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Skin Diseases and Disorders

Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
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Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.
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Smallpox is a severe contagious disease caused by the Variola major virus, a double-stranded DNA member of the Poxviridae family.Variola major transmission occurs primarily via inhalation of virus-laden droplets or direct contact with infectious scabs. The incubation period averages approximately seven days, although it may range from 7 to 17 days depending on the inoculum and host factors.Clinically, the prodromal phase is marked by an abrupt onset of high fever, malaise, headache, and myalgia.
Malaria01:29

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Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...
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Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

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Video Experimental Relacionado

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Taste Preference Assay for Adult Drosophila
04:31

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Eritema multiforme generalizado inducido por acarbosa.

T Kono, M Hayami, H Kobayashi

    Lancet (London, England)
    |August 7, 1999
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Un hombre de 58 años desarrolló una erupción cutánea generalizada y altos recuentos de eosinófilos después de comenzar a tomar acarbose para la diabetes. Se confirmó que la acarbosa era la causa de esta reacción alérgica.

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    Área de la Ciencia:

    • Farmacología Farmacología.
    • Dermatología Dermatología dermatología.
    • Alergia e Inmunología.

    Sus antecedentes:

    • La acarbosa es un inhibidor de la alfa-glucosidasa utilizado para controlar la diabetes mellitus tipo 2.
    • El control glucémico efectivo es crucial en pacientes diabéticos para prevenir complicaciones a largo plazo.

    Objetivo del estudio:

    • Informar de un caso de eritema multiforme generalizado y eosinophilia potencialmente vinculado al tratamiento con acarbose.
    • Para confirmar la relación causal entre la acarbosa y la reacción adversa observada.

    Principales métodos:

    • Un paciente con diabetes mellitus fue iniciado en acarbose 300 mg al día.
    • Se realizaron exámenes clínicos e histológicos para detectar eritema multiforme y eosinophilia.
    • Se realizó una prueba de desafío de acarbosa para determinar la reacción alérgica.

    Principales resultados:

    • El eritema multiforme generalizado se desarrolló 13 días después de comenzar a tomar acarbose.
    • Se detectó eosinofilia en sangre y tejidos.
    • La prueba de desafío de acarbose confirmó una reacción alérgica, tanto clínica como histológica.

    Conclusiones:

    • Acarbose puede inducir una reacción de hipersensibilidad que se presenta como eritema multiforme generalizado con eosinophilia.
    • Este caso pone de relieve la importancia de considerar la acarbosa como una causa potencial de tales eventos adversos.
    • La confirmación histológica y las pruebas de desafío son valiosas para diagnosticar la hipersensibilidad inducida por medicamentos.