Suchergebnisse

FrontMatter -- Reviewers -- Contents -- Preface -- Summary -- 1 Introduction -- 2 Hurricane Katrina: Challenges, Concerns, Policies, and Needs -- 3 Hurricane Katrina: Challenges for the Community -- 4 Nature and Extent of Environmental Exposures -- 5 Health Monitoring, Assessment, and Response -- 6 Community Involvement in Response to Disasters -- 7 Research to Address Gaps in Environmental Health Assessments During Disasters -- 8 Moving Forward -- References -- Appendixes -- Appendix A Workshop Agenda -- Appendix B Speakers and Panelists -- Appendix C Workshop Participants.

Modern biotechnology has dramatically increased our ability to alter the agronomic traits of plants. Among the novel traits that biotechnology has made available, an important group includes Bacillus thuringiensis-derived insect resistance. This technology has been applied to potatoes, cotton, and corn. Benefits of Bt crops, and biotechnology generally, can be realized only if risks are assessed and managed properly. The case of Starlink corn, a plant modified with a gene that encodes the Bt protein Cry9c, was a severe test of U.S. regulatory agencies. The U.S. Environmental Protection Agency had restricted its use to animal feed due to concern about the potential for allergenicity. However, Starlink corn was later found throughout the human food supply, resulting in food recalls by the Food and Drug Administration and significant disruption of the food supply. Here we examine the regulatory history of Starlink, the assessment framework employed by the U.S. government, assumptions and information gaps, and the key elements of government efforts to manage the product. We explore the impacts on regulations, science, and society and conclude that only significant advances in our understanding of food allergies and improvements in monitoring and enforcement will avoid similar events in the future. Specifically, we need to develop a stronger fundamental basis for predicting allergic sensitization and reactions if novel proteins are to be introduced in this fashion. Mechanisms are needed to assure that worker and community aeroallergen risks are considered. Requirements are needed for the development of valid assays so that enforcement and post market surveillance activities can be conducted.

FrontMatter -- Reviewers -- Preface -- Contents -- Summary -- Workshop Objectives and Charge to Participants -- Introduction -- 1 Bridging the Chasm Between Health and the Environment: Science and Policy Context -- 2 Overview of Environmental Health Monitoring and the Use of Indicators -- 3 Environmental Health Monitoring at the Federal Level -- 4 Needed Integration of Other Federal Agencies, State Agencies, and Nongovernmental Organizations to Build a Monitoring System -- 5 The Challenges Ahead -- Abstracts -- References -- Appendixes -- Appendix A Workshop Agenda -- Appendix B Speakers and Panelists -- Appendix C Workshop Participants.

Technology has improved the food supply since the first cultivation of crops. Genetic engineering facilitates the transfer of genes among organisms. Generally, only minute amounts of a specific protein need to be expressed to obtain the desired trait. Food allergy affects only individuals with an abnormal immunologic response to food--6% of children and 1.5-2% of adults in the United States. Not all diseases caused by food allergy are mediated by IgE. A number of expert committees have advised the U.S. government and international organizations on risk assessment for allergenicity of food proteins. These committees have created decision trees largely based on assessment of IgE-mediated food allergenicity. Difficulties include the limited availability of allergen-specific IgE antisera from allergic persons as validated source material, the utility of specific IgE assays, limited characterization of food proteins, cross-reactivity between food and other allergens, and modifications of food proteins by processing. StarLink was a corn variety modified to produce a (Italic)Bacillus thuringiensis(/Italic) (Bt) endotoxin, Cry9C. The Centers for Disease Control and Prevention investigated 51 reports of possible adverse reactions to corn that occurred after the announcement that StarLink, allowed for animal feed, was found in the human food supply. Allergic reactions were not confirmed, but tools for postmarket assessment were limited. Workers in agricultural and food preparation facilities have potential inhalation exposure to plant dusts and flours. In 1999, researchers found that migrant health workers can become sensitized to certain Bt spore extracts after exposure to Bt spraying.

Pesticide manufacturers have tested pesticides increasingly in human volunteers over the past decade. The apparent goal of these human studies is to establish threshold levels for symptoms, termed "no observed effect levels." Data from these studies have been submitted to the U.S. Environmental Protection Agency (EPA) for consideration in standard setting. There are no required ethical guidelines for studies of pesticides toxicity conducted in humans, no governmental oversight is exercised, and no procedures have been put in place for the protection of human subjects. To examine ethical and policy issues involved in the testing of pesticides in humans and the use of human data in standard setting, in February 2002 the Center for Children's Health and the Environment of the Mount Sinai School of Medicine convened an expert workshop for ethicists, physicians, toxicologists, and policy analysts. After a peer consensus process, participants developed a number of ethical and public policy recommendations regarding the testing of pesticides in humans. Participants also strongly encouraged active biomonitoring of every pesticide currently in use to track human exposure, particularly in vulnerable populations, and to assess adverse effects on health.

The UK is well into the second wave of COVID-19, with 60 051 lives lost to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection to date, according to provisional data from the Office for National Statistics. Official UK Government data show that cases have been rising exponentially since late August, 2020, with increases across all regions in England in recent weeks. As of Nov 4, 2020, the UK had 25 177 confirmed daily cases. These are almost certainly underestimates as between Oct 17 and Oct 23, 2020, England alone had 52 000 estimated daily cases. Estimates of the effective reproduction number in England vary between 1.1 and 1.6. Daily deaths have doubled every fortnight since early September, 2020, with 2067 deaths from COVID-19 in the past week and around 12 000 deaths more are likely in the next month—the majority among people who have already been infected. With 12 000 patients currently in hospital with COVID-19, health services are close to capacity in many regions. We are seeing more than 1400 daily hospital admissions in England, a single doubling period away from the peak of 3000 daily admissions that occurred in April, 2020, which could be reached within 2–3 weeks.