Cholera vaccine

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Cholera vaccine
Dukoral package vaccine vial.jpg
Vaccine description
Target Vibrio cholerae
Vaccine type Inactivated
Clinical data
Trade names Dukoral, Vaxchora, others
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A cholera vaccine is a vaccine that is effective at preventing cholera. [10] The currently recommended cholera vaccines are administered orally to elicit a protective local mucosal immune response in the gut, which was poorly achieved with the injectable vaccines that were used until the 1970s. The first effective oral cholera vaccine was Dukoral, developed in Sweden in the 1980s. For the first six months after vaccination it provides about 85 percent protection, which decreases to approximately 60 percent during the first two years. [10] [11] [12] When enough of the population is immunized, it may protect those who have not been immunized thereby increasing the total protective impact to more than 90 percent (known as herd immunity). [10]

Contents

The World Health Organization (WHO) currently recommends the use of three oral cholera vaccines – Dukoral, Shanchol and Euvichol-Plus – in combination with other measures among those at high risk for cholera. [10] Two vaccine doses with a 1-6 week interval are typically recommended. [10] The duration of protection is at least two years in adults and six months in children aged 1–5 years. [10] A live, attenuated single dose oral vaccine is available for those traveling to an area where cholera is common but is not WHO approved for public health use. [13] [14] [15]

The available types of oral vaccine are generally safe. [10] Mild abdominal pain or diarrhea may occur. [10] They are safe in pregnancy and in those with poor immune function. [10] They are licensed for use in more than 60 countries. [10] In countries where the disease is common, the vaccine appears to be cost effective. [10]

The first cholera vaccines were developed in the late 19th century. [16] They were the first widely used vaccine that was made in a laboratory but were largely abandoned in the 1970s due to their then documented reactogenicity and poor efficacy . [16]

Oral cholera vaccines were first introduced in the 1990s. [10] It is on the World Health Organization's List of Essential Medicines. [17] [18]

Medical use

In the late twentieth century, oral cholera vaccines started to be used on a massive scale, with millions of vaccinations taking place, as a tool to control cholera outbreaks in addition to the traditional interventions of improving safe water supplies, sanitation, handwashing, and other means of improving hygiene. [19] The Dukoral vaccine, which combines formalin- and heat-killed whole cells of Vibrio cholerae O1 and a recombinant cholera toxin B subunit, was licensed in 1991 and has been used widely, mainly for travellers. [10] The Shanchol bivalent vaccine, which combines the O1 and O139 serogroups, was originally developed in Vietnam under the name mORCVAX in 1997 and given in 20 million doses in Vietnam´s public health programme during the following decade through targeted mass vaccination of school-aged children in cholera endemic regions. [10]

The World Health Organization (WHO) recommends both preventive and reactive use of the vaccine, making the following key statements: [20]

WHO recommends that current available cholera vaccines be used as complements to traditional control and preventive measures in areas where the disease is endemic and should be considered in areas at risk for outbreaks. Vaccination should not disrupt the provision of other high priority health interventions to control or prevent cholera outbreaks.... Reactive vaccination might be considered in view of limiting the extent of large prolonged outbreaks, provided the local infrastructure allows it, and an in-depth analysis of past cholera data and identification of a defined target area have been performed.

Although the vaccine specific protection observed, 60–70 percent, has been described as "moderate", herd immunity can multiply the effectiveness of vaccination. Dukoral has been licensed for children two years of age and older, Shanchol and Euvichol-Plus for children one year of age and older. The administration of the vaccine to adults confers additional indirect protection (herd immunity) also to children.

The WHO as of 2013 established a revolving stockpile, initially of only two million oral cholera vaccine doses. [21] With donations from mainly the GAVI Alliance the stockpile has progressively expanded to now more than 40 million doses per year. [22] [23] It consists mainly of the Euvichol-Plus oral cholera vaccine being produced in South Korea. In total more than 150 million doses from the stockpile have been given in mass campaigns against both epidemic and endemic cholera in more than 25 cholera afflicted countries. A set goal of WHO´s Global Task Force for Cholera Control (GTFCC) is, by using oral cholera vaccine and other available tools, by 2030 to have reduced cholera deaths by more than 90% and stopped transmission globally.  

Oral

Dukoral: vial of inactivated vaccine with packet of sodium bicarbonate buffer Dukoral vial bicarb.jpg
Dukoral: vial of inactivated vaccine with packet of sodium bicarbonate buffer

The oral vaccines are generally of two forms: inactivated and attenuated.[ citation needed ]

The first developed effective oral cholera vaccine, Dukoral, is a monovalent inactivated vaccine containing killed whole cells of V. cholerae O1 plus additional recombinant cholera toxin B subunit. Bacterial strains of both Inaba and Ogawa serotypes and of El Tor and Classical biotypes are included in the vaccine. Dukoral is taken orally with bicarbonate buffer, which protects the antigens from the gastric acid. The vaccine acts by inducing antibodies against both the bacterial components and CTB. The antibacterial intestinal antibodies prevent the bacteria from attaching to the intestinal wall, thereby impeding colonisation of V. cholerae O1. The anti-toxin intestinal antibodies prevent the cholera toxin from binding to the intestinal mucosal surface, thereby preventing the toxin-mediated diarrhoeal symptoms. [24]

The two later inactivated oral cholera vaccines recommended by WHO, Shanchol and Euvichol-Plus, have an identical composition, containing killed whole cells of V. cholerae O1 (the same components as in Dukoral) plus formalin-killed V. cholerae O139 bacteria.[ citation needed ]

A live, attenuated oral vaccine (CVD 103-HgR or Vaxchora), derived from a serogroup O1 classical Inaba strain, was approved for use in travellers by the US FDA in 2016. [13] [25] [14]

Injectable

Although rarely in use, the injected cholera vaccines can be effective for people living where cholera is common. While being ineffective in young children, in such areas they can offer some degree of protection in adults and older children for up to six months. [11]

Side effects

Both of the available types of oral vaccine are generally safe. [10] Mild abdominal pain or diarrhea may occur. [10] They are safe in pregnancy and in those with poor immune function. [10] They are licensed for use in more than 60 countries. [10] In countries where the disease is common, the vaccine appears to be cost effective. [10]

History of development

Cholera vaccinations by a Guinean nurse using a jet injector in Ziguinchor, Senegal, 1973 ASC Leiden - Coutinho Collection - G 01 - Ziguinchor, Senegal - Cholera vaccinations by Guinean nurse - 1973.tif
Cholera vaccinations by a Guinean nurse using a jet injector in Ziguinchor, Senegal, 1973

The first cholera vaccines were developed in the late 19th century. There were several pioneers in the development of the vaccine:

Oral cholera vaccines were first introduced in the 1990s. [10]

Society and culture

In 2016, the U.S. Food and Drug Administration (FDA) approved Vaxchora, [15] [14] [25] a single-dose oral vaccine to prevent cholera for travelers. As of June 2016, Vaxchora was the only FDA-approved vaccine for the prevention of cholera. [25]

Economics

The cost to immunize against cholera is between US$0.10 and US$4.00 per vaccination. [35]

The Vaxchora vaccine can cost more than US$250. [36]

Related Research Articles

<span class="mw-page-title-main">Cholera</span> Bacterial infection of the small intestine

Cholera is an infection of the small intestine by some strains of the bacterium Vibrio cholerae. Symptoms may range from none, to mild, to severe. The classic symptom is large amounts of watery diarrhea lasting a few days. Vomiting and muscle cramps may also occur. Diarrhea can be so severe that it leads within hours to severe dehydration and electrolyte imbalance. This may result in sunken eyes, cold skin, decreased skin elasticity, and wrinkling of the hands and feet. Dehydration can cause the skin to turn bluish. Symptoms start two hours to five days after exposure.

<span class="mw-page-title-main">Vaccine</span> Pathogen-derived preparation that provides acquired immunity to an infectious disease

A vaccine is a biological preparation that provides active acquired immunity to a particular infectious or malignant disease. The safety and effectiveness of vaccines has been widely studied and verified. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and recognize further and destroy any of the microorganisms associated with that agent that it may encounter in the future.

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<span class="mw-page-title-main">DPT vaccine</span> Combination vaccine

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<span class="mw-page-title-main">Influenza vaccine</span> Vaccine against influenza

Influenza vaccines, colloquially known as flu shots, are vaccines that protect against infection by influenza viruses. New versions of the vaccines are developed twice a year, as the influenza virus rapidly changes. While their effectiveness varies from year to year, most provide modest to high protection against influenza. Vaccination against influenza began in the 1930s, with large-scale availability in the United States beginning in 1945.

<span class="mw-page-title-main">Varicella vaccine</span> Vaccine to prevent chickenpox

Varicella vaccine, also known as chickenpox vaccine, is a vaccine that protects against chickenpox. One dose of vaccine prevents 95% of moderate disease and 100% of severe disease. Two doses of vaccine are more effective than one. If given to those who are not immune within five days of exposure to chickenpox it prevents most cases of disease. Vaccinating a large portion of the population also protects those who are not vaccinated. It is given by injection just under the skin. Another vaccine, known as zoster vaccine, is used to prevent diseases caused by the same virus – the varicella zoster virus.

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<span class="mw-page-title-main">Hepatitis A vaccine</span> Vaccine to prevent hepatitis A

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Firdausi Qadri is a Bangladeshi scientist with specialization in immunology and infectious disease research. She has worked over 25 years on the development of vaccines for cholera and has expertise on other infectious disease like ETEC, Typhoid, Helicobacter pylori, rotavirus, etc. Currently, she is working as a director for Centre for Vaccine Sciences of International Centre for Diarrhoeal Disease and Research, Bangladesh (ICDDR,B). She also serves as chairperson of the Institute for developing Science and Health initiatives. Her scientific achievements lie in enteric infections and vaccines including Vibrio cholerae and enterotoxigenic Escherichia coli—major causes of severe diarrhea. She has also focused on studying the immune response in Helicobacter pylori infected people in Bangladesh and the responses in patients with typhoid fever as well as vaccinees. The Government of Bangladesh awarded her the Independence Award in 2023.

Jan Roland Holmgren is a Swedish physician, microbiologist, immunologist, and vaccinologist, known for his research on cholera and mucosal immunology, specifically, for his leadership in developing "the world's first effective oral cholera vaccine".

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Further reading