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Infection

Infection

When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...

Infectious Diseases and Their Occurrence

Infectious Diseases and Their Occurrence

Infectious diseases appear in populations through various transmission patterns, influenced by pathogen characteristics, population immunity, environmental conditions, and social behavior. Understanding these patterns is essential for effective public health surveillance and intervention. These categories—sporadic, outbreak, epidemic, pandemic, and endemic—help frame the nature and scope of disease events.Sporadic diseases occur irregularly and infrequently, without a predictable temporal or...

Reservoir of Infection

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

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...

Viral Meningitis

Viral Meningitis

Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...

Influenza

Influenza

Influenza is an acute, highly communicable viral disease that affects the respiratory tract and is responsible for seasonal epidemics worldwide. Influenza A is the most prevalent type associated with widespread outbreaks and is subtyped based on two surface glycoproteins: hemagglutinin (H) and neuraminidase (N), as in H1N1. These glycoproteins are essential for viral infectivity, transmission, and immune recognition. Transmission occurs primarily through respiratory droplets and contaminated...

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High-throughput Detection Method for Influenza Virus

High-throughput Detection Method for Influenza Virus

Published on: February 4, 2012

Conteniendo gripe pandémica en la fuente.

Ira M Longini¹, Azhar Nizam, Shufu Xu

¹Department of Biostatistics, The Rollins School of Public Health, Emory University, 1518 Clifton Road, N.E., Atlanta, GA 30322, USA. longini@sph.emory.edu

Science (New York, N.Y.)

|August 5, 2005

Resumen

La profilaxis antiviral dirigida, la vacunación previa y la cuarentena pueden contener las cepas emergentes de gripe aviar A (H5N1). Las respuestas preparadas con suficientes reservas antivirales son efectivas si el número reproductivo (R0) es inferior a 1,60.

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Área de la Ciencia:

Epidemiología La epidemiología.
Diseño de modelos de enfermedades infecciosas.
Preparación para la salud pública.

Sus antecedentes:

La gripe aviar altamente patógena A (H5N1) plantea una amenaza de pandemia significativa.
Las cepas de gripe emergentes requieren estrategias efectivas de contención en la fuente.

Objetivo del estudio:

Investigar la eficacia de las intervenciones para contener las cepas de gripe emergentes.
Determinar la escala requerida de existencias antivirales para la preparación para una pandemia.

Principales métodos:

Utilizó un modelo de simulación de gripe estocástica para el sureste asiático rural.
Se evaluó el impacto de la profilaxis antiviral dirigida, la cuarentena y la vacunación previa.
Evaluar el éxito de la contención basado en el número reproductivo básico (R0).

Principales resultados:

La contención es muy probable con los antivirales dirigidos si R0 < 1.60, requiriendo de 100,000 a 1 millón de cursos.
La vacunación previa mejora la eficacia antiviral, lo que permite la contención de las cepas con R0 hasta 2.1.
Las intervenciones combinadas pueden contener cepas con R0 tan alto como 2.4.4.

Conclusiones:

La profilaxis antiviral dirigida es una intervención clave para contener la gripe emergente.
La vacunación previa y la cuarentena aumentan significativamente la efectividad de las estrategias de contención.
La planificación de la preparación, incluida la acumulación de reservas antivirales, es crucial para mitigar los riesgos de pandemia.