“Head lice, Pediculus humanus capitis, are obligate blood-sucking parasites. Phylogenetically, they occur in five divergent mitochondrial clades (A, D, B, C and E), each having a particular geographical distribution. Recent studies have revealed that head lice, as is the case of body lice, can act as a vector for louse-borne diseases. Here, we aimed to study the genetic diversity of head lice collected from Niger’s refugees (migrant population) arriving in Algeria, northern Africa, and to look for louse-borne pathogens. Comparative head lice samples collected from indigenous population of schoolchildren (non-immigrant) were also analyzed to frame the study.” Parasit Vectors. 2018 Jun 15. See full article: Detection of bacterial pathogens in clade E head lice collected from Niger’s …
NPA Urges the US Food and Drug Administration to Recognize Safer Head Lice Treatment Choices
The National Pediculosis Association® (NPA) has submitted a petition to the US Food and Drug Administration (FDA) requesting that it update its website and other educational materials so that combing with well-designed nit-removal combs like the LiceMeister® is presented as a safe and effective option for the treatment of children with head lice. Doing so would give more parents access to the critical information and guidance necessary to make informed decisions. There are many children for whom a non-chemical treatment for lice is required. Read full release. | Read the petition. | Read the FDA's acknowledgement of the petition. The NPA’s petition is consistent with the FDA’s goal to empower consumers and patients to make informed and effective health decisions, as stated by …
Molecular Survey of Head and Body Lice, Pediculus humanus, in France
“Human lice, Pediculus humanus, are obligate blood-sucking parasites. Phylogenetically, they belong to several mitochondrial clades exhibiting some geographic differences. Currently, the body louse is the only recognized disease vector, with the head louse being proposed as an additional vector. In this article, we study the genetic diversity of head and body lice collected from Bobigny, a town located close to Paris (France), and look for louse-borne pathogens.” Vector Borne Zoonotic Dis. 2018 May. See full article: "Molecular Survey of Head and Body Lice, Pediculus humanus, in France." …
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Body lice of homeless people reveal the presence of several emerging bacterial pathogens in northern Algeria
“Recently, head lice belonging to different mitochondrial clades were found to carry the DNA of several bacterial body louse-borne pathogens, such as B. quintana, B. recurrentis, Acinetobacter species and Y. pestis in natural settings [14,16,20,33±38]. Experimental studies have also demonstrated that head lice may also act as a vector of louse-borne diseases” PLoS Negl Trop Dis. 2018 Apr 17. See full article: "Body lice of homeless people reveal the presence of several emerging bacterial pathogens in northern Algeria." …
A Better Picture of Head-Lice Transmission, Aided by Math and a Fine-Toothed Comb
"As evidence mounts that head lice are developing resistance to widely used insecticides, the fight against lice is helped by a better understanding of how they spread—and how to stop them. Controlled studies of transmission of head lice (Pediculus humanus capitis) in real-world settings aren’t exactly feasible, though, because the most accurate investigation would require somehow tracking the detailed movements of, say, a classroom full of children as well as the individual lice those children might be carrying. So, researchers must find different ways to get at the same kind of information." See full article at Entomology Today. …
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Insights About Head Lice Transmission From Field Data and Mathematical Modeling
“Head lice infest millions of school-age children every year, both in developed and developing countries. However, little is known about the number of lice transferred among children during school activities, because direct methods to study this are almost impossible to implement. This issue has been addressed following an indirect method, which consist in collecting data of real infestation from several children groups and using a mathematical model of lice colonies to infer how the infestation observed might have evolved. By determining the events that would most likely lead to infestations as those observed, we find that severe infestations are most likely initiated by a relatively large number of lice transferred at the same moment or within relatively short time spans. In turn, …
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Response of Pediculus humanus capitis (Phthiraptera: Pediculidae) to Volatiles of Whole and Individual Components of the Human Scalp
“The head louse Pediculus humanus capitis (De Geer) (Phthiraptera: Pediculidae) is a cosmopolitan human ectoparasite causing pediculosis, one of the most common arthropod parasitic conditions of humans. The mechanisms and/or chemicals involved in host environment recognition by head lice are still unknown. In this study, we evaluated the response of head lice to volatiles that emanate from the human scalp. In addition, we identified the volatile components of the odor and evaluated the attractive or repellent activity of their pure main components. The volatiles were collected by means of Solid Phase microextraction and the extract obtained was chemically analyzed by gas chromatograph-mass spectrometer. Twenty-four volatile were identified in the human scalp odor, with the main …