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Vaccination Refusal clinical trials

The registry lists 64 studies for Vaccination Refusal across more than 10 countries. 4 are recruiting or about to start. 18 of them are mainly about Vaccination Refusal (how this is decided). Per ClinicalTrials.gov, last updated 2026-10-13. Counting its narrower condition Vaccination Hesitancy too: 161 studies, 15 open.

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Status

Completed
41
Status unknown
10
Active, not recruiting
4
Withdrawn
3
Recruiting
3
Not yet recruiting
1

Phase

Phase 4
1

Where

United States
29
Turkey
6
Hong Kong
4
Canada
3
Malaysia
2
China
2

Who runs them

Chinese University of Hong Kong (3) · Geisinger Clinic (2) · Meharry Medical College (2) · Charles Drew University of Medicine and Science (2) · University of Utah (2) · University of Pennsylvania (2) · Stanford University (2) · Johns Hopkins Bloomberg School of Public Health (2)

Who these studies take

Of the 3 Vaccination Refusal studies recruiting now, 2 (67%) set no upper age limit and 1 (33%) stop at 75 or younger. 2 (67%) take children under 18. 0 (0%) are for women only and 0 (0%) for men only; 2 (67%) take healthy volunteers.

Recruiting studies that take each age, of 3
AgeWomenMen
102 (67%)2 (67%)
182 (67%)2 (67%)
302 (67%)2 (67%)
402 (67%)2 (67%)
502 (67%)2 (67%)
652 (67%)2 (67%)
752 (67%)2 (67%)
852 (67%)2 (67%)

Across all 64 studies, recruiting or not: 14% stop at 75 or younger and 14% at 65; 33% take children; 8% are for women only and 2% for men only; 84% take healthy volunteers. From each study’s registry entry; the criteria on its page decide.

How long Vaccination Refusal studies take

Of 44 interventional studies with no phase under Vaccination Refusal, half reached primary completion within 7 months of starting, counting those still running.

Start to primary completionEvery sponsorIndustryNon-industry
Interventional, no phase7 mo1–14 · 44 studies—7 mo1–14 · 44 studies

Each figure is the month by which half the studies had reached primary completion, with the range in which the middle half did. Studies still running count until their last registry update; studies that stopped early are left out. Phase 1 includes early phase 1; observational means prospective or not stated, as retrospective and cross-sectional studies date a window of data rather than a study. How these figures are worked out

What changed recently

From the registry's own updates since Oct 13, 2026.

Started recruiting1

Studies

Recruiting first, then most recently updated. Showing 50 of 64. Browse all 64 → or search them.