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Related Concept Videos

Infection01:20

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 Occurrence01:28

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 Infection01:30

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 Pathogens01:24

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 Meningitis01:18

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...
Influenza01:27

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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Related Experiment Video

Updated: Jul 8, 2026

High-throughput Detection Method for Influenza Virus
10:05

High-throughput Detection Method for Influenza Virus

Published on: February 4, 2012

Containing pandemic influenza at the source.

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
PubMed
Summary

Targeted antiviral prophylaxis, pre-vaccination, and quarantine can contain emerging avian influenza A (H5N1) strains. Prepared responses with sufficient antiviral stockpiles are effective if the reproductive number (R0) is below 1.60.

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Development of Multiplex Real-Time RT-qPCR Assays for the Detection of SARS-CoV-2, Influenza A/B, and MERS-CoV
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Published on: November 10, 2023

Area of Science:

  • Epidemiology
  • Infectious Disease Modeling
  • Public Health Preparedness

Background:

  • Highly pathogenic avian influenza A (H5N1) poses a significant pandemic threat.
  • Emerging influenza strains require effective containment strategies at the source.

Purpose of the Study:

  • To investigate the effectiveness of interventions for containing emerging influenza strains.
  • To determine the required scale of antiviral stockpiles for pandemic preparedness.

Main Methods:

  • Utilized a stochastic influenza simulation model for rural Southeast Asia.
  • Evaluated the impact of targeted antiviral prophylaxis, quarantine, and pre-vaccination.
  • Assessed containment success based on the basic reproductive number (R0).

Main Results:

  • Containment is highly probable with targeted antivirals if R0 < 1.60, requiring 100,000 to 1 million courses.
  • Pre-vaccination enhances antiviral effectiveness, enabling containment of strains with R0 up to 2.1.
  • Combined interventions can contain strains with R0 as high as 2.4.

Conclusions:

  • Targeted antiviral prophylaxis is a key intervention for containing emerging influenza.
  • Pre-vaccination and quarantine significantly increase the effectiveness of containment strategies.
  • Preparedness planning, including antiviral stockpiling, is crucial for mitigating pandemic risks.