employment and housing'. Studies were generally high quality and indicate issues around choice of asylum destination, distress created by uncertainty around asylum decision and hostile reactions of host communities. However, few studies have examined the experiences of asylum seekers specifically, which is important given the unique circumstances of this population.

Empathy and aggression: two faces of ecstasy? A study of interpretative cognitive bias and mood change in ecstasy users.

RATIONALE: As central 5-hydroxytryptamine (5-HT) is attenuated for a period following a single dose of MDMA ("ecstasy") and low 5-HT is associated with aggression, then MDMA users may be more aggressive in the days following an acute dose of the drug. OBJECTIVE: This study therefore aimed to determine if acute use of MDMA is associated with aggression 4 and 7 days later. METHODS: Twenty-nine MDMA users and 32 controls were compared on self-rated aggression and depression on the night of drug use (day 0), 4 and 7 days later. On day 4, participants performed an interpretative bias task in which they processed ambiguous sentences that could be interpreted in either an aggressive or neutral way (e.g. "The painter drew the knife"). RESULTS: MDMA users had faster response times in completing ambiguous aggressive sentences than neutral sentences; controls showed the opposite pattern of performance. In a subsequent recognition task, MDMA users were more confident in judging, and responded faster to, aggressive than neutral sentences; controls again showed the opposite pattern of effects. The level of aggressive interpretative bias positively correlated with extent of MDMA use. Midweek, MDMA users had higher self-rated aggression and depression scores than controls; on day 7, scores of both groups were similar. CONCLUSIONS: MDMA users display a cognitive bias towards interpreting ambiguous information in an aggressive way a few days after taking the drug. Self-rated mid-week low mood and mid-week aggression do not persist 7 days after use of the drug. This pattern of results is consistent both with the acute and residual effects of MDMA on central 5-HT and with the notion that 5-HT plays a role in modulating human aggression.