Other drug names:	A-Am  An-Az  B  C-Ch  Ci-Cz  D-Dh  Di-Dz  E  F  G  H  I-J  K-L  M-Mh  Mi-Mz  N-Nh  Ni-Nz  O  P-Pl  Pm-Pz  Q-R  S-Sn  So-Sz  T-To  Tp-Tz  U-V  W-Z  0-9

In the U.S.—

YF-Vax

• Immunizing agent, active

Yellow Fever Vaccine is used to prevent infection by the yellow fever virus. It works by causing your body to produce its own protection (antibodies) against the virus.

Vaccination against yellow fever is recommended for all persons 9 months of age and older who are traveling to or living in areas of Africa, South America, or other countries where there is yellow fever infection and for people who are traveling to countries that require yellow fever immunization (certificate of vaccination). It is also needed by other people who might come into contact with the yellow fever virus.

Infants 6 to 9 months of age and pregnant women should be vaccinated only if they must travel to areas where there is an epidemic of yellow fever and they cannot be protected from mosquito bites.

Infants 4 to 6 months of age may be vaccinated only if there is a high risk of getting yellow fever infection.

Vaccination against yellow fever is not recommended for infants younger than 4 months of age because they have an increased chance of getting serious side effects from the vaccine.

The certificate of vaccination for yellow fever is valid for 10 years beginning 10 days after the first vaccination, or on the date of the second vaccination if within 10 years of the first injection.

Yellow fever vaccine is given only at authorized Yellow Fever Vaccination Centers. The location of these centers can be obtained from your state, province, and local health departments.

The vaccine is available in the following dosage form:

Parenteral
• Injection (U.S. and Canada)

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For yellow fever vaccine, the following should be considered:

Allergies—Tell your doctor if you have ever had any unusual or allergic reaction to yellow fever vaccine. Also tell your doctor if you are allergic to any other substances, such as foods (especially eggs and chicken), preservatives, or dyes. The yellow fever vaccine available in the U.S. and Canada is grown in chick embryo cell culture so it may contain egg or chicken protein.

If you are allergic to eggs or chicken, your doctor may have to do a skin test before giving you the vaccine. However, if you need the vaccine because of international travel requirements, not because you are traveling to a country where there is a high risk of getting yellow fever, you may ask your doctor for a waiver letter stating the reason why you cannot be vaccinated.

Pregnancy—Yellow fever vaccine may cause birth defects. Therefore, it is not recommended for use in pregnant women, especially in the first 3 months of pregnancy, unless they are at high risk of getting yellow fever. Pregnant women who have not already been immunized are generally advised to postpone their travel and vaccination until after giving birth.

If travel to high-risk areas cannot be postponed, pregnant women should be vaccinated. The chance of getting serious problems from infection with yellow fever in those areas is much greater than the chance of getting a serious side effect from the vaccine for both the mother and the fetus.

However, a pregnant woman who needs the vaccine because of international travel requirements, not because she is traveling to a country where there is a high risk of getting yellow fever, may ask the doctor for a waiver letter (official-looking on letterhead stationery) stating why she cannot be vaccinated.

Breast-feeding—Yellow fever vaccine has not been shown to cause problems in nursing babies.

Children—Yellow fever vaccine is recommended for children 9 months of age or older if they are traveling to, or living in, areas where there is yellow fever infection, or if they are traveling to areas that require yellow fever immunization (certificate of vaccination). In special cases, such as high-risk exposure, yellow fever vaccine may be given to children 4 to 9 months of age. However, the vaccine is not recommended for infants younger than 4 months of age, because of an increased chance of serious side effects.

Other medicines—Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. Before you receive yellow fever vaccine, it is especially important that your doctor know if you have received any of the following:

• Treatment with x-rays or medicines that may lower the body's protection against infection such as those used for organ transplants (e.g., cyclosporine), cancer medicines, or corticosteroids—May decrease the useful effect of yellow fever vaccine

Other medical problems—The presence of other medical problems may affect the use of yellow fever vaccine. Make sure you tell your doctor if you have any other medical problems, especially:

• Immune deficiency condition (or family history of)—The condition may decrease the useful effect of the vaccine or may increase the risk and severity of side effects

• Serious illness with fever—The symptoms of the illness may be confused with the possible side effects of the vaccine

Along with its needed effects, a vaccine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Get emergency help immediately if any of the following side effects occur:

• Rare
  • Confusion;  convulsions (seizures);  coughing;  difficulty in breathing or swallowing;  fast heartbeat;  feeling of burning, crawling, or tingling of skin;  nervousness or irritability;  reddening of skin;  severe headache;  skin rash or itching ;  sneezing;  stiff neck;  throbbing in the ears;  unusual tiredness or weakness;  vomiting 
  
  

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:

• Less common
  • Low fever;  mild headache;  muscle pain;  pain at place of injection  
  
  

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.

Developed: 11/22/1993