Related Experiment Video
Updated: Jun 19, 2026
10:48
Vaccinia Reporter Viruses for Quantifying Viral Function at All Stages of Gene Expression
Published on: May 15, 2014
FURTHER STUDIES OF THE INFECTIOUS UNIT OF VACCINIA
R F Parker1, L H Bronson, R H Green
1Department of Medicine of Western Reserve University, School of Medicine, and the Lakeside Hospital, Cleveland.
The Journal of Experimental Medicine
|October 30, 2009
Summary
This study reveals that viral particle virulence is uniform, with infection probability depending on viral dose. Host susceptibility varies, influencing infection outcomes.
Area of Science:
- Virology
- Immunology
- Microbiology
Background:
- Comparative analysis of vaccine virus strains across various hosts is crucial for understanding disease dynamics.
- Previous research indicated significant variations in animal susceptibility to viral infections.
Purpose of the Study:
- To investigate the comparative virulence of different vaccine virus strains.
- To elucidate the relationship between viral particle characteristics and host susceptibility.
- To statistically analyze the factors governing infection probability.
Main Methods:
- Experiments were conducted using a chick-embryo-adapted viral strain.
- Comparative virulence assays were performed across multiple host species.
- Statistical analyses, including binomial theorem application, were employed to model infection probabilities.
Main Results:
- Viral particles of the chick-embryo-adapted strain exhibited uniform virulence.
- Increased viral strain virulence correlated with elementary bodies per infectious unit approaching one.
- Host susceptibility differences, potentially due to variations in susceptible cells, influence infection outcomes.
Conclusions:
- Infection probability is primarily determined by viral presence at high virulence.
- At lower virulence, infection chance is influenced by the distribution of susceptible host cells.
- Host cell availability for parasitism likely follows a normal distribution within a species.
Related Concept Videos
01:51Vaccinations
Overview
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.
01:23Vaccine Production
Vaccine production involves a sequence of upstream and downstream processes to generate a safe and effective immunological product. It begins with cultivating microorganisms, such as viruses or bacteria, to obtain antigenic material. For viral vaccines, mammalian host cells are grown in bioreactors and subsequently infected with the target virus. The virus replicates within the host cells, which are lysed to release viral particles. This lysate is then clarified through filtration or...
01:21Vaccines
Vaccines are among the most effective tools in preventive medicine, designed to prepare the immune system to recognize and combat infectious agents. By introducing antigens—substances that the immune system identifies as foreign—vaccines stimulate an adaptive immune response that leads to immunological memory. This immunological memory enables the body to mount a faster and more effective response upon future exposures to the actual pathogen.Vaccines can be categorized based on the type of...
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,...
01:22Development of Immunocompetence
The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...