Implementation gaps (cold chain failures, missing brigade roles, fractured coordination) are often the hidden reason vaccination campaigns fail. A PLoS study published 10 July 2026 evaluated the fidelity of the September 2021 rabies vaccination campaign across 17 health centers in southern Cercado (Cochabamba, Bolivia) and found consistent operational shortfalls that kept coverage below elimination thresholds. In this post for researchers and program teams, we show how an AI-enabled qualitative analysis workflow turns the study's mixed-methods data (27-point checklist; 46 ETD interviews; 108 pet-owner interviews) into prioritized, reproducible fixes you can operationalize in weeks. See the original report on PLOS Neglected Tropical Diseases: PLOS Neglected Tropical Diseases.
Key Takeaways
The PLoS 2026 fidelity study found that none of the 17 assessed health centers met the 80% adherence threshold for campaign content, and the principal barriers were infrastructural and organizational rather than technical.
Evidano is an AI-powered qualitative data analysis platform that consolidates documents and transcripts, automates transcription and translation, and accelerates thematic and cross-segment analysis to produce prioritized, evidence-backed action briefs.
- None of 17 first-level health centers reached the 80% content adherence threshold, content adherence ranged 32%–79%.
- Study design: mixed methods with a conservative 27-point checklist, 46 ETD interviews, 108 pet-owner interviews, and COREQ reporting; study published 10 July 2026.
- Repeatable operational failures identified include inadequate cold chain (13/17 lacked refrigerators), incomplete brigades (15/17), damaged coolers (8/17), and fragmented communications.
- A two-week operational pilot can reproduce the Cochabamba diagnostic workflow: ingest documents, auto-transcribe and translate, run thematic coding, then generate stakeholder-ready action plans.
Fast take: What the PLoS study found
The PLoS study found that operational failures, not lack of clinical knowledge, explained low campaign fidelity across 17 health centers in Cochabamba.
A mixed-methods fidelity assessment (Carroll plus CFIR) of the 2021 municipal rabies campaign in southern Cercado shows that none of 17 health centers met the 80% adherence threshold for campaign content; barriers were largely infrastructural and organizational, not technical.
- Study published: 10 July 2026; campaign evaluated: September 2021; data collection: late 2022.
- Quantitative and qualitative design: 27-point checklist; 46 ETD interviews; 108 pet-owner interviews; COREQ reporting.
- Principal operational barriers: inadequate cold chain, incomplete brigades, weak ETD–OTB coordination, fragmented communications, limited veterinary sector involvement.
Read the full article on PLOS Neglected Tropical Diseases: PLOS Neglected Tropical Diseases. If you are mapping implementation problems across documents and interview transcripts, Evidano can accelerate coding, cross-segment comparison, and evidence extraction: Evidano.
Findings snapshot (Cercado, Bolivia, quick numbers)
| Date / Metric | Value | Source / Note |
|---|---|---|
| Study published | 10 July 2026 | PLOS NTDs article |
| Campaign evaluated | September 2021 (municipal mass campaign) | Retrospective audit |
| Health centers assessed | 17 first-level centers | 27-point checklist |
| Overall content adherence | Range 32%–79%; none ≥80% | Documentary verification |
| Coverage (adequate) | 70.6% (12/17) | Vaccine availability + postcampaign continuity |
| Frequency (adequate) | 82.4% (14/17), abstract summary | Four frequency subcomponents |
| Duration (adequate) | 64.7% (11/17), abstract summary | 8-hour daily session target |
| Cold chain gaps | 76.5% lacked refrigerators (13/17) | Content subitems |
| Incomplete brigades | 88.2% (15/17) missing channelers or roles | Operational constraint |
| Damaged coolers | 47.1% (8/17) | Logistics & vaccine integrity risk |
| Qual data | 46 ETD interviews; 108 pet-owner interviews | CFIR-guided thematic analysis |
What happened, methods, limits, and why it matters
This section explains the study's methods, key limitations, and why operational fixes matter for vaccination campaign fidelity.
The authors applied Carroll's fidelity framework (content, coverage, frequency, duration) using a conservative 27-item checklist, scoring any item without documentary evidence as NO.
- Binary YES/NO scoring prioritized verifiable actions over self-report, useful for accountability but conservative for partial compliance.
- Triangulation combined documentary review, interviews, and geospatial mapping to align reported coverage with catchment boundaries.
- Practical implication: failures were repeatable, predictable operational issues (cold chain, staffing, coordination), not missing clinical knowledge, meaning implementers can fix these with targeted logistics and governance changes.
The study's limitations include retrospective documentary verification, which may undercount undocumented activities, a study-specific checklist not externally validated, and purposive sampling for interviews, which provides qualitative insight but not population prevalence.
Implications for implementers and researchers
Program managers (municipal & departmental)
Program managers should prioritize cold chain resilience, formal coordination, and veterinary sector integration to improve campaign fidelity.
Prioritize cold chain resilience via thermotolerant vaccines, passive coolers, and prepositioned insulated carriers.
Formalize ETD–OTB coordination using written joint plans and shared monitoring, and systematize the WhatsApp groups already in use.
Integrate veterinary associations as co-responsible partners to improve technical quality and community trust.
Implementation researchers & evaluators
Implementation researchers should pair measurement and explanation frameworks and publish scoring rubrics for comparability.
Use Carroll plus CFIR as a paired measurement and explanation toolkit for campaign fidelity and document scoring rubrics to enable comparability across sites.
Collect documentary evidence prospectively where possible and consider graduated scoring (fully, partially, not met) for nuance.
Publish checklists and coded transcripts (with consent) to enable meta-analyses of fidelity drivers across regions.
Communications & UX teams
Communications teams should launch culturally tailored messaging early, offer appointment options, and measure message reach versus reported awareness.
Launch culturally tailored messaging at least one month before campaigns in Spanish and Quechua and use school-based channels to reach households where children care for pets.
Design appointment and evening or weekend options and door-to-door notifications to reach working and migrant families.
Measure message reach and behavior change (clicks or attendance versus reported awareness) and iterate quickly.
Do more, faster with Evidano (map to the Cochabamba use case)
Problem: scattered documents and inconsistent records
Evidano consolidates scattered campaign documents and records into a single searchable corpus for automated evidence audits.
Solution: Ingest vaccination registries, meeting minutes, WhatsApp logs, and PDFs into Evidano to produce a single searchable corpus and automated evidence audit.
Problem: dozens of interview transcripts in Spanish/Quechua
Evidano automates transcription, translation, and PII redaction to prepare transcripts for rapid analysis.
Solution: Auto-transcription and translation with custom dictionaries (technical terms, local place names) and PII redaction to prepare transcripts for analysis in hours, not weeks.
Problem: identifying repeatable barriers across centers
Evidano surfaces high-impact operational failures via thematic coding, frequency analysis, and cross-segment comparisons.
Solution: Thematic coding plus frequency analysis and cross-segment comparisons (for example, by health center, zone, or OTB) to surface the highest-impact operational failures such as cold chain, staffing, and communications.
Problem: unclear recommendations for managers
Evidano produces AI-assisted synthesis, one-page decision memos, and visual outputs that map problems to actions and stakeholders.
Solution: AI-assisted synthesis produces evidence-backed briefs and one-page decision memos; visual outputs (co-occurrence networks, hierarchical codes to subcodes) map problems to suggested actions and stakeholders.
Security & compliance
Evidano uses encrypted storage and proprietary models tuned for qualitative research and does not use your data to train third-party models.
Evidano uses encrypted storage and proprietary models tuned for qualitative research, your data is not used to train third-party models. Learn more at Evidano.
2-week pilot checklist (from raw data to action)
This checklist explains the two-week run-book to reproduce the Cochabamba diagnostic in your context.
- Day 0–1: Collect campaign documents, registries, WhatsApp logs, and audio files; create a manifest spreadsheet.
- Day 1–3: Bulk ingest into Evidano; run auto-transcription and apply a custom dictionary for local place names and technical terms.
- Day 3–5: Run automated thematic coding; produce top 10 emergent barriers and frequency by center.
- Day 5–7: Cross-segment analysis (for example, by zone, community type, brigade composition) to prioritize interventions.
- Day 7–10: Generate stakeholder briefs and visualizations (word cloud, co-occurrence network, hierarchical code tree).
- Day 10–14: Schedule targeted AI-avatar follow-up interviews to fill specific gaps (for example, reasons for incomplete brigades) and rerun analyses with new data.
- Deliverable at Day 14: One-page action plan with ranked interventions and an estimated resource list.
Ethics note
This ethics note reminds readers to secure consent and protect PII when handling transcripts and health records.
This post discusses public-health program evaluation and is non-diagnostic. When handling interview transcripts and health records, secure informed consent and apply PII redaction; Evidano supports PII redaction in transcriptions.
FAQ: vaccination campaign fidelity
What did the PLoS study of Cochabamba find about campaign fidelity?
The study found that none of the 17 assessed health centers met the 80% adherence threshold for campaign content and identified repeatable operational failures.
The study reported content adherence ranging 32% to 79% and documented principal barriers including inadequate cold chain, incomplete brigades, weak ETD–OTB coordination, fragmented communications, and limited veterinary sector involvement.
Which methods did the study use and what are its main limitations?
The study used a conservative 27-point Carroll checklist, CFIR-guided interviews, and COREQ reporting, with key limitations tied to retrospective documentation and purposive sampling.
The study scored items binary (YES/NO) based on documentary evidence, triangulated documents with interviews and geospatial mapping, and noted limitations including possible undercounting of undocumented activities and a study-specific checklist not yet externally validated.
What operational barriers should implementers prioritize first?
Implementers should prioritize cold chain resilience, complete brigade staffing, and improved coordination and communications.
The study highlights cold chain gaps (13/17 lacked refrigerators), incomplete brigades (15/17), and damaged coolers (8/17) as high-impact, fixable operational issues.
How can teams reproduce the Cochabamba diagnostic quickly?
Teams can reproduce the diagnostic by ingesting documents and audio, auto-transcribing and translating, running thematic coding, and generating stakeholder briefs within a two-week pilot.
The two-week pilot checklist provided here outlines collecting records, bulk ingest, automated transcription, thematic coding, cross-segment analysis, and a deliverable one-page action plan at Day 14.
How does Evidano support this kind of fidelity analysis?
Evidano consolidates multi-format inputs, automates transcription and translation with custom dictionaries, runs thematic and cross-segment analyses, and generates briefs and visuals for operational planning.
Evidano ingests registries, meeting minutes, messaging logs, and transcripts, supports PII redaction, and outputs evidence-backed decision memos and visualizations to map problems to stakeholders and actions.
Conclusion, turn diagnosis into durable fixes
The PLoS 2026 fidelity study of Cochabamba's 2021 rabies campaign shows that vaccines work, but delivery systems often do not, and targeted operational fixes can close that gap.
The mixed-methods diagnosis (27-point checklist and CFIR interviews) highlights repeatable operational failures (cold chain, staffing, coordination, and communications) that implementers can fix with targeted investments and standardized processes.
If you analyze transcripts, campaign documents, or stakeholder messages, Evidano can collapse weeks of synthesis into days: ingest documents and spreadsheets, automate transcription and translation, run thematic and cross-segment analyses, and produce stakeholder briefs and visuals ready for operational planning. Try Evidano for free.
Original study: PLOS Neglected Tropical Diseases.