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Do drowning and anoxia kill head lice?
Parasite. 2018; 25:8.P

Abstract

Chemical, physical, and mechanical methods are used to control human lice. Attempts have been made to eradicate head lice Pediculus humanus capitis by hot air, soaking in various fluids or asphyxiation using occlusive treatments. In this study, we assessed the maximum time that head lice can survive anoxia (oxygen deprivation) and their ability to survive prolonged water immersion. We also observed the ingress of fluids across louse tracheae and spiracle characteristics contrasting with those described in the literature. We showed that 100% of lice can withstand 8 h of anoxia and 12.2% survived 14 h of anoxia; survival was 48.9% in the untreated control group at 14 h. However, all lice had died following 16 h of anoxia. In contrast, the survival rate of water-immersed lice was significantly higher when compared with non-immersed lice after 6 h (100% vs. 76.6%, p = 0.0037), and 24 h (50.9% vs. 15.9%, p = 0.0003). Although water-immersed lice did not close their spiracles, water did not penetrate into the respiratory system. In contrast, immersion in colored dimeticone/cyclomethicone or colored ethanol resulted in penetration through the spiracles and spreading to the entire respiratory system within 30 min, leading to death in 100% of the lice.

Authors+Show Affiliations

Parasitology-Mycology Department, Avicenne Hospital, AP-HP, Bobigny, France - Unité des Virus Emergents (Aix-Marseille Univ - IRD 190 - Inserm 1207 - IHU Méditerranée infection), Marseille, France.Parasitology-Mycology Department, Avicenne Hospital, AP-HP, Bobigny, France.Unit of Pharmacology, Avicenne Hospital, AP-HP, Bobigny, France.Parasitology-Mycology Department, Avicenne Hospital, AP-HP, Bobigny, France.Unité des Virus Emergents (Aix-Marseille Univ - IRD 190 - Inserm 1207 - IHU Méditerranée infection), Marseille, France.Parasitology-Mycology Department, Avicenne Hospital, AP-HP, Bobigny, France - Unité des Virus Emergents (Aix-Marseille Univ - IRD 190 - Inserm 1207 - IHU Méditerranée infection), Marseille, France.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29521258

Citation

Candy, Kerdalidec, et al. "Do Drowning and Anoxia Kill Head Lice?" Parasite (Paris, France), vol. 25, 2018, p. 8.
Candy K, Brun S, Nicolas P, et al. Do drowning and anoxia kill head lice? Parasite. 2018;25:8.
Candy, K., Brun, S., Nicolas, P., Durand, R., Charrel, R. N., & Izri, A. (2018). Do drowning and anoxia kill head lice? Parasite (Paris, France), 25, 8. https://doi.org/10.1051/parasite/2018015
Candy K, et al. Do Drowning and Anoxia Kill Head Lice. Parasite. 2018;25:8. PubMed PMID: 29521258.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Do drowning and anoxia kill head lice? AU - Candy,Kerdalidec, AU - Brun,Sophie, AU - Nicolas,Patrick, AU - Durand,Rémy, AU - Charrel,Remi N, AU - Izri,Arezki, Y1 - 2018/03/09/ PY - 2017/08/31/received PY - 2018/02/25/accepted PY - 2018/3/10/entrez PY - 2018/3/10/pubmed PY - 2018/11/15/medline SP - 8 EP - 8 JF - Parasite (Paris, France) JO - Parasite VL - 25 N2 - Chemical, physical, and mechanical methods are used to control human lice. Attempts have been made to eradicate head lice Pediculus humanus capitis by hot air, soaking in various fluids or asphyxiation using occlusive treatments. In this study, we assessed the maximum time that head lice can survive anoxia (oxygen deprivation) and their ability to survive prolonged water immersion. We also observed the ingress of fluids across louse tracheae and spiracle characteristics contrasting with those described in the literature. We showed that 100% of lice can withstand 8 h of anoxia and 12.2% survived 14 h of anoxia; survival was 48.9% in the untreated control group at 14 h. However, all lice had died following 16 h of anoxia. In contrast, the survival rate of water-immersed lice was significantly higher when compared with non-immersed lice after 6 h (100% vs. 76.6%, p = 0.0037), and 24 h (50.9% vs. 15.9%, p = 0.0003). Although water-immersed lice did not close their spiracles, water did not penetrate into the respiratory system. In contrast, immersion in colored dimeticone/cyclomethicone or colored ethanol resulted in penetration through the spiracles and spreading to the entire respiratory system within 30 min, leading to death in 100% of the lice. SN - 1776-1042 UR - https://www.unboundmedicine.com/medline/citation/29521258/Do_drowning_and_anoxia_kill_head_lice L2 - http://publications.edpsciences.org/10.1051/parasite/2018015 DB - PRIME DP - Unbound Medicine ER -