Exploring barriers to 'Respondent driven sampling' in sex worker and drug-injecting sex worker populations in Eastern Europe

Respondent driven sampling (RDS) has been used in several counties to sample injecting drug users, sex workers (SWs) and men who have sex with men and as a means of collecting behavioural and biological health data. We report on the use of RDS in three separate studies conducted among SWs between 2004 and 2005 in the Russian Federation, Serbia, and Montenegro. Findings suggest that there are limitations associated with the use of RDS in SW populations in these regions. Findings highlight three main factors that merit further investigation as a means of assessing the feasibility and appropriateness of RDS in this high risk population: the network characteristics of SWs; the appropriate level of participant incentives; and lack of service contact. The highly controlled and hidden nature of SW organizations and weak SW social networks in the region can combine to undermine assumptions underpinning the feasibility of RDS approaches and potentially severely limit recruitment. We discuss the implications of these findings for recruitment and the use of monetary and non-monetary incentives in future RDS studies of SW populations in Eastern Europe

Language Profile and Performances on Math Assessments for Children with Mild Intellectual Disabilities

It has been assumed that mathematics testing indicates the development of mathematics concepts, but the linguistic demands of assessment have not been evaluated, especially for children with mild intellectual disabilities. 244 children (grades 2 – 5) were recruited from a larger reading intervention study. Using a multilevel longitudinal SEM model, baseline and post-intervention time points were examined for the contribution of item linguistic complexity, child language skills, and their potential interaction in predicting item level mathematics assessment performance. Item linguistic complexity was an important, stable, and negative predictor of mathematics achievement with children’s language skills significantly and positively predicting mathematics achievement. The interaction between item linguistic complexity and language skills was significant though not stable across time. Following intervention, children with higher language skills performed better on linguistically complex mathematics items. Mathematics achievement may be related to an interaction between children’s language skills and the linguistic demands of the tests themselves

Problematising the emergence of outbreak science in the governance of global health: making time for slow dis-ease

There is growing investment in the development of new methods, networks, and infrastructures of knowledge coordination to prepare for disease threats to come. ‘Outbreak science’ is an emerging field that proposes to improve epidemic preparedness and precautionary response. But what are the effects of framing and governing ‘outbreaks’ in this anticipatory mode? What ways of knowing and doing preparedness and response does outbreak science open up and foreclose through its promise of fast, actionable information in situations of uncertainty? We consider how ‘outbreak’ is made governable through its evidencing, with profound, and unevenly distributed, social and material repercussions. We focus on one problematisation intrinsic to outbreak science, that is, the need for speed. Drawing on work in Science and Technology Studies (STS) on pollutants and the slow burn of environmental harms, we argue that constituting ‘outbreak’ as a problem to be managed with immediacy and speed obscures the long-enduring temporalities and complex ecological relations of disease. We suggest ‘slow dis-ease’ in conjunction with ‘perpetual care’ as alternative modes of problematising outbreak. There is a practical difference made possible by making time for slow dis-ease, a time that is currently lost by the rapid, anticipation and short-term event focus of outbreak science

Observations of lightning processes using VHF radio interferometry

A single station, multiple baseline radio interferometer was used to locate the direction of VHF radiation from lightning discharges with microsec time resolution. Radiation source directions and electric field waveforms were analyzed for various types of breakdown events. These include initial breakdown and K type events of in-cloud activity, and the leaders of initial and subsequent strokes to ground and activity during and following return strokes. Radiation during the initial breakdown of a flash and in the early stages of initial leaders to ground is found to be similar. In both instances, the activity consists of localized bursts of radiation that are intense and slow moving. Motion within a given burst is unresolved by the interferometer. Radiation from in-cloud K type events is essentially the same as that from dart leaders; in both cases it is produced at the leading edge of a fast moving streamer that propagates along a well defined, often extensive path. K type events are sometimes terminated by fast field changes that are similar to the return stroke initiated by dart leaders; such K type events are the in-cloud analog of the dart leader return stroke process