Centers for Disease Control/Division of Parasitic Diseases and Malaria
EOL staff
Life cycle of the Head Louse (Pediculus humanus capitis), an ectparasite of humansThe life cycle of the Head Louse (Pediculis humanus capitis) has three stages: egg, nymph, and adult. Eggs: Nits are Head Lice eggs. They are hard to see and are often mistaken for dandruff or hair spray droplets. Nits are laid by the adult female and are cemented at the base of the hair shaft nearest the scalp (1). They are 0.8 mm by 0.3 mm, oval and usually yellow to white. Nits take about 1 week to hatch (range 6 to 9 days). Viable eggs are usually located within 6 mm of the scalp. Nymphs: The egg hatches to release a nymph (2). The nit shell then becomes a more visible dull yellow and remains attached to the hair shaft. The nymph looks like an adult head louse, but is about the size of a pinhead. Nymphs mature after three molts (3, 4) and become adults about 7 days after hatching. Adults: The adult louse is about the size of a sesame seed, has 6 legs (each with claws), and is tan to grayish-white (5). In persons with dark hair, the adult louse will appear darker. Females are usually larger than males and can lay up to 8 nits per day. Adult lice can live up to 30 days on a person’s head. To survive , adult lice need to feed on blood several times daily. Without blood meals, the louse will die within 1 to 2 days off the host.From Centers for Disease Control Parasites and Health website.
Female human head louse, Pediculus humanus capitis.Technical settings : - focus stack of 46 images- microscope objective (Nikon achromatic 10x 160/0.25) directly on the body (with adapter ~30 mm)
Summary[edit] Description: Català: Ou desoperculat d’un poll, encara adherit a una mostra de cabell humà de més de 800 anys d'antiguitat. Microscopi electrònic de rastreig de pressió variable i ambiental. 200X. Date: 13 October 2015, 05:58:07. Source: Own work. Author: Amadalvarez.
Summary[edit] EPEMERA: To mothers only: for nursery use: F. Title: EPEMERA: To mothers only: for nursery use: F. Description: EPHEMERA COLLECTION: To mothers only: for nursery use: Fairline. [Magazine insert] Uttoxeter: Alfred Parker [ca. 1900?] Wellcome Images Keywords: alfred parker; epehemera; head-lice; fairline; ec. Credit line: : This file comes from Wellcome Images, a website operated by Wellcome Trust, a global charitable foundation based in the United Kingdom. Refer to Wellcome blog post (archive).This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.. References: Photo number: L0031554. Source/Photographer: https://wellcomeimages.org/indexplus/obf_images/86/0b/bd878cf3a7cf7e824b3e1d5d11fb.jpg Gallery: https://wellcomeimages.org/indexplus/image/L0031554.html Wellcome Collection gallery (2018-03-29): https://wellcomecollection.org/works/bbyvmyydCC-BY-4.0. Licensing[edit] : This file is licensed under the Creative CommonsAttribution 4.0 International license. :. You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. https://creativecommons.org/licenses/by/4.0 CC BY 4.0 Creative Commons Attribution 4.0 truetrue.
Summary[edit] Description: English: Head louse (Pediculus capitis): Larva and eggs, from a human host. Optical microscopy technique: Negative phase contrast. Magnification: 120x (for picture width 26 cm ~ A4 format). Čeština: Veš dětská (Pediculus capitis): Larva+vajíčka; Homo sapiens. Mikroskopická technika: Negativní fázový kontrast. Zvětšení: 120x (při šířce obrázku 26 cm ~ A4 formát). : This image comes from the archive of Josef Reischig and is part of the 384 pictures kindly donated by the authorship heirs under CC BY SA 3.0 license as a part of Wikimedia Czech Republic's GLAM initiative. čeština | English | +/−. Date:. Source: Author's archive. Author: Doc. RNDr. Josef Reischig, CSc..
Summary[edit] Description: Español: Esta es una foto a escala de la especie Pediculus humanus. Date: 27 February 2009. Source: Own work. Author: Raúl González Molina.
Summary[edit] Description: English: SEM Image of Head Louse Nit Operculum (1,000X Magnification). Date: 1 May 2011. Source: Template:Wabeggs. Author: Wabeggs.
Summary[edit] Description: English: Image of a head louse showing detail of claw gripping a human hair. Date: 11 May 2012. Source: Taken with USB microscope. Author: JulesH. : This file is made available under the Creative CommonsCC0 1.0 Universal Public Domain Dedication. The person who associated a work with this deed has dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission. http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse.
Summary[edit] Description: English: Head louse (Pediculus capitis): Adult, from a human host. Optical microscopy technique: Bright field. Magnification: 80x (for picture width 26 cm ~ A4 format). Čeština: Veš dětská (Pediculus capitis): Imago; Homo sapiens. Mikroskopická technika: Světlé pole. Zvětšení: 80x (při šířce obrázku 26 cm ~ A4 formát). : This image comes from the archive of Josef Reischig and is part of the 384 pictures kindly donated by the authorship heirs under CC BY SA 3.0 license as a part of Wikimedia Czech Republic's GLAM initiative. čeština | English | +/−. Date:. Source: Author's archive. Author: Doc. RNDr. Josef Reischig, CSc..