What is Smallpox Definition Causes Symptoms and Eradication
It is an extremely contagious and deadly virus for which there is no known cure. In the United States in 1949, the last known case occurred and due to worldwide vaccination programs, this disease has been completely eradicated. Smallpox is also known as variola.
Caused by one of two virus variants, Variola major and Variola minor, smallpox was an infectious disease. This contagious disease came into existence in 10,000 BC. This syndrome was declared as completely eradicated after the global immunization campaign led by the World Health Organization (WHO), in 1980 with the help of the smallpox vaccine. In 1796,the first effective vaccine was discovered of the smallpox, and it was developed by Edward Jenner. The last symptoms of this infectious disease were found in the year 1977.
Smallpox is a contagious disease, which transmits from one person to another by infective droplets of an infected person. For this contagious disease there is no treatment found, but could be prevented through the vaccinations.
The Smallpox Virus Variola
Variola minor and Variola major are the two forms of variola virus. Being a member of the orthopoxvirus family, variola virus is a deadly virus. The virus resembles brick ones and the core of the virus to make the structure, which is made up of a genetic material DNA which resembles a dumbbell in shape. The DNA in the core comprises necessary proteins, which are required to replicate the host’s cell. There is a 17 days period for the incubation of this disease, which later results in severe fever with the appearance of rashes on the face, legs, hands, arms, etc.
Causes of Smallpox
Smallpox spreads at a faster rate, which is an airborne disease and is mainly caused by an infection of a deadly type of virus variola. The causes of this virus is as follows:
It transmits through the droplets released from coughing, sneezing, and face to face contact with an infected person.
By sharing drinks, exchange of body fluids like blood transfusion and etc, this infection is also transmitted.
Caused by even touching any contaminated area.
By using unclean syringes or the used ones.
Symptoms of Smallpox
Usually, the symptoms occur after 17 days of the infection of the variola virus. After the incubation period general symptoms are seen are as follows:
High fever followed with chills.
Vomiting or nausea.
A severe headache, followed by other body pains.
After the attack it develops rashes, filled up with pus or fluid on the face, legs, hands, arms, etc.
Treatment for Smallpox
Smallpox is a contagious disease, which transmits from one person to another by infective droplets of an infected person. For this contagious disease, there is no treatment found. There is no such cure available for this syndrome, since it is a deadly disease. By vaccinating with the smallpox vaccine, it could be still prevented. From illness and causing fatal conditions to humans for the disease, this vaccine helps to prevent. The antibodies present in this vaccine protects the body from invading and to destroy the virus.
Fun Facts
Smallpox was an infectious disease caused by one of two virus variants, Variola major and Variola minor. In october 1977, The last naturally occurring case was diagnosed, and has been certified the global eradication of the disease in 1980 by the World Health Organization (WHO).
There's no treatment or cure for smallpox. Though a vaccine can prevent it, the vaccine's side effect risk is too high to justify routine vaccination for people at low risk of exposure to the virus.
In addition to flu-like symptoms, patients also experience a rash that appears first on the face, hands and forearms and then later appears on the torso.
Usually, after the infection of the variola virus, the symptoms occur after 17 days.
Since the time of ancient Egypt, smallpox has proven to be one of the most devastating diseases to humankind. The pages of our history books have been filled by the widespread smallpox epidemics and huge death tolls.
The first smallpox vaccine was created in 1758. But, the disease continued the process of infecting and killing people on a widespread basis for another 200 years.
It was one of the world's most devastating diseases known to humanity. In Somalia in 1977 it was the last known natural case. Naturally occurring smallpox was destroyed worldwide by 1980.
FAQs on Smallpox Overview Causes Symptoms and Prevention
1. What is smallpox?
Smallpox is a highly contagious viral disease caused by the Variola virus that produces fever and a characteristic skin rash. It is a member of the Poxviridae family and infects humans only. Key features include:
- High fever and body aches in the early stage
- Progression to a widespread pustular rash
- Transmission through respiratory droplets or close contact
- Global eradication declared in 1980 by the World Health Organization (WHO)
2. What causes smallpox?
Smallpox is caused by the Variola virus, a double-stranded DNA virus belonging to the genus Orthopoxvirus. There are two main forms:
- Variola major – more severe and often fatal
- Variola minor – milder form with lower mortality
The virus infects epithelial cells and spreads through the bloodstream, leading to systemic infection and skin lesions.
3. How does smallpox spread from person to person?
Smallpox spreads mainly through direct inhalation of respiratory droplets from an infected person. Transmission occurs by:
- Close face-to-face contact
- Contact with contaminated clothing or bedding (fomites)
- Exposure to fluid from skin lesions
Humans are the only natural host, and the disease is most contagious after the rash appears.
4. What are the symptoms of smallpox?
The main symptoms of smallpox include high fever followed by a distinctive progressive skin rash. The illness typically progresses in stages:
- Incubation period (7–17 days): no symptoms
- Prodromal stage: high fever, headache, back pain, fatigue
- Rash stage: red spots that develop into fluid-filled vesicles and then pus-filled pustules
- Scabbing stage: lesions crust and fall off, leaving scars
5. What is the incubation period of smallpox?
The incubation period of smallpox is typically 7 to 17 days, during which the infected person shows no symptoms and is not contagious. After this period:
- Fever and malaise appear suddenly
- The virus spreads via the bloodstream (viremia)
- A characteristic rash develops 2–3 days later
6. How is smallpox different from chickenpox?
Smallpox is more severe and caused by the Variola virus, while chickenpox is milder and caused by the Varicella-zoster virus. Key differences include:
- Lesion distribution: Smallpox lesions are concentrated on the face and limbs; chickenpox lesions are more on the trunk.
- Lesion stages: Smallpox lesions are at the same stage of development; chickenpox lesions appear in different stages.
- Severity: Smallpox has a higher mortality rate.
7. How was smallpox eradicated?
Smallpox was eradicated through a global vaccination campaign using the smallpox vaccine based on the Vaccinia virus. The eradication strategy included:
- Mass immunization programs worldwide
- Surveillance and rapid identification of cases
- Ring vaccination around detected infections
In 1980, the WHO officially declared smallpox eradicated.
8. Is there a cure or treatment for smallpox?
There is no specific cure for smallpox, but antiviral drugs and supportive care can improve survival. Management includes:
- Isolation of infected individuals
- Hydration and fever control
- Use of antiviral agents such as tecovirimat (approved for orthopoxvirus infections)
Prevention through vaccination remains the most effective control measure.
9. What is the smallpox vaccine and how does it work?
The smallpox vaccine uses a live Vaccinia virus to stimulate immunity against the Variola virus. It works by:
- Triggering production of neutralizing antibodies
- Activating cell-mediated immunity
- Providing long-lasting immune memory
The vaccine does not contain the variola virus itself and can also provide protection if given shortly after exposure.
10. Why is smallpox considered one of the deadliest diseases in history?
Smallpox is considered one of the deadliest diseases because it had a high mortality rate and caused large-scale epidemics worldwide. Important reasons include:
- Mortality rate of up to 30% in Variola major infections
- Severe complications such as blindness and scarring
- Rapid spread in non-immune populations
- Major impact on historical populations and civilizations
Its global eradication remains one of the greatest achievements in public health and medical biology.
