Healthy volunteers · Sioux City, IA
Studies for healthy volunteers in Sioux City, IA
3 recruiting studies have a site in Sioux City.
3 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
Studies
- RecruitingHealthy volunteersPhase 4
Study of a Recombinant Spike COVID-19 Vaccine With Matrix-M in Older Adults and People at Increased Risk of Severe COVID-19
Sanofi
- Location
- Sioux City, IA + 19 other US sites
- Eligibility basics
- Ages 12+
- RecruitingHealthy volunteersPhase 3
A Study to Assess the Safety, Tolerability, and Immunogenicity of 3 Lots of a Multivalent Pneumococcal Conjugate Vaccine Administered to Adults
Pfizer
- Location
- Sioux City, IA + 36 other US sites
- Eligibility basics
- Ages 18–49
- RecruitingHealthy volunteersPhase 3
A Study to Learn About a Clostridioides Difficile Vaccine in People 65 Years of Age and Older
Pfizer
- Location
- Sioux City, IA + 138 other US sites
- Eligibility basics
- Ages 65+
Who these studies look for
“Healthy” is decided at screening, not by you. Sites usually check vital signs, blood and urine tests, an ECG, your medications and sometimes your BMI or smoking status. A study can still turn you away for reasons that have nothing to do with being unwell, such as timing or a full roster.
Matching a page like this one never means you qualify. Each research team decides eligibility at screening.