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How to sell a poison : the rise, fall, and toxic return of DDT
\"In the 1940s, DDT helped the Allies win the Second World War by wiping out the insects that caused malaria, with seemingly no ill effects on humans. After the war, it was sprayed willy-nilly across fields, in dairy barns, and even in people's homes, leaving environmental and human devastation in its wake across the globe, particularly in communities of color. Thirty years later the U.S. would ban the use of DDT--only to reverse the ban in the 1990s when calls arose to bring it back to fight West Nile and malaria. What happened? How to Sell a Poison traces the surprising history of DDT in parallel to the story of a predominantly Black town poisoned by a neighboring DDT plant. Historian Elena Conis reveals new evidence that it was not the shift in public opinion following Silent Spring's publication that led to the ban so much as the behind-the-scenes political machinations of Big Business. She argues that we've been missing the lesson of this cautionary tale and the harm caused by DDT is a symptom of a larger problem: the prioritization of profits over public health. If we don't change our approach, Conis argues, we're doomed to keep making the same mistakes and putting people--particularly the most vulnerable--at risk, both by withholding technologies that could help them and by exposing them to dangerous chemicals without their consent. In an age when corporations and politicians are shaping our world behind closed doors and deliberately stoking misinformation around public health issues, from vaccines to climate change to COVID-19, we need greater transparency and a new way of communicating about science--as a discipline of discovery that's constantly evolving, rather than a finite and immutable collection of facts--in order to restore public trust and protect ourselves and our environment.\"-- Provided by publisher
BOOK
Comparative functional survival and equivalent annual cost of 3 long-lasting insecticidal net (LLIN) products in Tanzania: A randomised trial with 3-year follow up
Two billion long-lasting insecticidal nets (LLINs) have been procured for malaria control. A functional LLIN is one that is present, is in good physical condition, and remains insecticidal, thereby providing protection against vector-borne diseases through preventing bites and killing disease vectors. The World Health Organization (WHO) prequalifies LLINs that remain adequately insecticidal 3 years after deployment. Therefore, institutional buyers often assume that prequalified LLINs are functionally identical with a 3-year lifespan. We measured the lifespans of 3 LLIN products, and calculated their cost per year of functional life, to demonstrate the economic and public health importance of procuring the most cost-effective LLIN product based on its lifespan.
A randomised double-blinded trial of 3 pyrethroid LLIN products (10,571 nets in total) was conducted at 3 follow-up points: 10 months (August-October 2014), 22 months (August-October 2015), and 36 months (October-December 2016) among 3,393 households in Tanzania using WHO-recommended methods. Primary outcome was LLIN functional survival (LLIN present and in serviceable condition). Secondary outcomes were (1) bioefficacy and chemical content (residual insecticidal activity) and (2) protective efficacy for volunteers sleeping under the LLINs (bite reduction and mosquitoes killed). Median LLIN functional survival was significantly different between the 3 net products (p = 0.001): 2.0 years (95% CI 1.7-2.3) for Olyset, 2.5 years (95% CI 2.2-2.8) for PermaNet 2.0 (hazard ratio [HR] 0.73 [95% CI 0.64-0.85], p = 0.001), and 2.6 years (95% CI 2.3-2.8) for NetProtect (HR = 0.70 [95% CI 0.62-0.77], p < 0.001). Functional survival was affected by accumulation of holes, leading to users discarding nets. Protective efficacy also significantly differed between products as they aged. Equivalent annual cost varied between US$1.2 (95% CI $1.1-$1.4) and US$1.5 (95% CI $1.3-$1.7), assuming that each net was priced identically at US$3. The 2 longer-lived nets (PermaNet and NetProtect) were 20% cheaper than the shorter-lived product (Olyset). The trial was limited to only the most widely sold LLINs in Tanzania. Functional survival varies by country, so the single country setting is a limitation.
These results suggest that LLIN functional survival is less than 3 years and differs substantially between products, and these differences strongly influence LLIN value for money. LLIN tendering processes should consider local expectations of cost per year of functional life and not unit price. As new LLIN products come on the market, especially those with new insecticides, it will be imperative to monitor their comparative durability to ensure that the most cost-effective products are procured for malaria control.
Journal Article
Seasonal activity of Trechnites insidiosus in pear
Cacopsylla pyricola (Forster) (Hemiptera: Psyllidae) is the most expensive and challenging insect pest of commercial pear trees in the Pacific Northwest. Integrated pest management (IPM) programs are working toward relying more heavily on natural enemies to reduce insecticide use. Trechnites insidiosus (Crawford) (Hymenoptera: Encyrtidae) is the main parasitoid of C. pyricola, but little is known about its biology in the region. Developing sampling tools is important for the deployment of IPM programs, including monitoring of natural enemies. In this study, we examined 2 conventional monitoring methods: beat trays and yellow sticky cards, in addition to screened sticky cards and 3D-printed cylinder traps. Additionally, we tested an overwintering trap for the collection of parasitized C. pyricola. The trapping methods were tested in orchards in Oregon and Washington. Unscreened cards caught the most T. insidiosus and C. pyricola, followed by screened cards, cylinder traps, and then beat trays. Beat trays sometimes failed to catch any T. insidiosus, even when it was found in abundance via other methods. Screened cards and cylinder traps reduced bycatch and increased ease of identifying T. insidiosus. Specimens from the cylinder traps were also more suitable for use in molecular analysis. The overwintering traps were effective at capturing parasitized C. pyricola, but were highly variable year to year. The ideal trapping method will vary based on research needs (e.g., DNA preservation, reducing bycatch, catching higher numbers), but both screened sticky cards and cylinder traps were viable methods for monitoring T. insidiosus and its host. Key words: parasitoid, pear psylla, monitoring, insect trap, 3D-printing
Journal Article
DDT and the American century : global health, environmental politics, and the pesticide that changed the world
In DDT and the American Century, David Kinkela chronicles the use of DDT around the world from 1941 to the present with a particular focus on the United States, which has played a critical role in encouraging the global use of the pesticide. The banning of DDT in the United States in 1972 is generally regarded as a signal triumph for the American environmental movement. Yet DDT's function as a tool of U.S. foreign policy and its use in international development projects designed to solve problems of disease and famine made it an integral component of the so-called American Century.--[book cover]
Book
Increased Repellent Effect of DEET on Aedes aegypti
Insecticides and repellents are routinely used in Brazil because of the high rates of arbovirus transmission and the nuisance caused by mosquitoes. However, few studies have assessed the effectiveness of repellents against mosquito populations that have been under exposure to xenobiotics, mainly insecticides and repellents. This study investigated the sensitivity of a field population of Aedes aegypti (Linnaeus, 1762) from a dengue-endemic area under high insecticide pressure to N,N-diethylmethylbenzamide (DEET), the active ingredient in common repellent products. The field (Laranjeiras, Sergipe, Brazil) and laboratory (Rockefeller) populations were characterized for the presence of the Val1016lle kdr mutation, associated with pyrethroid resistance, and locomotor activity. Repellency bioassays were performed to assess the response of the mosquitoes to human odor by exposing them to 10% DEET applied to the skin in ethanol. Samples from the field population showed higher frequency of the kdr mutation, 21.9% homozygous and 21.9% heterozygous, greater locomotor activity and greater sensitivity to DEET than the laboratory population. These results suggest increased sensitivity to DEET in field populations and a possible interaction between insecticide exposure and sensitivity to DEET.
Journal Article
