Clinical trials
Vaccination; Infection clinical trials
Below are recruiting vaccination; infection clinical trials, each written for real people, not researchers. We’re tracking 91 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT07347002Enrolling by invitation
Observational study of chikungunya vaccine effectiveness in Brazil
This study looks at how well the VLA1553 vaccine prevents chikungunya disease in parts of Brazil where the vaccine is being offered as part of a pilot program. If you live in one of those areas and have had symptoms that might be chikungunya, this study will use your health records and blood tests to check how effective the vaccine is.
Belo Horizonte, Minas GeraisAges 18–59 - NCT07038837RecruitingPhase 4
Comparing two ways to give the R21 malaria vaccine in Chad
This study tests two ways of giving the R21 malaria vaccine to children in Chad during the rainy season. One way follows the routine vaccination schedule, and the other gives the vaccine at the same time as seasonal malaria prevention medication.
Moïssala, Mandoul RegionAges 6 months–4.9 years - NCT04875819RecruitingPhase 4
HIV vaccine safety check for meningitis and pneumonia shots
This trial studies how safe and how well the body’s immune system responds to meningococcal and pneumococcal vaccines in adults living with HIV. It may help confirm these vaccines work properly and are safe for people on HIV treatment.
HvidovreAges 18 years+ - NCT05758532RecruitingPhase 4
Modified measles vaccine schedule to help prevent allergies in babies
This study tests whether changing the measles vaccine timing in 6-month-old children can reduce allergy risk and also help protect against unrelated infections. If your child is already up to date with routine vaccines, they may be eligible for a modified measles (MMR) schedule used in the trial.
GenevaAges 6 months–6 months - NCT07600983RecruitingPhase 1/Phase 2
New pneumococcal vaccine safety and effectiveness study
This trial tests a new vaccine designed to protect against 24 types of pneumococcal bacteria (which cause pneumonia and other serious infections). Researchers are checking if it's safe and how well it works in infants, children, and adults.
ShangqiuAges 1 month+ - NCT06455852Recruiting
How well does the cholera vaccine protect you?
This study looks at how well the cholera vaccine and past infections protect people from getting cholera. It may help researchers understand who stays protected and for how long.
DhakaAges 2–80 - NCT06620185Recruiting
Flu immunity study: Vaccination and infection in lungs
This study looks at how your lungs and lymph nodes respond to flu infection and the nasal flu vaccine. It will help researchers understand how to create better protection against the flu.
LondonAges 18–55 - NCT06718127Recruiting
Study of immune response to yellow fever vaccine
This study looks at how your body's immune system responds to the yellow fever vaccine. It may help researchers understand how well the vaccine protects people.
ParisAges 18–65 - NCT06843317RecruitingPhase 1
RSV vaccine booster for older adults
This trial tests a booster dose of an experimental RSV vaccine (SCB-1019T) in healthy adults aged 60-85 who have already received the approved RSV vaccine AREXVY. The goal is to see if the booster is safe and boosts your immune system.
Phoenix, ArizonaAges 60–85 - NCT07628049RecruitingPhase 1/Phase 2
RSV and hMPV combination vaccine study for adults
This study tests a new vaccine that may protect against two common viruses that cause breathing problems, RSV and hMPV. It is for healthy younger adults (18-49) and older adults (60-80) to see if the vaccine is safe and works well.
Lenexa, KansasAges 18–80 - NCT04367883Recruiting
Study of flu shots and blood-pressure medicines in COVID
This study looks at people who were admitted to the hospital in Terrassa starting in March 2020. Researchers want to see whether having a flu vaccine and using certain blood-pressure medicines (ACE inhibitors or ARBs) is linked to how COVID infection develops.
Terrassa, BarcelonaAges Any age - NCT07414524Enrolling by invitation
Pregnancy safety study of the VLA1553 vaccine
This study follows pregnant women who received the VLA1553 vaccine (for chikungunya) to see how it affects them and their babies. It compares them to pregnant women who received a different vaccine approved during pregnancy.
Belo Horizonte, Minas GeraisAges 18 years+ - NCT06995157Recruiting
HPV infections and vaccine attitudes in Slovenian women
This observational study looks at HPV infections and women's views about the HPV vaccine in Slovenia. It aims to understand the characteristics of HPV infections and attitudes toward vaccination after the vaccine became available.
Ljubljana, Municipality of DomžaleAges Up to 35 years - NCT07555392RecruitingPhase 2/Phase 3
Chikungunya Vaccine Safety and Immune Response Study
This study tests a new vaccine to protect against chikungunya virus, a disease spread by mosquitoes that causes fever and joint pain. The study measures how well your immune system responds to the vaccine and tracks any side effects.
Guwahati, AssamAges 12–65 - NCT04486638Recruiting
Dengvaxia pregnancy registry in the US
This registry collects information about people who were pregnant and exposed to the Dengvaxia vaccine during pregnancy, to better understand outcomes after that exposure. It may help future mothers and clinicians by building a clearer safety and health record over time.
San JuanAges Any age - NCT04664556Recruiting
Study of severe pneumococcal infections in children
This study tracks cases of invasive pneumococcal disease (a serious infection) in children and newborns. It may help clinicians better understand how these infections happen and guide future prevention and treatment.
CréteilAges 1 day–18 years - NCT05553743Recruiting
Study of donated breast milk and how it affects child health
This study looks at breast milk donated for research and how it may relate to infant and child health. If you’re an adult who is breastfeeding and can donate extra milk, you may be able to participate.
San Diego, CaliforniaAges 18 years+ - NCT06650826Recruiting
Antibodies and blood clots in young adults
This study looks for certain antibodies in the blood of people aged 18 to 60 who have had a blood clot without a clear cause, or soon after an infection or vaccine, or who have had clots return despite treatment. It aims to understand why these clots happen.
BerlinAges 18–60 - NCT05655182RecruitingPhase 1/Phase 2
RSV vaccine study for infants and toddlers who may be at risk
This Phase 1/2 study tests an RSV vaccine (BLB-201) in infants and young children. It aims to see how the vaccine works and how safe it is, including in children who already have RSV antibodies or not.
La Mesa, CaliforniaAges 6 months–5 years - NCT05947071RecruitingPhase 2
Higher-dose flu vaccine versus standard dose in child transplant patients
This trial compares a higher-dose flu vaccine to the standard dose in children who recently received a kidney, heart, and/or liver transplant. It aims to see which dose better protects children against influenza while checking for safety.
Stanford, CaliforniaAges 3–17 - NCT05859490RecruitingPhase 1/Phase 2
Yellow fever vaccine study for adults with past vaccination
This trial studies how well the yellow fever vaccine “17D” stimulates the immune system (the body’s germ-fighting response) in adults who were vaccinated with 17D years ago. It may help researchers understand whether a prior vaccination still provides protection and how strong the immune response is.
Portland, OregonAges 20–49 - NCT06023056Recruiting
Hepatitis B vaccine after newborn surgery
This trial tests whether giving the hepatitis B vaccine to full-term newborns who had multiple stomach or intestine surgeries is safe and works well. It aims to protect these babies from hepatitis B infection.
Chongqing, Chongqing MunicipalityAges Any age - NCT06514547RecruitingPhase 4
Vaccine response and aging in people with HIV
This study is for people living with HIV who are 18 or older and on HIV medication. Researchers want to learn how the immune system and vaccine response change as people age, and will give a pneumococcal (pneumonia) vaccine to study that.
Minneapolis, MinnesotaAges 18 years+ - NCT06168032Recruiting
COVID-19 vaccine for lung cancer patients
This trial is testing how well the COVID-19 vaccine works for people with lung cancer to prevent another infection. It also looks at certain biomarkers in your blood that might help predict your body's immune response.
BeijingAges 18 years+
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Common questions
- Are there clinical trials for vaccination; infection?
- Yes. Clin2 currently lists 91 recruiting vaccination; infection studies from the U.S. registry, each rewritten for real people, not researchers, so you can see what it’s testing and who it’s for.
- How do I know if I qualify for a vaccination; infection trial?
- Each study lists its eligibility criteria — rules about age, diagnosis, and prior treatments. On every Clin2 trial page we explain these in words written for real people and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Does it cost anything to join a vaccination; infection trial?
- Using Clin2 is always free. Many trials cover the cost of the study treatment and related visits; some reimburse travel. The study team explains exactly what’s covered before you decide.
Related conditions
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.