Brady Collins
The smallpox vaccine is the first vaccine to have been developed against a contagious disease. It was created using the vaccinia virus, which is similar to smallpox but less harmful. The smallpox vaccine contains the live vaccinia virus, not a killed or weakened virus like many other vaccines. This vaccine stimulates a person's immune system to develop antibodies and cells in the blood and elsewhere that can then help the body fight off a real smallpox infection. The smallpox vaccine is administered by multiple punctures of the skin with a bifurcated needle that holds the vaccine solution in the fork. This results in a skin lesion that fills with pus and eventually crusts over, demonstrating immunity to smallpox. The smallpox vaccine provides full immunity for 3 to 5 years and decreasing immunity thereafter.
| Characteristics | Values |
|---|---|
| Type of immunity caused by the smallpox vaccine | Active |
| Type of vaccine | Live virus |
| Virus used in the smallpox vaccine | Vaccinia |
| Type of virus | Poxvirus |
| Similarity to smallpox virus | Related but causes milder disease |
| Ability to cause smallpox | Cannot cause smallpox |
| Immunity duration | 3 to 5 years, decreasing thereafter |
| Effectiveness | 95% effective in preventing smallpox infection |
| Immunity after recovery | People who recover from smallpox retain vaccinia-specific immunity |
| Number of vaccinations | Multiple vaccinations do not significantly increase immunity |
| Side effects | Rash, fever, body aches, etc. |
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What You'll Learn
Smallpox vaccine composition and administration
The smallpox vaccine is used to prevent smallpox infection caused by the variola virus. It is the first vaccine to have been developed against a contagious disease. The smallpox vaccine is made from a virus called vaccinia, which is a poxvirus similar to smallpox but less harmful. The smallpox vaccine contains a live vaccinia virus, not a killed or weakened virus like many other vaccines.
First-generation vaccines, which consist of live, unattenuated vaccinia virus, were widely distributed in the 1950s–1970s to eradicate smallpox. They are grown on the skin of live animals. Second-generation vaccines, grown in chorioallantoic membrane or cell cultures, were used in some areas during the smallpox eradication campaign. Third-generation vaccines are based on attenuated vaccinia strains and saw limited use before smallpox was eradicated. All three generations of vaccines are available in stockpiles.
The smallpox vaccine is administered by multiple punctures of the skin (scarification) with a bifurcated needle that holds the vaccine solution in the fork. The recommended vaccination site is the deltoid area on the upper arm. The skin should be cleaned with water, not alcohol, as alcohol could inactivate the vaccinia virus. The bifurcated needle is dipped into the vaccine solution and then used to prick the skin several times in a few seconds. The pricking is not deep but causes a sore spot and some bleeding.
A successful vaccination results in a red and itchy lesion at the vaccine site within 3–4 days. In the first week, the lesion becomes a large blister, fills with pus, and begins to drain. In the second week, the lesion dries out and forms a scab, which falls off in the third week, leaving a small scar. This manifestation of localized vaccinia infection is known as a "vaccine take" and demonstrates immunity to smallpox.
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The immune response to the smallpox vaccine
The smallpox vaccine was the first vaccine to be developed against a contagious disease. It was discovered by British physician Edward Jenner in 1796. The vaccine is made from a virus called vaccinia, a "pox"-type virus related to smallpox but milder. The smallpox vaccine contains the live vaccinia virus, not a killed or weakened virus like many other vaccines. This means that the vaccination site must be carefully cared for to prevent the virus from spreading.
The smallpox vaccine helps the body develop immunity to smallpox. It stimulates a person's immune system to develop antibodies and cells in the blood and elsewhere that can then help the body fight off a real smallpox infection if exposure occurs. A successful vaccination will result in a red and itchy bump at the site of the vaccination within 3-4 days. In the first week, the bump becomes a large blister, fills with pus, and begins to drain. During the second week, the blister dries up and a scab forms, which falls off in the third week, leaving a small scar.
The smallpox vaccine induces strong humoral responses that play a crucial role in protection against the disease. A prospective study by Mack et al. found that neutralizing serum antibody titers >1:32 were associated with protective immunity against smallpox disease. Vaccinia Immune Globulin (VIG), prepared from the serum of recent vaccinees, can prevent infection in close contacts of smallpox victims and treat vaccine-related complications.
T helper cells supply necessary cytokines (IL-4, IL-5) and costimulatory signals (CD40L) for B-cell maturation, replication, and isotype switching. T cell help (IL-2, IFNg) also promotes CTL activation, clonal expansion, and effector function. B cells produce antibodies that agglutinate, opsonize, and neutralize viral particles, fix complement, and allow for antibody-dependent cell cytotoxicity (ADCC). Cytokine secretion (IFNg, TNFa) by T lymphocytes can also have direct antiviral activity. Together, humoral and adaptive responses halt viral replication, lyse infected cells, and remove viral particles from the host.
Vaccination led to the eradication of smallpox, with the last case seen in 1977. However, smallpox still poses a threat through the possibility of bioterrorism and the intentional release of the virus. Currently, smallpox vaccines are not recommended for the general public, but health officials would use them to control an outbreak if one were to occur.
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The smallpox vaccine's effectiveness
The smallpox vaccine is highly effective in preventing smallpox infection. It was the first vaccine to be developed against a contagious disease, and it has successfully eradicated smallpox, making it the only human disease to be eliminated in this way. The last case of smallpox was reported in 1977, and the World Health Organization (WHO) certified its eradication in 1980.
The smallpox vaccine contains a live vaccinia virus, which is a "pox"-type virus related to smallpox but causes a milder infection. The vaccinia virus stimulates the body's immune system to produce antibodies and cells that can fight off a real smallpox infection. The vaccine does not contain the smallpox virus and cannot cause smallpox infection.
The smallpox vaccine is administered through multiple punctures of the skin in the upper arm using a bifurcated needle. This method creates a localized infection or "pock," which is a sign of successful vaccination. A blister forms at the vaccination site, dries up, and eventually scabs over, leaving a small scar.
The smallpox vaccine provides full immunity for about 3 to 5 years, after which its protection decreases. However, if a person is vaccinated again, their immunity lasts even longer. Historical data suggests that the smallpox vaccine has been effective in preventing smallpox infection in 95% of those vaccinated. Additionally, the vaccine can prevent or significantly reduce infection when given within a few days of exposure to smallpox.
While the smallpox vaccine is generally safe for most people, it can cause side effects such as rash, fever, and body aches. In some cases, complications from the vaccinia virus can be severe. Therefore, it is crucial to carefully manage the vaccination site to prevent the virus from spreading to other parts of the body or other individuals.
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The smallpox vaccine's side effects
The smallpox vaccine was the first vaccine to be developed against a contagious disease. It was discovered by British physician Edward Jenner in 1796. The vaccine is made from a virus called vaccinia, which is a "pox"-type virus similar to smallpox but less harmful.
The smallpox vaccine has several side effects, ranging from mild and self-limited to severe and life-threatening. One-third of first-time vaccine recipients experience side effects significant enough to disrupt their daily activities, such as school or work, or their sleep. Additionally, 15-20% of children receiving the vaccine for the first time develop fevers exceeding 102 °F (39 °C).
The vaccinia lesion can transmit the virus to others, and rare side effects include postvaccinal encephalitis and myopericarditis. First and second-generation vaccines, which contain live unattenuated vaccinia, can cause serious adverse reactions in a small percentage of recipients, including death in 1-10 people per million vaccinations.
To mitigate these risks, MVA (modified vaccinia Ankara) was considered as a pre-vaccine to reduce side effects or as an alternative for those at high risk. However, Japan rejected MVA due to its low immunogenicity and opted to develop its own attenuated vaccine. Third-generation vaccines, based on attenuated vaccinia strains, have reduced virulence and side effects.
While smallpox has been eradicated, the vaccine is still produced for research and as a precaution against bioterrorism and biological warfare.
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The smallpox vaccine's history
Smallpox is a highly contagious and often fatal infectious disease caused by the variola virus. It emerged in human populations thousands of years ago and has killed hundreds of millions of people. The symptoms of smallpox are gruesome: high fever, vomiting, mouth sores, followed by fluid-filled lesions on the whole body. Death would come suddenly, often within 2 weeks, and survivors could be left with permanent harm such as blindness and infertility.
One of the first methods for controlling smallpox was variolation, a process named after the variola virus. During variolation, people who had never had smallpox were exposed to material from smallpox sores by scratching or inhaling it. This method was practised in Africa, China, and possibly India, before it arrived in Europe. The first clear reference to smallpox inoculation was made by the Chinese author Wan Quan in his book published in 1549.
In 1716, Cotton Mather publicised the practice of variolation in the American colonies, where it was already known to and practised by enslaved West Africans. In 1721, during a smallpox epidemic in Massachusetts, Mather argued for its use. This encouraged the British Royal Family to take an interest, and a trial of variolation was carried out on prisoners in Newgate Prison. This was successful and led to the British people accepting the procedure as safe.
In 1796, British physician Edward Jenner demonstrated that an infection with the relatively mild cowpox virus conferred immunity against smallpox. Cowpox served as a natural vaccine until the modern smallpox vaccine emerged in the 20th century. Jenner referred to cowpox as variolae vaccinae (smallpox of the cow). From 1796 to the 1880s, the vaccine was transmitted from one person to another through arm-to-arm vaccination.
From 1958 to 1977, the World Health Organization (WHO) conducted a global vaccination campaign that eradicated smallpox, making it the only human disease to be eradicated. The campaign included universal childhood immunization programmes in some countries, mass vaccination in others, and targeted surveillance-containment strategies during the endgame. The Soviet Union provided freeze-dried vaccines, which became the basis for smallpox elimination in eastern Europe, China, and India.
Although routine smallpox vaccination is no longer performed on the general public, the vaccine is still being produced for research and to guard against bioterrorism, biological warfare, and mpox.
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Frequently asked questions
The smallpox vaccine provides active immunity.
Immunity from the smallpox vaccine lasts for about 3 to 5 years. After that, its ability to protect decreases.
No, the smallpox vaccine does not contain the smallpox virus and cannot give you smallpox. The vaccine is made from a live vaccinia virus, which is a "pox"-type virus related to smallpox but less harmful.
