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Trial · NCT01511107

Efficacy of Short-Course Antimicrobial Treatment for Children With Acute Otitis Media and Impact on Resistance

NCT01511107, Phase 2, Terminated, Alejandro Hoberman; results first posted 2017-02-10

3 sourcestrials-2026-11-12-0.5.0

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ConductScience Library. Efficacy of Short-Course Antimicrobial Treatment for Children With Acute Otitis Media and Impact on Resistance. Trials, record NCT01511107. Release trials-2026-11-12-0.5.0, 12 Nov 2026. https://conductscience.org/library/trials/NCT01511107

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Trial

As registered on ClinicalTrials.gov, in the graph's capture of the registry.

Title
Efficacy of Short-Course Antimicrobial Treatment for Children With Acute Otitis Media and Impact on Resistance
NCT number
NCT01511107
Status
Terminated
Phases
Phase 2
Enrollment
520 participants, actual
Lead sponsor
Alejandro Hoberman
Conditions
Acute Otitis Media
Interventions
Amoxicillin-Clavulanate, 10 days, Amoxicillin-Clavulanate, 5 days
First posted
2012-01-18
Last updated
2017-10-06
Results first posted
2017-02-10

Source ClinicalTrials.gov

Registered outcomes22

Each outcome the trial registered, primary first, in ClinicalTrials.gov's words.

ListOutcomeTime frameDescription
PrimaryThe Distribution of Children Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment Visit Specific to the Index Episode of AOMFrom 72 hours after randomization until day 21 of the index episode. The mean day for this visit was 13.2.
Proportion of children initially diagnosed with AOM who experience treatment failure at or before the day 12-14 visit. TF is defined as substantial persistence or worsening of symptoms specifically attributable to AOM, or of otoscopic signs of AOM, after 72 hours from the time of randomization, such that additional antimicrobial therapy is deemed advisable. If a parent/legal guardian is unwilling to continue the assigned study product regimen, the participant will be categorized as TF. Should a participant be administered another systemic antibiotic while taking study medication or prior to Day 16, the participant will be considered a TF. Clinical success is defined as complete or substantial resolution of symptoms specifically attributable to AOM for 48 hours and of otoscopic signs of acute inflammation (bulging of the tympanic membrane (TM) or intense erythema), with or without persistence of middle-ear effusion, such that no additional antibiotic therapy is deemed advisable.
SecondaryThe Distribution of AOM Recurrences Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment VisitFrom 72 hours after the AOM recurrence was diagnosed until day 21 of the recurrence. The mean day for this visit was 13.3.
Proportion of AOM recurrences resulting in treatment failure at or before the day 12-14 visit. TF is defined as substantial persistence or worsening of symptoms specifically attributable to AOM, or of otoscopic signs of AOM, after 72 hours from the time of the recurrence, such that additional antimicrobial therapy is deemed advisable. If a parent/legal guardian is unwilling to continue the assigned study product regimen, the participant will be categorized as TF. Should a participant be administered another systemic antibiotic while taking study medication or prior to Day 16, the participant will be considered a TF. Clinical success is defined as complete or substantial resolution of symptoms specifically attributable to AOM for 48 hours and of otoscopic signs of acute inflammation (bulging of the TM or intense erythema), with or without persistence of middle-ear effusion, such that no additional antibiotic therapy is deemed advisable.
SecondaryThe Distribution of Children With a Nasopharyngeal (NP) Culture at Enrollment That is Negative for AOM Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible PathogenThe day 12-14 visit. The mean day for this visit was 13.3.
AOM pathogens are defined as Streptococcus pneumoniae (S pn) or Haemophilus Influenzae (H flu). In the case of S pn, susceptibility to penicillin was determined as follows: When minimum inhibitory concentration (MIC) was available, susceptible was defined as MIC \<0.1 µg/mL, intermediate as MIC 0.1 to 1 µg/mL, and resistant as MIC \>1 µg/mL. When MIC was not available, susceptible was defined as showing oxacillin disk zone size \>20 mm, intermediate as zone size 9 to 20 mm, and resistant as zone size ≤8 mm. In the case of H flu, susceptible was defined as beta-lactamase-negative and ampicillin E test MIC ≤1 µg/mL; nonsusceptible was defined as either beta-lactamase-positive or beta-lactamase-negative and ampicillin E test MIC \>1 µg/mL.
SecondaryThe Distribution of AOM Recurrences With a Nasopharyngeal (NP) Culture at Onset That is Negative for AOM Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible PathogenThe day 12-14 visit. The mean day for this visit was 13.4.
AOM pathogens are defined as Streptococcus pneumoniae (S pn) or Haemophilus Influenzae (H flu). In the case of S pn, susceptibility to penicillin was determined as follows: When minimum inhibitory concentration (MIC) was available, susceptible was defined as MIC \<0.1 µg/mL, intermediate as MIC 0.1 to 1 µg/mL, and resistant as MIC \>1 µg/mL. When MIC was not available, susceptible was defined as showing oxacillin disk zone size \>20 mm, intermediate as zone size 9 to 20 mm, and resistant as zone size ≤8 mm. In the case of H flu, susceptible was defined as beta-lactamase-negative and ampicillin E test MIC ≤1 µg/mL; nonsusceptible was defined as either beta-lactamase-positive or beta-lactamase-negative and ampicillin E test MIC \>1 µg/mL.
Secondary
The Distribution of Children With a Nasopharyngeal (NP) Culture at Enrollment That is Positive Only for One or More Susceptible Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible Pathogen
The day 12-14 visit. The mean day for this visit was 13.2.
AOM pathogens are defined as Streptococcus pneumoniae (S pn) or Haemophilus Influenzae (H flu). In the case of S pn, susceptibility to penicillin was determined as follows: When minimum inhibitory concentration (MIC) was available, susceptible was defined as MIC \<0.1 µg/mL, intermediate as MIC 0.1 to 1 µg/mL, and resistant as MIC \>1 µg/mL. When MIC was not available, susceptible was defined as showing oxacillin disk zone size \>20 mm, intermediate as zone size 9 to 20 mm, and resistant as zone size ≤8 mm. In the case of H flu, susceptible was defined as beta-lactamase-negative and ampicillin E test MIC ≤1 µg/mL; nonsusceptible was defined as either beta-lactamase-positive or beta-lactamase-negative and ampicillin E test MIC \>1 µg/mL.
Secondary
The Distribution of AOM Recurrences With a Nasopharyngeal (NP) Culture at Onset That is Positive Only for One or More Susceptible Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible Pathogen
The day 12-14 visit. The mean day for this visit was 13.9.
AOM pathogens are defined as Streptococcus pneumoniae (S pn) or Haemophilus Influenzae (H flu). In the case of S pn, susceptibility to penicillin was determined as follows: When minimum inhibitory concentration (MIC) was available, susceptible was defined as MIC \<0.1 µg/mL, intermediate as MIC 0.1 to 1 µg/mL, and resistant as MIC \>1 µg/mL. When MIC was not available, susceptible was defined as showing oxacillin disk zone size \>20 mm, intermediate as zone size 9 to 20 mm, and resistant as zone size ≤8 mm. In the case of H flu, susceptible was defined as beta-lactamase-negative and ampicillin E test MIC ≤1 µg/mL; nonsusceptible was defined as either beta-lactamase-positive or beta-lactamase-negative and ampicillin E test MIC \>1 µg/mL.
Secondary
The Distribution of Children With a Nasopharyngeal (NP) Culture at Enrollment That is Positive for One or More Nonsusceptible Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible Pathogen
The end-of-treatment visit. The mean day for this visit was 13.6.
AOM pathogens are defined as Streptococcus pneumoniae (S pn) or Haemophilus Influenzae (H flu). In the case of S pn, susceptibility to penicillin was determined as follows: When minimum inhibitory concentration (MIC) was available, susceptible was defined as MIC \<0.1 µg/mL, intermediate as MIC 0.1 to 1 µg/mL, and resistant as MIC \>1 µg/mL. When MIC was not available, susceptible was defined as showing oxacillin disk zone size \>20 mm, intermediate as zone size 9 to 20 mm, and resistant as zone size ≤8 mm. In the case of H flu, susceptible was defined as beta-lactamase-negative and ampicillin E test MIC ≤1 µg/mL; nonsusceptible was defined as either beta-lactamase-positive or beta-lactamase-negative and ampicillin E test MIC \>1 µg/mL.
Secondary
The Distribution of AOM Recurrences With a Nasopharyngeal (NP) Culture at Onset That is Positive for One or More Nonsusceptible Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible Pathogen
The end-of-treatment visit. The mean day for this visit was 13.4.
AOM pathogens are defined as Streptococcus pneumoniae (S pn) or Haemophilus Influenzae (H flu). In the case of S pn, susceptibility to penicillin was determined as follows: When minimum inhibitory concentration (MIC) was available, susceptible was defined as MIC \<0.1 µg/mL, intermediate as MIC 0.1 to 1 µg/mL, and resistant as MIC \>1 µg/mL. When MIC was not available, susceptible was defined as showing oxacillin disk zone size \>20 mm, intermediate as zone size 9 to 20 mm, and resistant as zone size ≤8 mm. In the case of H flu, susceptible was defined as beta-lactamase-negative and ampicillin E test MIC ≤1 µg/mL; nonsusceptible was defined as either beta-lactamase-positive or beta-lactamase-negative and ampicillin E test MIC \>1 µg/mL.
Secondary
The Distribution of Children Whose Nasopharyngeal (NP) Isolates at Enrollment Are Pathogen Negative or Positive Only for at Least One Susceptible Pathogen Who Become Colonized With Nonsusceptible Pathogens at Any Time Over the Course of Follow-up
Day 1 of study entry until day 365
AOM pathogens are defined as Streptococcus pneumoniae (S pn) or Haemophilus Influenzae (H flu). In the case of S pn, susceptibility to penicillin was determined as follows: When minimum inhibitory concentration (MIC) was available, susceptible was defined as MIC \<0.1 µg/mL, intermediate as MIC 0.1 to 1 µg/mL, and resistant as MIC \>1 µg/mL. When MIC was not available, susceptible was defined as showing oxacillin disk zone size \>20 mm, intermediate as zone size 9 to 20 mm, and resistant as zone size ≤8 mm. In the case of H flu, susceptible was defined as beta-lactamase-negative and ampicillin E test MIC ≤1 µg/mL; nonsusceptible was defined as either beta-lactamase-positive or beta-lactamase-negative and ampicillin E test MIC \>1 µg/mL.
SecondaryThe Distribution of 6 Week Follow-up, Non-Illness Visits During the Respiratory Season at Which a Nonsusceptible Pathogen is RecoveredDay 1 of study entry until day 244. The respiratory season is October 1 - May 31, inclusive.
AOM pathogens are defined as Streptococcus pneumoniae (S pn) or Haemophilus Influenzae (H flu). In the case of S pn, susceptibility to penicillin was determined as follows: When minimum inhibitory concentration (MIC) was available, susceptible was defined as MIC \<0.1 µg/mL, intermediate as MIC 0.1 to 1 µg/mL, and resistant as MIC \>1 µg/mL. When MIC was not available, susceptible was defined as showing oxacillin disk zone size \>20 mm, intermediate as zone size 9 to 20 mm, and resistant as zone size ≤8 mm. In the case of H flu, susceptible was defined as beta-lactamase-negative and ampicillin E test MIC ≤1 µg/mL; nonsusceptible was defined as either beta-lactamase-positive or beta-lactamase-negative and ampicillin E test MIC \>1 µg/mL.

Outcomes22

Each outcome the trial posted results for, in ClinicalTrials.gov's words.

TypeOutcomeTime framePopulationUnitsMeasured as
PRIMARYThe Distribution of Children Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment Visit Specific to the Index Episode of AOMFrom 72 hours after randomization until day 21 of the index episode. The mean day for this visit was 13.2.The analysis was intent to treat (ITT). The number of participants is equal to the number of children randomized \& eligible who had a clinical assessment at or before the day 12-14 visit.participantsNUMBER
SECONDARYThe Distribution of AOM Recurrences Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment VisitFrom 72 hours after the AOM recurrence was diagnosed until day 21 of the recurrence. The mean day for this visit was 13.3.The analysis was ITT. The number of participants is equal to the number of children randomized \& eligible who had a clinical assessment at or before the day 12-14 visit following an AOM recurrence.recurrenceNUMBER
SECONDARYThe Distribution of Children With a Nasopharyngeal (NP) Culture at Enrollment That is Negative for AOM Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible PathogenThe day 12-14 visit. The mean day for this visit was 13.3.
The analysis was ITT. The participants are randomized \& eligible children having a NP culture at enrollment that is negative for both S pn and H flu and a NP culture at the day 12-14 visit which is either positive (+) for \>=1 penicillin nonsusceptible pathogen OR pathogen negative (-) or + only for \>=1 penicillin susceptible pathogen.
participantsNUMBER
SECONDARYThe Distribution of AOM Recurrences With a Nasopharyngeal (NP) Culture at Onset That is Negative for AOM Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible PathogenThe day 12-14 visit. The mean day for this visit was 13.4.
The analysis was ITT. The participants are randomized \& eligible children having a NP culture at onset that is negative for both S pn and H flu and a NP culture at the day 12-14 visit which is either positive (+) for \>=1 penicillin nonsusceptible pathogen OR pathogen negative (-) or + only for \>=1 penicillin susceptible pathogen.
recurrenceNUMBER
SECONDARY
The Distribution of Children With a Nasopharyngeal (NP) Culture at Enrollment That is Positive Only for One or More Susceptible Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible Pathogen
The day 12-14 visit. The mean day for this visit was 13.2.
The analysis was ITT. The participants are randomized \& eligible children having a NP culture at enrollment that is positive only for \>=1 susceptible pathogen \& a NP culture at the day 12-14 visit which is either positive (+) for \>=1 penicillin nonsusceptible pathogen OR pathogen negative (-) or + only for \>=1 penicillin susceptible pathogen.
participantsNUMBER
SECONDARY
The Distribution of AOM Recurrences With a Nasopharyngeal (NP) Culture at Onset That is Positive Only for One or More Susceptible Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible Pathogen
The day 12-14 visit. The mean day for this visit was 13.9.
The analysis was ITT. The participants are randomized \& eligible children having a NP culture at onset that is positive (+) only for one or more susceptible pathogens \& a NP culture at the day 12-14 visit which is either + for \>=1 penicillin nonsusceptible pathogen OR pathogen negative (-) or + only for \>=1 penicillin susceptible pathogen.
recurrenceNUMBER
SECONDARY
The Distribution of Children With a Nasopharyngeal (NP) Culture at Enrollment That is Positive for One or More Nonsusceptible Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible Pathogen
The end-of-treatment visit. The mean day for this visit was 13.6.
The analysis was ITT. The participants are randomized \& eligible children having both a NP culture at enrollment that is positive (+) for one or more nonsusceptible pathogens \& a NP culture at the day 12-14 visit which is either + for \>=1 penicillin nonsusceptible pathogen OR pathogen negative (-) or + only for \>=1 penicillin susceptible pathogen.
participantsNUMBER
SECONDARY
The Distribution of AOM Recurrences With a Nasopharyngeal (NP) Culture at Onset That is Positive for One or More Nonsusceptible Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible Pathogen
The end-of-treatment visit. The mean day for this visit was 13.4.
The analysis was ITT. The participants are randomized \& eligible children having a NP culture at onset that is positive (+) for \>=1 nonsusceptible pathogen \& a NP culture at the day 12-14 visit which is either + for \>=1 penicillin nonsusceptible pathogen OR pathogen negative (-) or + only for \>=1 penicillin susceptible pathogen.
recurrenceNUMBER
SECONDARY
The Distribution of Children Whose Nasopharyngeal (NP) Isolates at Enrollment Are Pathogen Negative or Positive Only for at Least One Susceptible Pathogen Who Become Colonized With Nonsusceptible Pathogens at Any Time Over the Course of Follow-up
Day 1 of study entry until day 365
The analysis was ITT. The participants are randomized \& eligible children having both a NP culture at enrollment that is either pathogen negative or positive only for \>=1 susceptible pathogen and a NP culture at some time over the course of followup.
participantsNUMBER
SECONDARYThe Distribution of 6 Week Follow-up, Non-Illness Visits During the Respiratory Season at Which a Nonsusceptible Pathogen is RecoveredDay 1 of study entry until day 244. The respiratory season is October 1 - May 31, inclusive.
The analysis was ITT. The participants are randomized \& eligible children with at least one follow-up, nonillness visit, with a nasopharyngeal (NP) culture which is either positive (+) for \>=1 penicillin nonsusceptible pathogens or positive (+) only for \>=1 penicillin susceptible pathogens or pathogen negative (-).
VisitNUMBER

Results by group116

Each measurement the trial posted, group by group, in the words and numbers it posted.

OutcomeGroupCategoryValueSpreadUnits
The Distribution of Children Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment Visit Specific to the Index Episode of AOMAmoxicillin-Clavulanate, 10 DaysTreatment failure39participants
The Distribution of Children Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment Visit Specific to the Index Episode of AOMAmoxicillin-Clavulanate, 5 DaysTreatment failure77participants
The Distribution of Children Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment Visit Specific to the Index Episode of AOMAmoxicillin-Clavulanate, 10 DaysTreatment success199participants
The Distribution of Children Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment Visit Specific to the Index Episode of AOMAmoxicillin-Clavulanate, 5 DaysTreatment success152participants
The Distribution of AOM Recurrences Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment VisitAmoxicillin-Clavulanate, 10 DaysTreatment failure25recurrence
The Distribution of AOM Recurrences Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment VisitAmoxicillin-Clavulanate, 5 DaysTreatment failure29recurrence
The Distribution of AOM Recurrences Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment VisitAmoxicillin-Clavulanate, 10 DaysTreatment success108recurrence
The Distribution of AOM Recurrences Categorized as Treatment Failure (TF) at or Before the Day 12-14 End-of-Treatment VisitAmoxicillin-Clavulanate, 5 DaysTreatment success73recurrence
The Distribution of Children With a Nasopharyngeal (NP) Culture at Enrollment That is Negative for AOM Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible PathogenAmoxicillin-Clavulanate, 10 Days+ for nonsusceptible pathogen(s) day 12-1415participants
The Distribution of Children With a Nasopharyngeal (NP) Culture at Enrollment That is Negative for AOM Pathogens in Which the Follow-up NP Culture at Day 12-14 Yields a Nonsusceptible PathogenAmoxicillin-Clavulanate, 5 Days+ for nonsusceptible pathogen(s) day 12-1411participants

Participant flow6

How many started, completed or left each group, period by period.

PeriodMilestoneGroupParticipantsUnits counted
Overall StudySTARTEDAmoxicillin-Clavulanate, 10 Days260
Overall StudySTARTEDAmoxicillin-Clavulanate, 5 Days260
Overall StudyCOMPLETEDAmoxicillin-Clavulanate, 10 Days238
Overall StudyCOMPLETEDAmoxicillin-Clavulanate, 5 Days219
Overall StudyNOT COMPLETEDAmoxicillin-Clavulanate, 10 Days22
Overall StudyNOT COMPLETEDAmoxicillin-Clavulanate, 5 Days41

Adverse events44

Each adverse event the trial posted, group by group: the participants affected out of those at risk.

TypeEventOrgan systemGroupAffectedAt riskEvents
otherNon-protocol acute otitis media (AOM)Ear and labyrinth disordersAmoxicillin-Clavulanate, 10 Days4425748
otherNon-protocol acute otitis media (AOM)Ear and labyrinth disordersAmoxicillin-Clavulanate, 5 Days4825860
otherGastroenteritisGastrointestinal disordersAmoxicillin-Clavulanate, 10 Days2925731
otherGastroenteritisGastrointestinal disordersAmoxicillin-Clavulanate, 5 Days2725828
otherProtocol defined diarrheaGastrointestinal disordersAmoxicillin-Clavulanate, 10 Days84257112
otherProtocol defined diarrheaGastrointestinal disordersAmoxicillin-Clavulanate, 5 Days91258105
otherVomitingGastrointestinal disordersAmoxicillin-Clavulanate, 10 Days5425762
otherVomitingGastrointestinal disordersAmoxicillin-Clavulanate, 5 Days5125861
otherFeverGeneral disordersAmoxicillin-Clavulanate, 10 Days4425758
otherFeverGeneral disordersAmoxicillin-Clavulanate, 5 Days4225845

Adverse event totals6

The totals the trial posted for each group.

TotalGroupAffectedAt risk
Total, all-cause mortalityAmoxicillin-Clavulanate, 10 Days
Total, all-cause mortalityAmoxicillin-Clavulanate, 5 Days
Total, other adverse eventsAmoxicillin-Clavulanate, 10 Days240257
Total, other adverse eventsAmoxicillin-Clavulanate, 5 Days242258
Total, serious adverse eventsAmoxicillin-Clavulanate, 10 Days3257
Total, serious adverse eventsAmoxicillin-Clavulanate, 5 Days5258

Papers4

The papers the trial lists on ClinicalTrials.gov.

PMIDListed asSource
24911895DERIVEDPubMed
28002709DERIVEDPubMed
37171965DERIVEDPubMed
42572144DERIVEDPubMed

Grants0

The grants NIH RePORTER links to the trial, newest funded first: NIH's, and some of AHRQ's, CDC's, FDA's and VA's. Each shows its title, principal investigators, organization and funder in its newest year.

None in this release.

Trial comparisons1

Comparisons of the trial's two groups, calculated by ConductScience from the counts it posted.

Comparison
Amoxicillin-Clavulanate, 10 Days vs Amoxicillin-Clavulanate, 5 Days: serious adverse events

Tests0

The ConductCognition tests this trial's registered outcomes name, as ScienceGraph matched them in trial-tests-2026-11-12-0.2.1.

None in this release.

Data dates

The day each source was copied for this release.

ClinicalTrials.gov
2026-11-12
ClinicalTrials.gov
Results, from AACT
2026-03-23
AACT
NIH grant links
2026-11-13
NIH RePORTER

Sources 3

  • ClinicalTrials.gov's posted results, through CTTI's AACTFreely available. Acknowledgement requested
  • ClinicalTrials.govNo license stated
  • NIH RePORTER's clinical studies and project filesPublic domain
Each source's terms
  • ClinicalTrials.gov's posted results, through CTTI's AACTClinicalTrials.gov data via Aggregate Analysis of ClinicalTrials.gov (AACT), CTTI. CTTI makes its materials freely available and requests acknowledgement. https://aact.ctti-clinicaltrials.org/documentation/299
  • ClinicalTrials.govnone stated
  • NIH RePORTER's clinical studies and project filesPublic domain (NIH RePORTER)

ClinicalTrials.gov's data carry an international copyright outside the United States: https://clinicaltrials.gov/about-site/terms-conditions.

For software

Read this trial from software.

The record and each of its lists are JSON, twenty rows a page. No key.

GET https://conductscience.org/api/trials/v1/NCT01511107

GET https://conductscience.org/api/trials/v1/NCT01511107/registered?page=2