ClinicalTrials.gg
Sign In

Diphtheria clinical trials

The registry lists 267 studies for Diphtheria across more than 10 countries. 17 are recruiting or about to start. 142 of them are mainly about Diphtheria (how this is decided). Per ClinicalTrials.gov, last updated 2026-10-26.

Get an email when these change. Save the Diphtheria studies recruiting or about to start — once a week, free: studies that open, close, add sites or post results.

Watch these studies
See an example email

Example · made-up studies

Breast cancer · Recruiting: 2 came in, 3 changed

What changed in your saved searches, Oct 31 – Nov 6:

A study of drug A after surgery for early breast cancer

Came in · now Recruiting

Drug B with hormone therapy in advanced breast cancer

Changed

· Sites: 4 added, including Seoul and Busan

· Enrollment: 300 → 450 participants

Exercise during chemotherapy

Now Active, not recruiting

One email a week for all your saved searches. Stop any time.

Status

Completed
226
Status unknown
11
Recruiting
10
Not yet recruiting
7
Active, not recruiting
7
Terminated
4

Phase

Phase 3
128
Phase 4
58
Phase 2
37
Phase 1
18

Where

United States
47
China
27
Canada
17
Philippines
16
Korea, Republic of
16
Germany
14

Who runs them

GlaxoSmithKline (101) · Sanofi Pasteur, a Sanofi Company (62) · Sanofi (18) · Merck Sharp & Dohme LLC (7) · CanSino Biologics Inc. (7) · LG Chem (7) · National Institute of Allergy and Infectious Diseases (NIAID) (5) · Crucell Holland BV (3)

What is being tested here

Drugs under test in Diphtheria studies, those with the most open studies first. Medicines only given beside them are not counted. How drugs are counted

DrugOpenPhase 3All
Boostrix31020
Pentavac159
Adacel0719
Diphtheria-tetanus-acellular pertussis-inactivated poliovirus-Haemophilus influenzae b conjugate-hepatitis B vaccine0715
Diphtheria-Tetanus-Pertussis Vaccine079
Diphtheria-tetanus-five component acellular pertussis-inactivated poliomyelitis -Haemophilus influenzae type b conjugate vaccine077
GSK2202083A004
V419044
Heptavalent Pneumococcal Conjugate Vaccine044
DTaP-IPV-HB-PRP-T vaccine033

Coming up

8phase 3 studies under way
4studies finish main data collection within a year1 of them phase 3

Studies recruiting or running, from their records. “Main data collection” ends at the primary completion date, the sponsor’s own estimate, which often moves.

All 4, phase 3 first

Who these studies take

Of the 10 Diphtheria studies recruiting now, 2 (20%) set no upper age limit and 8 (80%) stop at 75 or younger. 6 (60%) take children under 18. 2 (20%) are for women only and 0 (0%) for men only; 9 (90%) take healthy volunteers.

Recruiting studies that take each age, of 10
AgeWomenMen
101 (10%)1 (10%)
183 (30%)1 (10%)
305 (50%)3 (30%)
405 (50%)3 (30%)
504 (40%)3 (30%)
652 (20%)1 (10%)
752 (20%)1 (10%)
852 (20%)1 (10%)

Across all 267 studies, recruiting or not: 86% stop at 75 or younger and 85% at 65; 83% take children; 5% are for women only and <1% for men only; 96% take healthy volunteers. From each study’s registry entry; the criteria on its page decide.

How long Diphtheria studies take

Of 46 phase 3 interventional studies under Diphtheria, half reached primary completion within 13 months of starting, counting those still running.

Start to primary completionEvery sponsorIndustryNon-industry
Phase 313 mo7–21 · 46 studies13 mo7–21 · 46 studies—
Phase 422 mo8–30 · 21 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 12, 2026.

Newly registered2

Studies

Recruiting first, then most recently updated. Showing 50 of 267. Browse all 267 → or search them.