How Long Does the Typhoid Vaccine Last — and Do You Need a Booster?

What Are the Two Types of Typhoid Vaccine and How Do They Work?

Injectable vaccine (Vi polysaccharide, brand name Typhim Vi): Contains purified components of the Salmonella Typhi bacterium. Given as a single intramuscular injection. Approved for adults and children over 2 years of age. Protective antibody levels develop within approximately 2 weeks 1Ref 1Jackson BR, Iqbal S, Mahon B; CDC (2015).Updated recommendations for the use of typhoid vaccine — Advisory Committee on Immunization Practices, United States, 2015.Booster schedules (2-year injectable, 5-year oral), vaccine types, contraindications, drug interactions, and age requirements for typhoid vaccination.

Oral vaccine (Ty21a, brand name Vivotif): Contains a live but weakened strain of Salmonella Typhi. Taken as a series of capsules — typically one capsule every other day for a total of four, completed at least one week before travel. Approved for adults and children over 6 years of age 1Ref 1Jackson BR, Iqbal S, Mahon B; CDC (2015).Updated recommendations for the use of typhoid vaccine — Advisory Committee on Immunization Practices, United States, 2015.Booster schedules (2-year injectable, 5-year oral), vaccine types, contraindications, drug interactions, and age requirements for typhoid vaccination2Ref 2Centers for Disease Control and Prevention (2023).CDC Yellow Book 2024: Health Information for International Travel.Travel health recommendations including typhoid vaccine indications, timing, and destination-specific risk assessment.

Both vaccines are substantially protective against typhoid fever, but neither provides complete protection. The bacteria can sometimes infect even a vaccinated person at sufficient exposure doses.

How Long Does Each Typhoid Vaccine Last?

Injectable Vi polysaccharide vaccine: Current ACIP and CDC recommendations state that a booster dose should be given every 2 years for travelers who remain at risk. This does not mean protection disappears abruptly at 2 years — it reflects the duration over which clinical evidence demonstrates sustained protective antibody levels. If you received this vaccine more than 2 years ago and are traveling to an area where typhoid is endemic, a booster is recommended 1Ref 1Jackson BR, Iqbal S, Mahon B; CDC (2015).Updated recommendations for the use of typhoid vaccine — Advisory Committee on Immunization Practices, United States, 2015.Booster schedules (2-year injectable, 5-year oral), vaccine types, contraindications, drug interactions, and age requirements for typhoid vaccination2Ref 2Centers for Disease Control and Prevention (2023).CDC Yellow Book 2024: Health Information for International Travel.Travel health recommendations including typhoid vaccine indications, timing, and destination-specific risk assessment.

Oral Ty21a vaccine: Revaccination — a new complete four-capsule series — is recommended every 5 years for people who remain at risk of exposure 1Ref 1Jackson BR, Iqbal S, Mahon B; CDC (2015).Updated recommendations for the use of typhoid vaccine — Advisory Committee on Immunization Practices, United States, 2015.Booster schedules (2-year injectable, 5-year oral), vaccine types, contraindications, drug interactions, and age requirements for typhoid vaccination2Ref 2Centers for Disease Control and Prevention (2023).CDC Yellow Book 2024: Health Information for International Travel.Travel health recommendations including typhoid vaccine indications, timing, and destination-specific risk assessment.

The two- and five-year figures represent population-level evidence for sustained protection, not precise individual cutoffs. If you are unsure which vaccine you received or when, a travel medicine clinician can review your records and advise.

Which Destinations Make Typhoid Vaccination Important?

Typhoid fever is endemic in many parts of the world where safe water and adequate sanitation are not universally available. High-incidence areas include South Asia (India, Pakistan, Bangladesh, Nepal), parts of Southeast Asia, sub-Saharan Africa, parts of North Africa, and parts of Latin America 3Ref 3Centers for Disease Control and Prevention (2024).India — Traveler View.High typhoid burden in South Asia including multidrug-resistant strains; strong typhoid vaccination recommendation for India travel.

South Asia carries a particularly high burden of typhoid, including strains that have developed resistance to multiple antibiotics — a reason to take vaccination and food and water precautions seriously regardless of trip length 3Ref 3Centers for Disease Control and Prevention (2024).India — Traveler View.High typhoid burden in South Asia including multidrug-resistant strains; strong typhoid vaccination recommendation for India travel. Visitors who spend time in community settings, eat at local homes, or travel in rural areas face higher exposure than those staying in international hotels.

What Does the Typhoid Vaccine Not Cover?

The typhoid vaccine is only one layer of protection. It provides no coverage against paratyphoid fever (caused by different Salmonella strains that produce a similar illness), traveler's diarrhea, hepatitis A, or cholera 1Ref 1Jackson BR, Iqbal S, Mahon B; CDC (2015).Updated recommendations for the use of typhoid vaccine — Advisory Committee on Immunization Practices, United States, 2015.Booster schedules (2-year injectable, 5-year oral), vaccine types, contraindications, drug interactions, and age requirements for typhoid vaccination.

Standard food and water precautions — drinking only safe water, avoiding raw foods from higher-risk sources, rigorous hand hygiene — remain important even if you are vaccinated. Being up to date on hepatitis A vaccination removes another significant foodborne risk for travelers to the same high-incidence regions 4Ref 4Nelson NP, Link-Gelles R, Hofmeister MG, Romero JR, Moore KL, Ward JW, Schillie SF (2018).Update: Recommendations of the Advisory Committee on Immunization Practices for Use of Hepatitis A Vaccine for Postexposure Prophylaxis and for Preexposure Prophylaxis for International Travel.Hepatitis A vaccine recommendations for international travel, particularly to the same high-incidence regions as typhoid.

What Should You Do If Your Typhoid Vaccine Has Lapsed?

For the injectable vaccine, a single booster dose given at least 2 weeks before travel is the standard approach.

For the oral vaccine, a booster means a new complete four-capsule series, finished at least one week before travel — allow at least 10 days of lead time.

An important interaction: oral antibiotics or the antimalarial proguanil (found in Malarone) taken near the time of the oral capsule series can neutralize the live vaccine. The injectable vaccine avoids this interaction entirely and may be preferred if you are also starting antimalarials 1Ref 1Jackson BR, Iqbal S, Mahon B; CDC (2015).Updated recommendations for the use of typhoid vaccine — Advisory Committee on Immunization Practices, United States, 2015.Booster schedules (2-year injectable, 5-year oral), vaccine types, contraindications, drug interactions, and age requirements for typhoid vaccination2Ref 2Centers for Disease Control and Prevention (2023).CDC Yellow Book 2024: Health Information for International Travel.Travel health recommendations including typhoid vaccine indications, timing, and destination-specific risk assessment.

The oral live vaccine is contraindicated in immunocompromised individuals — the injectable vaccine should be used in that situation 1Ref 1Jackson BR, Iqbal S, Mahon B; CDC (2015).Updated recommendations for the use of typhoid vaccine — Advisory Committee on Immunization Practices, United States, 2015.Booster schedules (2-year injectable, 5-year oral), vaccine types, contraindications, drug interactions, and age requirements for typhoid vaccination.