Case epidemiology from the first three years of a pilot laboratory-based surveillance system for elevated blood-lead concentrations among children in England, 2014-17: implications for public health action.

BACKGROUND: Children incur lead toxicity even at low blood-lead concentrations (BLCs), and testing in England is opportunistic. We described epidemiology of cases notified to a passive laboratory-based surveillance system (SS), the Lead Poisoning in Children (LPIC) SS to inform opportunities to prevent lead exposure in children in England. METHODS: Surveillance population: children <16 years of age and resident in England during the reporting period September 2014-17. Case definition: children with BLC ≥0.48 µmol/l (10 µg/dl). We extracted case demographic/location data and linked it with laboratory, area-level population and socio-economic status (SES) data. We described case BLCs and calculated age-, gender- and SES-specific notification rates, and age-sex standardised regional notification rates. RESULTS: Between 2014 and 2017 there were 86 newly notified cases, giving an annual average notification rate of 2.76 per million children aged 0-15 years. Regionally, rates varied from 0.36 to 9.89 per million. Rates were highest in the most deprived quintile (5.38 per million), males (3.75 per million) and children aged 1-4 years (5.89 per million). CONCLUSIONS: Males, children aged 1-4 years, and children in deprived areas may be at higher risk, and could be targeted for primary prevention. Varied regional notification rates suggest differences in clinician awareness of lead exposure and risk factors; guidelines standardising the indications for BLC-testing may assist secondary prevention.

The United Kingdom Field Epidemiology Training Programme: meeting programme objectives.

IntroductionMost evaluations of field epidemiology training programmes (FETP) are limited to process measures, but stakeholders may need evidence of impact.ObjectiveTo ascertain if the United Kingdom (UK) FETP met its objectives to: (i) strengthen capacity and provision of national epidemiology services, (ii) develop a network of highly skilled field epidemiologists with a shared sense of purpose working to common standards and (iii) raise the profile of field epidemiology through embedding it into everyday health protection practice.MethodsThe evaluation consisted of: (i) focus groups with training site staff, (ii) individual interviews with stakeholders and (iii) an online survey of FETP fellows and graduates. Findings were synthesised and triangulated across the three evaluation components to identify cross-cutting themes and subthemes.FindingsEight focus groups were undertaken with 38 staff, ten stakeholders were interviewed and 28 (76%) graduates and fellows responded to the survey. Three themes emerged: confidence, application and rigour. FETP was perceived to have contributed to the development, directly and indirectly, of a skilled workforce in field epidemiology, increasing stakeholders' confidence in the service. Graduates applied their learning in practice, collaborating with a wide range of disciplines. Fellows and graduates demonstrated rigour by introducing innovations, supporting service improvements and helping supervisors maintain their skills and share good practice.ConclusionThe UK FETP appears to have met its three key objectives, and also had wider organisational impact. FETPs should systematically and prospectively collect information on how they have influenced changes to field epidemiology practice.

Ambient particulate pollution and the world-wide prevalence of asthma, rhinoconjunctivitis and eczema in children: Phase One of the International Study of Asthma and Allergies in Childhood (ISAAC).

OBJECTIVES: To investigate the effect of ambient particulate matter on variation in childhood prevalence of asthma, rhinoconjunctivitis and eczema. METHODS: Prevalences of asthma, rhinoconjunctivitis and eczema obtained in Phase One of the International Study of Asthma and Allergies in Childhood (ISAAC) were matched with city-level estimates of residential PM(10) obtained from a World Bank model. Associations were investigated using binomial regression adjusting for GNP per capita and for clustering within country. For countries with more than one centre, a two stage meta-analysis was carried out. The results were compared with a meta-analysis of published multi-centre studies. RESULTS: Annual concentrations of PM(10) at city level were obtained for 105 ISAAC centres in 51 countries. After controlling for GNP per capita, there was a weak negative association between PM(10) and various outcomes. For severe wheeze in 13-14-year-olds, the OR for a 10 microg/m(3) increase in PM(10) was 0.92 (95% CI 0.84 to 1.00). In 24 countries with more than one centre, most summary estimates for within-country associations were weakly positive. For severe wheeze in 13-14-year-olds, the summary OR for a 10 microg/m(3) increase in PM(10) was 1.01 (0.92 to 1.10). This result was close to a summary OR of 0.99 (0.91 to 1.06) obtained from published multi-centre studies. CONCLUSIONS: Modelled estimates of particulate matter at city level are imprecise and incomplete estimates of personal exposure to ambient air pollutants. Nevertheless, our results together with those of previous multi-centre studies, suggest that urban background PM(10) has little or no association with the prevalence of childhood asthma, rhinoconjunctivitis or eczema either within or between countries.

Training educational supervisors to support physician trainees returning to practice.

Physicians take time out of training for a variety of reasons and, on their return, they often lack confidence and feel 'out of touch'. These trainees require enhanced support and concerns have been raised about trainers' lack of skills and knowledge in this area. A standardised workshop was developed and delivered to address this with a mixed-methods evaluation approach used to analyse data from participants before and after training. Quantitative analysis showed significant pre- to post-course improvements in trainers' ability to understand, explain and manage issues pertaining to trainees taking time out of training. Qualitative analysis yielded three 'learning' themes surrounding knowledge, understanding and awareness of support needed for returning trainees and three 'action' themes surrounding disseminating information, providing resources and actively supporting returning trainees. Framework analysis of follow-up interviews demonstrated not only retention of topics learned but also positive changes in behaviour.

Utility of Whole Genome Sequencing To Describe the Persistence and Evolution of Listeria monocytogenes Strains within Crabmeat Processing Environments Linked to Two Outbreaks of Listeriosis.

This article describes the identification and investigation of two extended outbreaks of listeriosis in which crabmeat was identified as the vehicle of infection. Comparing contemporary and retrospective typing data of Listeria monocytogenes isolates from clinical cases and from food and food processing environments allowed the detection of cases going back several years. This information, combined with the analysis of routinely collected enhanced surveillance data, helped to direct the investigation and identify the vehicle of infection. Retrospective whole genome sequencing (WGS) analysis of isolates provided robust microbiological evidence of links between cases, foods, and the environments in which they were produced and demonstrated that for some cases and foods, identified by fluorescent amplified fragment length polymorphism, the molecular typing method in routine use at the time, were not part of the outbreak. WGS analysis also showed that the strains causing illness had persisted in two food production environments for many years and in one producer had evolved into two strains over a period of around 8 years. This article demonstrates the value of reviewing L. monocytogenes typing data from clinical cases together with that from foods as a means of identifying potential vehicles and sources of infection in outbreaks of listeriosis. It illustrates the importance of reviewing retrospective L. monocytogenes typing alongside enhanced surveillance data to characterize extended outbreaks and inform control measures. Also, this article highlights the advantages of WGS analysis for strain discrimination and clarification of evolutionary relationships that refine outbreak investigations and improve our understanding of L. monocytogenes in the food chain.

A North/South collaboration between two national public health institutes--a model for global health protection.

Rapid international spread of emerging infections has increased interest in strategic collaborations, as they may be the best way to protect populations. Strategic collaborations can build capacity in less-resourced settings. As specialised institutions that provide a stable locus of expertise, continuity of experience, scientific knowledge, and appropriate human, technical, and financial resources, national public health institutes (NPHIs) are well-prepared to tackle public health challenges. We describe how a collaboration between the NPHIs of England and South Africa built a mutually beneficial professional relationship to help implement the WHO International Health Regulations, build capacity for health protection, and promote the exchange of information, advice, and expertise. We illustrate how this can be achieved in a mutually beneficial way.

Screening for carbon monoxide exposure in selected patient groups attending rural and urban emergency departments in England: a prospective observational study.

OBJECTIVES: Carbon monoxide (CO) exposure does not produce a classical toxidrome and so it is thought that it may easily be missed, allowing patients to continue to be exposed to CO. The aim of this study was to determine the proportion of raised carboxyhaemoglobin (COHb) levels in a targeted population of patients presenting to four emergency departments (EDs) in England. DESIGN: A prospective observational study undertaken over a 9-month period. SETTING: Four EDs; one in a rural/suburban area and three serving urban populations. PARTICIPANTS: 1758 patients presenting to the EDs with chest pain, exacerbation of chronic obstructive pulmonary disease (COPD), non-traumatic headache, seizures or flu-like symptoms. MAIN OUTCOME: Measures COHb levels measured using a pulse CO-oximeter or venous sample. Patients with COHb levels ≥2.5% (non-smokers) or ≥5% (smokers) completed a questionnaire assessing potential sources. Patients were defined to be positive for CO exposure if they had a positive COHb and either an identified source or no other reason for their raised level. RESULTS: Proportion of positive patients was: overall-4.3%; COPD-7.5%; headache-6.3%; flu-like-4.3%; chest pain-3.3%; seizures-2.1%. A variety of gas and solid (predominantly charcoal) fossil fuel sources were identified. CONCLUSIONS: This study showed that 4.3% of patients presenting to EDs with non-specific symptoms had unexpectedly raised COHb levels 1.4% of patients had a source of CO identified. Study limitations included non-consecutive recruitment, delays in COHb measurements and a lack of ambient CO measurements, which precludes precise determination of incidence. However, this study should alert clinicians to consider CO exposure in patients presenting with non-specific symptoms, in particular headache and exacerbation of COPD, and if necessary refer patients for suitable public-health follow-up, even in the presence of low COHb readings. Further research should include standardised scene assessments.

The association of self-reported violence at home and health in primary school pupils in West London.

BACKGROUND: The effects of violence upon young people are relatively poorly understood. In 2001 the London Borough of Ealing conducted a large-scale survey of primary school pupils, which included questions on levels of violence at home. The aim of this study was to measure the association of violence at home with measures of health, health care use and health-related behaviours in primary school pupils aged 9 and 11 in West London. METHODS: A total of 3007 pupils from 28 primary schools were given a self-complete health questionnaire; 2083 completed a question on violence at home. RESULTS: Pupils reporting violence were more likely to have needed medical attention in the last year. Violence was also associated with greater need of dental care, drinking and spending money on alcohol, spending money on cigarettes, not eating or drinking before school, less willingness to speak to parents and siblings about drugs, and less communication with teachers about puberty and growing up. Violence was positively associated with increased communication with relatives about puberty. CONCLUSION: Pupils who report violence at home are more likely to have more injuries, riskier health behaviours and less social support than those reporting no violence at home.