Related Experiment Video
Updated: Aug 7, 2026
10:48
Vaccinia Reporter Viruses for Quantifying Viral Function at All Stages of Gene Expression
Published on: May 15, 2014
[Smallpox, an old foe]
1Departamento de Virologia, Fundação Oswado Cruz, Rio de Janeiro, RJ, 21040-360, Brasil. hermann@ioc.fiocruz.br
Cadernos De Saude Publica
|January 11, 2002
Summary
Smallpox, though eradicated, poses a renewed bioterrorism threat. Its slow spread and effective containment through early detection and vaccination highlight its historical control.
Area of Science:
- Virology
- Epidemiology
- Public Health
Context:
- Smallpox (variola virus) historically caused significant mortality and morbidity.
- Eradicated globally by 1977, smallpox remains a potential biological weapon concern.
- Past eradication data offers insights into disease transmission and control.
Purpose:
- To analyze smallpox transmission dynamics based on eradication campaign data.
- To assess the potential for smallpox re-emergence as a biological weapon.
- To evaluate the efficacy of containment strategies like blockade vaccination.
Summary:
- Smallpox spread slowly via close contact, with rare sub-clinical infections in unvaccinated individuals.
- Early case detection and ring vaccination effectively halted community transmission.
- Even with reinfection, vaccinated individuals rarely experienced severe illness.
Impact:
- Findings underscore the importance of early detection and rapid response for infectious disease control.
- The study informs biodefense strategies by assessing smallpox's potential as a biological weapon.
- Historical data provides a basis for understanding and mitigating risks associated with eradicated diseases.
Related Concept Videos
01:25Colonisation of Pathogens
Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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.
01:24Plague
Plague is a highly virulent zoonotic disease caused by Yersinia pestis, a Gram-negative, facultatively anaerobic coccobacillus. This pathogen primarily circulates among rodent populations and is transmitted to humans through the bite of infected fleas. Additional transmission routes include direct contact with infected animal tissue or inhalation of respiratory droplets from individuals with pneumonic plague. These multiple transmission pathways highlight the bacterium’s potential for rapid...
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,...
01:22American Trypanosomiasis
Chagas disease, or American trypanosomiasis, is a vector-borne parasitic infection caused by Trypanosoma cruzi, a flagellated protozoan (kinetoplastid) of the family Trypanosomatidae. The disease is endemic in Latin America, although cases are increasingly reported worldwide due to human migration. Transmission most commonly occurs when feces of infected triatomine bugs contaminate bite wounds or mucosal surfaces; additional routes include congenital, transfusional, transplant-related, and oral...