Editing DDT (section)

====Insecticides====
{{Main|Indoor residual spraying}}
[[Organophosphate]] and [[carbamate]] insecticides, e.g. [[malathion]] and [[bendiocarb]], respectively, are more expensive than DDT per kilogram and are applied at roughly the same dosage. [[Pyrethroid]]s such as [[deltamethrin]] are also more expensive than DDT, but are applied more sparingly (0.02–0.3&nbsp;g/m<sup>2</sup> vs 1–2&nbsp;g/m<sup>2</sup>), so the net cost per house per treatment is about the same.<ref name="AmJTrop"/> DDT has one of the longest residual efficacy periods of any IRS insecticide, lasting 6 to 12 months. Pyrethroids will remain active for only 4 to 6 months, and organophosphates and carbamates remain active for 2 to 6 months. In many malaria-endemic countries, malaria transmission occurs year-round, meaning that the high expense of conducting a spray campaign (including hiring spray operators, procuring insecticides, and conducting pre-spray outreach campaigns to encourage people to be home and to accept the intervention) will need to occur multiple times per year for these shorter-lasting insecticides.<ref>{{Cite web|url=https://apps.who.int/iris/bitstream/handle/10665/69386/WHO_HTM_MAL_2006.1112_eng.pdf?sequence=1|title=Indoor Residual Spraying|date=2019|website=World Health Organization|access-date=March 14, 2019|archive-date=July 29, 2020|archive-url=https://web.archive.org/web/20200729031424/https://apps.who.int/iris/bitstream/handle/10665/69386/WHO_HTM_MAL_2006.1112_eng.pdf?sequence=1|url-status=live}}</ref>

In 2019, the related compound difluorodiphenyltrichloroethane ([[DFDT]]) was described as a potentially more effective and therefore potentially safer alternative to DDT.<ref>{{cite journal |last1=Zhu |first1=Xiaolong |last2=Hu |first2=Chunhua T. |last3=Yang |first3=Jingxiang |last4=Joyce |first4=Leo A. |last5=Qiu |first5=Mengdi |last6=Ward |first6=Michael D. |last7=Kahr |first7=Bart |title=Manipulating Solid Forms of Contact Insecticides for Infectious Disease Prevention |journal=Journal of the American Chemical Society |volume=141 |issue=42 |pages=16858–16864 |date=11 October 2019 |doi=10.1021/jacs.9b08125|pmid=31601104 |bibcode=2019JAChS.14116858Z |s2cid=204244148 }}</ref><ref name="NYT 17 October 2019">{{cite news |last1=Chang |first1=Kenneth |title=A Nazi Version of DDT Was Forgotten. Could It Help Fight Malaria? |url=https://www.nytimes.com/2019/10/17/science/nazi-ddt-malaria.html |archive-url=https://ghostarchive.org/archive/20220101/https://www.nytimes.com/2019/10/17/science/nazi-ddt-malaria.html |archive-date=2022-01-01 |url-access=limited |access-date=18 October 2019 |work=The New York Times |date=17 October 2019}}{{cbignore}}</ref>