Clinical trials
Vaccination clinical trials
Below are recruiting vaccination clinical trials, each written for real people, not researchers. We’re tracking 575 recruiting studies, each written for real people, not researchers, below.
Recruiting studies
- NCT05212792Recruiting
Study genes after COVID vaccine side effects
This study looks at genetic information to better understand why some people develop serious side effects after a COVID-19 vaccine, such as GBS, blood clotting with low platelets (VITT/TTS), or heart inflammation (myocarditis/pericarditis). Your information may help researchers learn who is at higher risk and improve future safety.
Vancouver, British ColumbiaAges 5–99 - NCT05183854RecruitingPhase 2
Vaccine study for CLL patients to prevent pneumococcal infections
This trial tests a series of two pneumococcal vaccines (PCV20 and PPSV23) in people with CLL-related immune weakness. It aims to see how well the vaccines work and how safe they are for preventing serious lung infections.
Salt Lake City, UtahAges 18 years+ - NCT05095701Enrolling by invitationPhase 4
Study tracks lasting protection from a live chickenpox vaccine
This trial follows people who previously took a chickenpox (varicella) vaccine to see how long their immune protection lasts. It may help explain who stays protected over time and for how long.
Xuchang, HenanAges 1–17 - NCT04664569Recruiting
Study of treatments for bacterial meningitis in children
This study enrolls children and newborns with suspected or confirmed bacterial meningitis. The goal is to understand and improve care for serious infections that affect the lining around the brain.
CréteilAges 1 day–18 years - 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 - NCT03705585RecruitingPhase 4
Check how typhoid and cholera vaccines work in adults
This study gives (or follows) typhoid and/or cholera vaccines and measures how your immune system responds. It is done in adults who are already scheduled for an upper endoscopy (EGD) and/or colonoscopy, using small tissue samples if appropriate.
Baltimore, MarylandAges 18 years+ - NCT06223568RecruitingPhase 2
Chemotherapy with or without vaccine for HPV-related throat cancer
This trial compares standard chemotherapy alone versus chemotherapy combined with an investigational vaccine (PRGN-2009) before surgery for newly diagnosed HPV-positive oropharyngeal (throat) cancer. The goal is to see if adding the vaccine improves outcomes.
Bethesda, MarylandAges 18–120 - NCT07861542RecruitingPhase 4
COVID-19 booster vaccine for older adults and high-risk people
This trial tests an updated COVID-19 booster vaccine designed to improve protection for people who are older or have health conditions that increase their risk of severe COVID-19. If you qualify, you would receive one dose of the study vaccine and be monitored for safety and immune response.
Fair Oaks, CaliforniaAges 12 years+ - NCT03132311RecruitingPhase 4
Yellow fever vaccine study for certain people with HIV
This trial checks whether a yellow fever vaccine is safe and works well in adults with HIV who have relatively healthy immune function. It may help doctors understand the best way to protect people with HIV who have never had this vaccine.
Rio de JaneiroAges 18–59 - NCT03875703Recruiting
Biology sample collection after routine vaccination
This study collects biological samples (like blood and/or other samples) after you get a routine vaccine. It helps researchers learn more about how vaccines affect the body.
CréteilAges 18 years+ - NCT03609398RecruitingPhase 2
Phase 2 study of a Rift Valley fever vaccine for safety
This study tests how safe a Rift Valley fever (RVF) vaccine is and how strongly it triggers the body’s immune response. You may be eligible if you are at risk of RVF exposure and your blood test shows you don’t already have strong protection.
Fort Deterick, MarylandAges 18–65 - NCT04871932Recruiting
Study of immune response to a COVID-19 vaccine
This trial studies how your immune system responds after a COVID-19 vaccine. It uses detailed blood tests to understand what changes happen in your immune cells and may help researchers improve future vaccines.
ShanghaiAges 18–50 - NCT05916261RecruitingEarly Phase 1
Personalized pancreatic cancer vaccines with pembrolizumab
This early-phase trial tests a personalized cancer vaccine made from your tumor, along with pembrolizumab, to help the immune system attack advanced pancreatic cancer. It may be an option if your cancer has specific immune “targets” and if you meet several health, lab, and infection requirements.
Qionghai, HainanAges 18 years+ - NCT06102837Recruiting
Tumor vaccine study for brain surgery patients
This study tests whether a tumor vaccine made from your own surgery tissue can help treat solid tumors, specifically gliomas (brain tumors). It is open to patients having brain surgery at Huashan Hospital, including those with non-tumor conditions like stroke or injury, as long as enough tissue is available.
Shanghai, Shanghai MunicipalityAges Any age - NCT06156150Recruiting
B7-H4 protein in tumor vaccine for glioma
This study looks at a protein called B7-H4 to help create a potential vaccine for glioma (a type of brain tumor). It uses a small tissue sample taken during your surgery to check if the vaccine might work for you.
Shanghai, Shanghai MunicipalityAges 18–80 - NCT05422508RecruitingPhase 2
Second chickenpox shot for healthy kids after one prior vaccine
This study gives a second chickenpox vaccine dose to healthy children who were vaccinated once before. It mainly checks safety and measures the body’s immune response to see how well the second dose works.
AnsanAges 4–6 - NCT07860047RecruitingPhase 2
Peptide vaccine with antibody therapy for prostate cancer
This trial tests a combination of a personalized peptide vaccine and an antibody therapy for men with prostate cancer that has returned after initial treatment. The goal is to see if this approach can control the cancer without needing stronger hormone therapy.
Heidelberg, Baden-WurttembergAges 18–80 - NCT06341907RecruitingPhase 2/Phase 3
Vaccine and blood test to prevent ovarian cancer return
This trial tests a personalized vaccine for people with epithelial ovarian cancer who still have a small amount of cancer DNA in their blood after surgery. The goal is to see if the vaccine can help stop the cancer from coming back.
Wenzhou, ZhejiangAges 18–70 - NCT05625633RecruitingPhase 2/Phase 3
HPV vaccine vs placebo for stubborn skin warts
This study tests whether an HPV vaccine can help shrink or clear cutaneous (skin) warts that have not responded to prior treatments. Participants get the study vaccine or a placebo to compare results and safety.
Salt Lake City, UtahAges 18 years+ - NCT05371353Recruiting
Study of how long HPV vaccine immunity lasts
This study checks how well the HPV (cancer-preventing) vaccine protection stays in your body over time. It may help confirm the vaccine’s “long-lasting” immune response and guide future vaccination confidence.
Yangchun, GuangdongAges 9–45 - NCT04706390Recruiting
Study compares immune response after COVID infection vs vaccination
This study looks at how your immune system responds after natural COVID-19 infection compared with after COVID vaccination. It may help researchers understand how well different experiences train the body’s defenses.
BergenAges 20–100 - NCT07851246RecruitingPhase 3
Flu vaccine study for adults 18 to 64
This study tests a new flu vaccine to see how well it protects adults aged 18 to 64. If you join, you'll get the vaccine and have some check-ups to see how your body responds.
Glendale, ArizonaAges 18–64 - NCT06430502Recruiting
Cancer vaccine plus immunotherapy for advanced solid tumors
This trial tests a cancer vaccine (called TTV) combined with a PD-1 inhibitor (a type of immunotherapy) for people with advanced solid tumors that have not responded to standard treatments. The goal is to see if this new combination helps shrink tumors or slow cancer growth.
Wuxi, JiangsuAges 18–85 - 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
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Common questions
- Are there clinical trials for vaccination?
- Yes. Clin2 currently lists 575 recruiting vaccination 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 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 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.