Video Experimental Relacionado
Updated: Jul 8, 2026
08:23
Feeding of Ticks on Animals for Transmission and Xenodiagnosis in Lyme Disease Research
Published on: August 31, 2013
Etiología de la erupción papular pruriginosa con infección por VIH en Uganda
Jack S Resneck1, Marta Van Beek, Lisa Furmanski
1Department of Dermatology and Institute for Health Policy Studies, University of California, San Francisco, School of Medicine, CA 94143-0363, USA. resneck@itsa.ucsf.edu
JAMA
|December 2, 2004
Resumen
La erupción papular pruriginosa (PPE) en individuos infectados por el VIH en África a menudo es causada por picaduras de insectos. Esta condición puede ser el resultado de una respuesta inmune exagerada a los antígenos de artrópodos en pacientes susceptibles.
Área de la Ciencia:
- Dermatología Dermatología dermatología.
- Enfermedades infecciosas Enfermedades infecciosas.
- Inmunología Inmunología.
Sus antecedentes:
- La erupción papular pruriginosa (PPE) es una afección cutánea común y desfigurante en personas infectadas por el VIH en el África subsahariana.
- La causa de los EPI ha permanecido en gran medida desconocida a pesar de su alta prevalencia.
Objetivo del estudio:
- Para investigar la causa subyacente de la erupción papular pruritosa (PPE) en pacientes infectados por el VIH.
Principales métodos:
- Se realizó un estudio transversal en Uganda con pacientes infectados por el VIH con EPI activo.
- Los métodos incluyeron el examen clínico, pruebas de laboratorio (número de células CD4, número de eosinófilos), cuestionarios epidemiológicos y análisis de biopsia de piel por dermatopatólogos.
Principales resultados:
- De 102 participantes, el 84% mostró hallazgos de la biopsia consistentes con las picaduras de artrópodos.
- Los recuentos más bajos de células CD4 se correlacionaron con un aumento de la gravedad de la erupción.
- Los pacientes con mordeduras de artrópodos confirmadas por biopsia tenían recuentos más altos de eosinófilos y una tendencia hacia recuentos CD4 más bajos.
Conclusiones:
- La erupción papular pruriginosa en individuos infectados por el VIH es probablemente una reacción a las picaduras de artrópodos.
- La condición puede derivarse de una respuesta inmune alterada y exagerada a los antígenos de artrópodos en individuos VIH-positivos susceptibles.
Videos de Conceptos Relacionados
01:23Skin 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...
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
01:26Rocky Mountain Spotted Fever
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.
01:24Smallpox
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.
01:20Chickenpox
Chickenpox is an acute, highly contagious disease caused by the varicella-zoster virus (VZV), a double-stranded DNA virus belonging to the Herpesviridae family. Its transmission occurs primarily through the inhalation of respiratory droplets or direct contact with vesicular fluid from skin lesions. The incubation period typically ranges from 10 to 21 days, during which the virus replicates and disseminates through sequential phases within the host. Although generally self-limiting in children,...
01:27Cryptococcal Meningitis
Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...
01:28Amebiasis
Entamoeba histolytica, a protozoan parasite, is responsible for intestinal and extraintestinal amebiasis. Though a significant proportion of infections remain asymptomatic, approximately 50 million individuals annually are estimated to present with clinical disease, resulting in up to 100,000 deaths globally. The disease burden is disproportionately high in regions with lower socioeconomic status, such as parts of India, Africa, Mexico, and Latin America.Etiology and TransmissionThe infective...