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Yellow fever vaccine

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Yellow fever vaccine
Yellow fever vaccine vials (Brazil)
Vaccine description
TargetYellow fever
Vaccine typeAttenuated
Clinical data
Trade namesYF-Vax, Stamaril
Other names17D vaccine
AHFS/Drugs.comMonograph
MedlinePlusa607030
Pregnancy
category
Routes of
administration		Subcutaneous
ATC code
Legal status
Legal status
Identifiers
ChemSpider
  • none
UNII
 ☒NcheckY (what is this?)  (verify)

Yellow fever vaccine is a vaccine that protects against yellow fever.[4] Yellow fever is a viral infection that occurs in Africa and South America.[4] Most people begin to develop immunity within ten days of vaccination and 99% are protected within one month, and this appears to be lifelong.[4] The vaccine can be used to control outbreaks of disease.[4] It is given either by injection into a muscle or just under the skin.[4][5]

The World Health Organization (WHO) recommends routine immunization in all countries where the disease is common.[4] This should typically occur between nine and twelve months of age.[4] Those traveling to areas where the disease occurs should also be immunized.[4] Additional doses after the first are generally not needed.[6]

The yellow fever vaccine is generally safe.[4] This includes in those with HIV infection but without symptoms.[4] Mild side effects may include headache, muscle pains, pain at the injection site, fever, and rash.[4] Severe allergies occur in about eight per million doses, serious neurological problems occur in about four per million doses, and organ failure occurs in about three per million doses.[4] It appears to be safe in pregnancy and is therefore recommended among those who will be potentially exposed.[4] It should not be given to those with very poor immune function.[7]

Yellow fever vaccine came into use in 1938.[8] It is on the World Health Organization's List of Essential Medicines.[9][10] The vaccine is made from weakened yellow fever virus.[4] Some countries require a yellow fever vaccination certificate before entry from a country where the disease is common.[4][5]

Medical uses

[edit]
A yellow fever vaccination certificate issued by the Soviet Union.

Targeting

[edit]

Medical experts recommend vaccinating people most at risk of contracting the virus, such as woodcutters working in tropical areas.[11] Insecticides, protective clothing, and screening of houses are helpful, but not always sufficient for mosquito control; medical experts recommend using personal insecticide spray in endemic areas.[12] In affected areas, mosquito control methods have proven effective in decreasing the number of cases.[13]

Travellers need to have the vaccine ten days before being in an endemic area to ensure full immunity.[14]: 45 

Duration and effectiveness

[edit]

For most people, the vaccine remains effective permanently. People who are HIV positive at vaccination can benefit from a booster after ten years.[15]

On 17 May 2013, the World Health Organization (WHO) Strategic Advisory Group of Experts on immunization (SAGE) announced that a booster dose of yellow fever (YF) vaccine, ten years after a primary dose, is not necessary.[16] Since yellow fever vaccination began in the 1930s, only 12 known cases of yellow fever post-vaccination have been identified after 600 million doses have been dispensed.[17] Evidence showed that among this small number of "vaccine failures", all cases developed the disease within five years of vaccination.[18] This demonstrates that immunity does not decrease with time.[19]

Schedule

[edit]

The World Health Organization recommends the vaccine between the ages of 9 and 12 months in areas where the disease is common.[4] Anyone over the age of nine months who has not been previously immunized and either lives in or is traveling to an area where the disease occurs should also be immunized.[4]

Side effects

[edit]

The yellow fever 17D vaccine is considered safe, with over 500 million doses given and very few documented cases of vaccine-associated illness (62 confirmed cases and 35 deaths as of January 2019).[20] In no case of vaccine-related illness has there been evidence of the virus reverting to a virulent phenotype.[medical citation needed][21]

The majority of adverse reactions to the 17D vaccine result from allergic reactions to the eggs in which the vaccine is grown.[22] Persons with known egg allergy should discuss this with their physician before vaccination.[23] In addition, there is a small risk of neurologic disease and encephalitis, particularly in individuals with compromised immune systems and very young children. The 17D vaccine is contraindicated in (among others) infants between zero and six months,[24] people with thymus disorders associated with abnormal immune cell function, people with primary immunodeficiencies, and anyone with a diminished immune capacity including those taking immunosuppressant drugs.[25]

There is a small risk of more severe yellow fever-like disease associated with the vaccine. This reaction, known as yellow fever vaccine-associated acute viscerotropic disease (YEL-AVD),[26] causes a fairly severe disease closely resembling yellow fever caused by virulent strains of the virus.[27] The risk factors for YEL-AVD are not known, although it has been suggested that it may be genetic.[28] The 2'-5'-oligoadenylate synthase (OAS) component of the innate immune response is particularly important in protection from Flavivirus infection.[29] Another reaction to the yellow fever vaccine is known as yellow fever vaccine-associated acute neurotropic disease (YEL-AND).[30]

The Canadian Medical Association published a 2001 CMAJ article entitled "Yellow fever vaccination: be sure the patient needs it".[31] The article begins by stating that of the seven people who developed system failure within two to five days of the vaccine in 1996–2001, six died "including 2 who were vaccinated even though they were planning to travel to countries where yellow fever has never been reported."[32] The article cites that "3 demonstrated histopatholic changes consistent with wild yellow fever virus."[33] The author recommends vaccination for only non-contraindicated travelers (see the articles list) and those travelers going where yellow fever activity is reported or in the endemic zone which can be found mapped at the CDC website cited below.[34] In addition, the 2010 online edition of the Center for Disease Control Traveler's Health Yellow Book states that between 1970 and 2002 only "nine cases of yellow fever were reported in unvaccinated travelers from the United States and Europe who traveled" to West Africa and South America, and 8 of the 9 died.[35] However, it goes on to cite "only 1 documented case of yellow fever in a vaccinated traveler.[36] This nonfatal case occurred in a traveler from Spain who visited several West African countries in 1988".[37]

History

[edit]

African tropical cultures had adopted burial traditions in which the deceased were buried near their habitation, including those who died of Yellow fever.[38] This ensured that people within these cultures gained immunity through a childhood case of "endemic" yellow fever through acquired immunity. This led to a lasting misperception, first by colonial authorities and foreign medical experts, that Africans have a "natural immunity"[39] to the illness. In the nineteenth century health provisioners forced the abandonment of these traditional burial traditions, leading to local populations dying of yellow fever as frequently as those without such burial customs such as settler populations.[40]

The first modern attempts to develop a yellow fever vaccine followed the opening of the Panama Canal in 1912, which increased global exposure to the disease.[41] The Japanese bacteriologist Hideyo Noguchi led investigations for the Rockefeller Foundation in Ecuador that resulted in a vaccine based on his theory that the disease was caused by a leptospiral bacterium.[41] However, other investigators could not duplicate his results and the ineffective vaccine was eventually abandoned.[citation needed]

Another vaccine was developed from the "French strain" of the virus, obtained by Pasteur Institute scientists from a man in Dakar, Senegal, who survived his bout with the disease.[citation needed] This vaccine could be administered by scarification, like the smallpox vaccine, and was given in combination to produce immunity to both diseases, but it also had severe systemic and neurologic complications in a few cases.[42] Attempts to attenuate the virus used in the vaccine failed. Scientists at the Rockefeller Foundation developed another vaccine derived from the serum of an African named Asibi in 1927, the first isolation of the virus from a human.[43] It was safer but involved the use of large amounts of human serum, which limited widespread use.[44] Both vaccines were in use for several years, the Rockefeller vaccine in the Western hemisphere and England, and the Pasteur Institute vaccine in France and its African colonies.[45]

In 1937, Max Theiler, working with Hugh Smith and Eugen Haagen at the Rockefeller Foundation to improve the vaccine from the "Asibi" strain, discovered that a favorable chance mutation in the attenuated virus had produced a highly effective strain that was named 17D.[41] Following the work of Ernest Goodpasture, Theiler used chicken eggs to culture the virus. After field trials in Brazil, over one million people were vaccinated by 1939, without severe complications.[8] This vaccine was widely used by the U.S. Army during World War II.[46] For his work on the yellow fever vaccine, Theiler received the 1951 Nobel Prize in Physiology or Medicine.[47] Only the 17D vaccine remains in use today.[4]

Theiler's vaccine was responsible for the largest outbreak of hepatitis B in history, infecting 330,000 soldiers and giving 50,000 jaundice between 1941 and 1942.[48] At the time, chronic infectious hepatitis was not known, so when human serum was used in vaccine preparation, serum drawn from chronic hepatitis B virus (HBV) carriers contaminated the yellow fever vaccine.[49] In 1941, researchers at Rocky Mountain Laboratories developed a safer alternative, an "aqueous-base" version of the 17D vaccine using distilled water combined with the virus grown in chicken eggs.[50] Since 1971, screening technology for HBV has been available and is routinely used in situations where HBV contamination is possible including vaccine preparation.[51]

Also in the 1930s, a French team developed the French neurotropic vaccine (FNV), which was extracted from mouse brain tissue.[52] Since this vaccine was associated with a higher incidence of encephalitis, FNV was not recommended after 1961. Vaccine 17D is still in use, and more than 400 million doses have been distributed. Little research has been done to develop new vaccines. Newer vaccines, based on vero cells, are in development (as of 2018).[53][54][55]

Manufacture and global supply

[edit]

Increases in cases of yellow fever in endemic areas of Africa and South America in the 1980s were addressed by the WHO Yellow Fever Initiative launched in the mid-2000s.[56] The initiative was supported by the Gavi Alliance, a collaboration of the WHO, UNICEF, vaccine manufacturers, and private philanthropists such as the Bill & Melinda Gates Foundation.[57] Gavi-supported vaccination campaigns since 2011 have covered 88 million people in 14 countries considered at "high-risk" of a yellow fever outbreak (Angola was considered "medium risk"). As of 2013, there were four WHO-qualified manufacturers: Bio-Manguinhos in Brazil (with the Oswaldo Cruz Foundation), Institute Pasteur in Dakar, Senegal, the Federal State Unitary Enterprise of Chumakov Institute in Russia, and Sanofi Pasteur, the French pharmaceutical company.[58][59] Two other manufacturers supply domestic markets: Wuhan Institute of Biological Products in China and Sanofi Pasteur in the United States.[60]

Demand for yellow fever vaccine for preventive campaigns has increased from about five million doses per year to a projected 62 million per year by 2014.[61] UNICEF reported in 2013 that supplies were insufficient. Manufacturers are producing about 35 million of the 64 million doses needed per year.[62] Demand for the yellow fever vaccine has continued to increase due to the growing number of countries implementing yellow fever vaccination as part of their routine immunization programmes.[63]

The outbreak of yellow fever in Angola and the Democratic Republic of Congo in 2016 has raised concerns about whether the global supply of the vaccine is adequate to meet the need during a large epidemic or pandemic of the disease.[64] Routine childhood immunization was suspended in other African countries to ensure an adequate supply in the vaccination campaign against the outbreak in Angola.[65] Emergency stockpiles of vaccine diverted to Angola, which consisted of about 10 million doses at the end of March 2016, had become exhausted,[58][66] but were being replenished by May 2016.[67] However, in August it was reported that about one million doses of six million shipped in February had been sent to the wrong place or not kept cold enough to ensure efficacy, resulting in shortages to fight the spreading epidemic in DR Congo.[68] As an emergency measure, experts suggested fractional dose vaccination, using a fractional dose (1/5 or 1/10 of the usual dose) to extend existing supplies of vaccine.[69][65] Others have noted that switching manufacturing processes to modern cell-culture technology might improve vaccine supply shortfalls,[60] as the manufacture of the current vaccine in chicken eggs is slow and laborious.[70] On 17 June 2016, the WHO agreed to the use of 1/5 the usual dose as an emergency measure during the ongoing outbreak in Angola and the DR Congo.[63][71] The fractional dose would not qualify for a yellow fever certificate of vaccination for travelers. Later studies found that the fractional dose was just as protective as the full dose, even 10 years after vaccination.[72]

As of February 2021, UNICEF reported awarded contract prices ranging from US$0.97 to US$1.444 per dose under multi-year contracts with various suppliers.[73]

Travel requirements

[edit]
  Risk countries (WHO designation)
  Partial risk countries (WHO designation)
Vaccination against yellow fever 10 days before entering this country/territory is required for travellers coming from...
  All countries
  Risk countries (including airport transfers)[note 1]
  Risk countries (excluding airport transfers)[note 2]
  No requirement (risk country)[note 3]
  No requirement (non-risk country)
See also: Vaccination requirements for international travel

Travellers who wish to enter certain countries or territories must be vaccinated against yellow fever 10 days before crossing the border, and be able to present a vaccination record/certificate at the border checks.[14]: 45  In most cases, this travel requirement depends on whether the country they are travelling from has been designated by the World Health Organization as being a 'country with risk of yellow fever transmission'.[74] In a few countries, it does not matter which country the traveller comes from: everyone who wants to enter these countries must be vaccinated against yellow fever.[75] There are exemptions for newborn children; in most cases, any child who is at least 9 months or 1 year old needs to be vaccinated.[76]

Yellow fever vaccination requirements for international travel (January 2023)[76]
Country or territory Status Vaccination is required for travellers coming from Traveller age
 Albania No risk Risk countries 1 year or older
 Algeria No risk Risk countries[note 4] 1 year or older
 Angola Risk country All countries 9 months or older
 Antigua and Barbuda No risk Risk countries 1 year or older
 Argentina Risk provinces:
Misiones, Corrientes 		No[note 3] –
 Aruba No risk Risk countries[note 4] 9 months or older
 Australia No risk Risk countries[note 4] 1 year or older
 Bahamas No risk Risk countries[note 4] 1 year or older
 Bahrain No risk Risk countries[note 4] 9 months or older
 Bangladesh No risk Risk countries[note 5] 1 year or older
 Barbados No risk Risk countries 1 year or older
 Benin Risk country All countries 1 year or older
 Bolivia Risk country Risk countries 1 year or older
 Bonaire No risk Risk countries[note 4] 9 months or older
 Botswana No risk Risk countries[note 5] 1 year or older
 Brazil Risk country No[note 3] –
 Brunei No risk Risk countries[note 4] 9 months or older
 Burkina Faso Risk country All countries 9 months or older
 Burundi Risk country All countries 9 months or older
 Cabo Verde No risk Risk countries[note 4] 1 year or older
 Cambodia No risk Risk countries[note 4] 1 year or older
 Cameroon Risk country All countries 9 months or older
 Central African Republic Risk country All countries 9 months or older
 Chad Risk country Risk countries 9 months or older
 China No risk Risk countries[note 5] 9 months or older
 Christmas Island No risk Risk countries[note 4] 1 year or older
 Colombia Risk country Risk countries[note 4] 1 year or older
 Congo-Brazzaville Risk country All countries 9 months or older
 Congo-Kinshasa Risk country All countries 9 months or older
 Costa Rica No risk Risk countries 9 months or older
 Côte d'Ivoire Risk country All countries 9 months or older
 Cuba No risk Risk countries[note 4] 9 months or older
 Curaçao No risk Risk countries[note 4] 9 months or older
 Djibouti No risk Risk countries[note 4] 1 year or older
 Dominica No risk Risk countries[note 4] 1 year or older
 Dominican Republic No risk Risk countries[note 4] 1 year or older
 Ecuador Risk country Risk countries[note 4] 1 year or older
 Egypt No risk Risk countries[note 4] 9 months or older
 El Salvador No risk Risk countries[note 4] 1 year or older
 Equatorial Guinea Risk country Risk countries 9 months or older
 Eritrea No risk Risk countries 9 months or older
 Eswatini No risk Risk countries[note 5] 9 months or older
 Ethiopia Risk country Risk countries[note 4] 9 months or older
 Fiji No risk Risk countries[note 4] 1 year or older
 French Guiana Risk country All countries 1 year or older
 French Polynesia No risk Risk countries[note 4] 9 months or older
 Gabon Risk country All countries 1 year or older
 Gambia Risk country Risk countries 9 months or older
 Ghana Risk country All countries 9 months or older
 Grenada No risk Risk countries[note 4] 1 year or older
 Guadeloupe No risk Risk countries[note 4] 1 year or older
 Guatemala No risk Risk countries[note 4] 1 year or older
 Guinea Risk country Risk countries 9 months or older
 Guinea-Bissau Risk country All countries 1 year or older
 Guyana Risk country Risk countries[note 5] 1 year or older
 Haiti No risk Risk countries 1 year or older
 Honduras No risk Risk countries[note 4] 1 year or older
 India No risk Risk countries[note 5] 9 months or older
 Indonesia No risk Risk countries 9 months or older
 Iran No risk Risk countries[note 4] 9 months or older
 Iraq No risk Risk countries[note 4] 9 months or older
 Jamaica No risk Risk countries[note 4] 1 year or older
 Jordan No risk Risk countries[note 4] 1 year or older
 Kenya Risk country Risk countries 1 year or older
 Liberia Risk country Risk countries 9 months or older
 Libya No risk Risk countries 1 year or older
 Madagascar No risk Risk countries[note 4] 9 months or older
 Malawi No risk Risk countries[note 4] 1 year or older
 Malaysia No risk Risk countries[note 4] 1 year or older
 Maldives No risk Risk countries[note 4] 9 months or older
 Mali Risk country All countries 1 year or older
 Malta No risk Risk countries[note 4] 9 months or older
 Martinique No risk Risk countries[note 4] 1 year or older
 Mauritania Risk country Risk countries 1 year or older
 Mayotte No risk Risk countries[note 4] 1 year or older
 Montserrat No risk Risk countries[note 5] 1 year or older
 Mozambique No risk Risk countries[note 4] 9 months or older
 Myanmar No risk Risk countries[note 4] 1 year or older
 Namibia No risk Risk countries[note 4] 9 months or older
   Nepal No risk Risk countries[note 4] 1 year or older
 New Caledonia No risk Risk countries[note 4] 1 year or older
 Nicaragua No risk Risk countries 1 year or older
 Niger Risk country All countries 1 year or older
 Nigeria Risk country Risk countries[note 5] 9 months or older
 Niue No risk Risk countries 9 months or older
 North Korea No risk Risk countries 1 year or older
 Oman No risk Risk countries[note 4] 9 months or older
 Pakistan No risk Risk countries 1 year or older
 Panama Risk country Risk countries[note 4] 1 year or older
 Papua New Guinea No risk Risk countries[note 5] 1 year or older
 Paraguay Risk country Risk countries 1 year or older
 Peru Risk country No[note 3] –
 Philippines No risk Risk countries[note 4] 1 year or older
 Pitcairn Islands No risk Risk countries 1 year or older
 Qatar No risk Risk countries 9 months or older
 Rwanda No risk Risk countries 1 year or older
 Saint Barthélemy No risk Risk countries[note 4] 1 year or older
 Saint Helena No risk Risk countries 1 year or older
 Saint Kitts and Nevis No risk Risk countries 1 year or older
 Saint Lucia No risk Risk countries 9 months or older
 Saint Martin No risk Risk countries[note 4] 1 year or older
 Saint Vincent and the Grenadines No risk Risk countries 1 year or older
 Samoa No risk Risk countries[note 4] 1 year or older
 São Tomé and Príncipe No risk Risk countries[note 5] 1 year or older
 Saudi Arabia No risk Risk countries[note 4] 9 months or older
 Senegal Risk country Risk countries[note 5] 9 months or older
 Seychelles No risk Risk countries[note 4] 1 year or older
 Sierra Leone Risk country All countries Unknown
 Singapore No risk Risk countries[note 4] 1 year or older
 Sint Eustatius No risk Risk countries 6 months or older
 Sint Maarten No risk Risk countries 9 months or older
 Solomon Islands No risk Risk countries 9 months or older
 South Africa No risk Risk countries[note 4] 1 year or older
 South Sudan Risk country All countries 9 months or older
 Sri Lanka No risk Risk countries[note 4] 9 months or older
 Sudan Risk provinces:
South of Khartoum or Sahara Desert 		No –
 Suriname Risk country Risk countries[note 4] 1 year or older
 Tanzania No risk Risk countries[note 4] 1 year or older
 Thailand No risk Risk countries[note 4] 9 months or older
 Togo Risk country All countries 9 months or older
 Trinidad and Tobago Risk region:
Trinidad 		Risk countries 1 year or older
 Uganda Risk country All countries 1 year or older
 United Arab Emirates No risk Risk countries[note 4] 9 months or older
 Venezuela Risk country Risk countries[note 4] 1 year or older
 Wallis and Futuna No risk Risk countries[note 4] 1 year or older
 Zambia No risk Risk countries[note 4] 1 year or older
 Zimbabwe No risk Risk countries[note 4] 9 months or older
  1. ^ Also required for travellers having transited (more than 12 hours) through a risk country's airport.
  2. ^ Not required for travellers having transited through a risk country's airport.
  3. ^ a b c d The WHO has designated (parts of) Argentina, Brazil, and Peru as risk countries, but these countries do not require incoming travellers to vaccinate against yellow fever.
  4. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be bf bg bh bi Also required for travellers having transited more than 12 hours through a risk country's airport.
  5. ^ a b c d e f g h i j k Also required for travellers having transited any time through a risk country's airport.

References

[edit]
  1. ^ Use During Pregnancy and Breastfeeding
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