Video Experimental Relacionado
Updated: Aug 14, 2026

10:33
Isolation of Salmonella typhimurium-containing Phagosomes from Macrophages
Published on: October 25, 2017
La propagación de persona a persona del fago Salmonella typhimurium tipo 10 después de un brote de origen común
Lancet (London, England)
|April 18, 1981
Resumen
Un brote de Salmonella typhimurium en una sala de la universidad afectó a 67 personas. La tarta de cabaña contaminada causó la ola principal, con casos posteriores vinculados a la propagación de persona a persona.
Área de la Ciencia:
- Salud Pública La salud pública.
- Epidemiología de las enfermedades infecciosas.
- Enfermedades transmitidas por los alimentos Enfermedades transmitidas por los alimentos.
Sus antecedentes:
- Los brotes de gastroenteritis plantean desafíos significativos para la salud pública, particularmente en entornos institucionales.
- Salmonella typhimurium es una causa común de enfermedades transmitidas por los alimentos con potencial de transmisión generalizada.
Objetivo del estudio:
- Para investigar la causa y la dinámica de transmisión de un brote de Salmonella typhimurium tipo 10.
- Identificar la fuente primaria de infección y las rutas de transmisión secundarias dentro de una residencia universitaria.
Principales métodos:
- Investigación epidemiológica, incluidos los hallazgos de casos y encuestas con cuestionarios.
- Cribado de portadores asintomáticos entre individuos en riesgo.
- Recopilación de historias detalladas de alimentos de individuos afectados y no afectados.
Principales resultados:
- El brote involucró a 66 estudiantes y 1 miembro del personal, con un total de 67 casos.
- Una tarta de cottage contaminada fue identificada como la fuente probable de la mayoría de los casos (53).
- Los casos restantes se atribuyeron a la transmisión de persona a persona, destacando la propagación secundaria.
Conclusiones:
- Los brotes de Salmonella transmitidos por los alimentos pueden implicar una transmisión secundaria de persona a persona, especialmente en comunidades cerradas.
- Una investigación eficaz del brote requiere una búsqueda exhaustiva de casos y un cribado de portadores.
- Comprender las rutas de transmisión es crucial para controlar los brotes en entornos institucionales como las salas de la universidad.
Videos de Conceptos Relacionados
Sources of Food Contamination
Contamination of food by microbial agents and natural toxins poses significant risks to public health. These hazards can be introduced at various points across the food supply chain, ranging from environmental sources to processing and storage stages. Understanding these contamination pathways is critical for developing strategies to ensure food safety.Seafood is particularly vulnerable to contamination through both environmental exposure and microbial colonization. Toxins from harmful algal...
Reservoir of Infection
Infectious diseases arise from intricate interactions between pathogens and their reservoirs. A reservoir of infection refers to the natural habitat where a pathogen lives, grows, and multiplies, serving as a continual source of infection. Reservoirs are broadly classified as either living or nonliving, and each plays a unique role in disease transmission, significantly influencing public health interventions and control strategies.Humans act as reservoirs for a wide array of pathogens,...
Transmission of Pathogens
Pathogens spread from their reservoirs to susceptible hosts through three main routes: contact transmission, vehicle transmission, and vector transmission. Each route involves distinct mechanisms of transfer.Contact TransmissionThis category includes direct contact, indirect contact, and droplet transmission:Direct contact involves immediate physical interaction between individuals—such as a handshake—which can spread pathogens like Streptococcus pyogenes, the bacterium responsible for...
Investigation of Disease Outbreaks
Multistate foodborne outbreaks pose significant public health risks and require meticulous investigation to identify sources and implement control measures. The Centers for Disease Control and Prevention (CDC) utilizes a dynamic seven-step process for these investigations, integrating data from laboratories, interviews, and environmental assessments to protect public health.Outbreak Detection: The detection of multistate outbreaks typically begins with PulseNet, the CDC's national laboratory...
Bacterial Gastroenteritis
Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
Cholera
Cholera is an acute gastrointestinal disease caused by the Gram-negative bacterium Vibrio cholerae. It is transmitted primarily via the fecal-oral route through the ingestion of contaminated water or food.Vibrio cholerae is a motile, Gram-negative bacterium of the family Vibrionaceae, primarily associated with waterborne outbreaks in areas with inadequate sanitation. Although over 200 serogroups of V. cholerae exist, only O1 and O139 are responsible for epidemic cholera. The O1 serogroup,...

