Abstract
Head lice are an emerging social problem, not only in economically poor countries but also in practically all other societies. Several of the common anti-louse products have lost—at least in part—their efficacy due to increasing resistance of lice against insecticides such as permethrin or allethrin. Other compounds, like lindan, were redrawn or banned due to high toxicity. Some recently developed products are based on dimethicones or cyclomethicones and turned out to be easily inflammable. Other styled medicinal products are based on plant extracts—some were proven of high efficacy—others of ineffectivity. The present study investigated in in vitro tests the anti-head louse efficacy of 13 products, the contents of which are used worldwide: Aesculo®-Gel L, EtoPril®, Goldgeist® Forte, InfectoPedicul®, Jacutin® Pedicul Fluid, K.Laus®, Liberalice®, Licatack®, Mosquito® Läuse-Shampoo, Nyda®, Paranix®, Picksan® Louse Stop, and Wash Away Louse®. It turned out that several of them are easily inflammable, and therefore, they endanger users (InfectoPedicul®, Paranix®, EtoPril®, Nyda®, Goldgeist® Forte, and K.Laus®, see Table 1). Others have to remain for many hours on the hair in order to reach efficacy (Table 4). During such long periods, highly dosed oils may become inhaled and thus may become dangerous for the user's lung epithelia by covering them. When incubating the lice for 3 or 10 min in vitro, only the following products killed all lice exposed to these products: InfectoPedicul®, Paranix®, Jacutin® Pedicul Fluid, Nyda®, K.Laus®, Picksan® Louse Stop, Licatack®, and Wash Away Louse®. When evaluating the possible dangers for the users, the last three products, especially, derived from plant extracts, are safe and highly effective at the same time. Furthermore, they had been tested dermatologically as “very good”.
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References
Abdel-Ghaffar F, Semmler M (2007) Efficacy of neem seed extract shampoo on head lice of naturally infected human in Egypt. Parasitol Res 100:329–332
Aspöck H, Walochnik J (2007) Die Parasiten des Menschen aus der Sicht der Ko-Evulotion. Denisia 20:149–254
Burgess IF (2004) Human lice and their control. Annuv Rev Entomol 49:475–481
Burgess IF (2009) Current treatments for Pediculosis capitis. Curr Opin Infect Dis 22:131–136
Falagas M, Matthaiou D, Rafailidis P, Panos G, Pappas G (2008) Worldwide prevalence of head lice. Emerg Infect Dis 14:1493–1494
Heukelbach J, Speare R, Canyon D (2006a) Natural products and their application to the control of head lice: an evidence-based review. In: Brahmachari G (ed) Chemistry of natural products: recent trends and developments. Kerala, India, pp 1–26
Heukelbach J, Oliveira FA, Speare R (2006b) A new shampoo based on neem (Azadirachta indica) is highly effective against head lice in vitro. Parasitol Res 99:353–356
Mehlhorn H (ed) (2008) Encyclopedia of parasitology. Springer, New York
Mehlhorn B, Mehlhorn H (2009) Louse alarm. Düsseldorf University Press, Düsseldorf
Mehlhorn H, Eichenlaub D, Löscher T, Peters W (1995) Diagnosis and therapy of human parasites. 2nd edition, G. Fischer, Stuttgart
Mogabure Cueto G, Zerba E, Picollo MI (2008) Evidence of pyrethroid resistance in eggs of Pediculus humanus capitis (Phthiraptera: Pediculidae) from Argentina. J Med Entomol 45:693–697
Mumcuoglu Y, Rufli T (1983) Dermatologische Entomologie. Perimed, Erlangen
Mumucuoglu Y, Gilead L, Ingber A (2009) New insights in pediculosis and scabies. Expert Review Dermatol 4:285–302
Nair B (2003) Cosmetic ingredients review expert panel—final report on safety assessments. Int J Toxicol 22(2):11–35
Oliveira FA, Speare R, Heukelbach J (2007) High in-vitro efficacy of Nyda® L, a pediculicide containing dimethicone. J Eur Acad Dermatol Venerol 21:1325–1329
Picollo MI, Vassena C, Mougabure Cueto G, Vernitti M, Zerba E (2000) Resistance to insecticides and effects of synergists on permethrin toxicity in Pediculus capitis (Anoplura: Pediculidae) from Buenos Aires. J Med Entomol 37:721–725
Vassena CV, Mougabure Cueto G, González Audino P, Alzogaray R, Zerba E, Picollo MI (2003) Prevalence and levels of permethrin resistance in Pediculus humanus capitis De Geer (Anoplura: Pediculidae) from Buenos Aires, Argentina. J Med Entomol 40:477–450
Acknowledgement
We thank the mothers of the children in the Egyptian village for their kind help to deliver large numbers of lice of any stage of development. This study was in parts supported by the Center of Excellence of the College of Science of the King Saud University at Riyadh, Saudi Arabia.
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Abdel-Ghaffar, F., Semmler, M., Al-Rasheid, K. et al. Comparative in vitro tests on the efficacy and safety of 13 anti-head-lice products. Parasitol Res 106, 423–429 (2010). https://doi.org/10.1007/s00436-009-1680-x
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DOI: https://doi.org/10.1007/s00436-009-1680-x