3Cs-Based counseling sharply improved vaccine uptake in COPD outpatients
A hospital-led 3Cs vaccine hesitancy intervention raised influenza and pneumococcal vaccination rates among adults with chronic obstructive pulmonary disease, while also reducing reluctance to be vaccinated. The program combined health promotion materials with a “vaccine health prescription,” and it was delivered through respiratory outpatient physicians working with public health departments. In a condition where respiratory infections can trigger exacerbations, accelerate functional decline, and drive avoidable hospital use, vaccination is not a peripheral preventive measure. It is part of day-to-day COPD risk management.
The trial enrolled adults seen in the respiratory outpatient department of Guizhou Provincial People’s Hospital between June 2025 and January 2026. Eligible participants were 18 years or older, met COPD diagnostic criteria with post-bronchodilator FEV1/FVC below 0.70, were permanent residents of Guiyang, and had indications for influenza vaccine, pneumococcal polysaccharide vaccine, or both. Patients with vaccine contraindications, those unable or unwilling to complete the questionnaire, and those already vaccinated against influenza in 2025 or pneumococcus during 2021 to 2025 were excluded. Of 265 initially enrolled patients, 9 were lost to follow-up, leaving 256 for analysis, split evenly between intervention and control groups.
The intervention was anchored in the 3Cs framework: confidence, complacency, and convenience. Confidence addresses trust in vaccine safety, efficacy, clinicians, and the health system. Complacency reflects the belief that infection risk is low or that vaccine-preventable illness is not serious enough to justify action. Convenience captures the practical friction of getting vaccinated, including access, cost, location, and process complexity. Those three domains map closely to the reasons many COPD patients remain unvaccinated even when they meet clear indications.
In practical terms, the intervention group received vaccine education designed around those barriers and was also recommended a vaccine health prescription for influenza vaccine and pneumococcal polysaccharide vaccine. The control group did not receive those measures. Investigators then repeated the questionnaire by telephone one month after enrollment and verified actual vaccination status through the vaccination service system within six months after enrollment. The design links belief change to real-world uptake rather than relying on intention alone.
The results were straightforward. Post-intervention, influenza vaccine hesitancy was lower in the experimental group than in the control group, with 21 of 128 patients hesitant versus 45 of 128. Pneumococcal vaccine hesitancy followed the same pattern, with 31 of 128 versus 60 of 128. Vaccination rates moved in the opposite direction: 54 of 128 in the intervention arm received influenza vaccination compared with 12 of 128 in controls, and pneumococcal coverage within the previous five years was 42 of 128 versus 12 of 128.
Those shifts matter because COPD patients live with a narrow margin for respiratory insult. Influenza and pneumococcal infections can inflame already vulnerable airways, worsen mucus burden, destabilize symptoms, and precipitate exacerbations that often lead to emergency care or admission. A counseling model that reduces hesitation and improves uptake therefore has implications beyond immunization statistics alone. It can interrupt a common chain of events in which a preventable infection becomes a destabilizing respiratory episode.
Why the 3Cs framework worked at the bedside
This trial’s value lies in how directly it translated behavioral theory into clinic workflow. Respiratory physicians delivered the intervention inside a care setting where COPD patients already had contact with clinicians they trusted. That structure likely strengthened confidence in the recommendation, while the prescription format turned vaccination from an abstract public health suggestion into a concrete clinical action. The approach also reduced convenience barriers by embedding advice in a system that could connect patients to vaccination services.
The 3Cs model is useful because it does not treat vaccine refusal as a single problem. A patient may distrust vaccine safety, may underestimate the danger of influenza or pneumococcal disease, or may simply struggle with access. A generic reminder rarely solves all three. By contrast, a tailored intervention can address the psychological and logistical reasons vaccination stalls in chronic disease populations. In COPD, where long-term disease control depends on preventing avoidable exacerbations, that precision is especially relevant.
One sentence captures the operational meaning of the data: vaccination increased when counseling moved from passive advice to structured clinical prescription. The follow-up strategy also strengthens the report, because vaccination status was checked through the service system rather than resting only on self-report. That makes the observed gains more credible in routine practice, where memory and optimism often overstate preventive care completion.
The study has a clear behavioral message for respiratory clinics, especially where vaccine uptake remains low despite established indications. A coordinated model involving disease-control personnel and outpatient physicians can improve patient understanding of vaccine need and convert that understanding into action. The intervention did not rely on new drugs, complex technology, or prolonged follow-up. It used targeted education, a clinician-endorsed prescription, and a framework built around known barriers to acceptance.
Several limitations remain embedded in the design. The cohort came from a single hospital, the sample size was modest, and follow-up extended only to the short term for questionnaire reassessment, with vaccination verification over six months. The report does not establish whether the intervention lowers COPD exacerbations, hospitalizations, or mortality. It also does not separate which of the three 3Cs contributed most to the change, so the relative weight of confidence, complacency, and convenience remains undefined. Even so, the trial shows that a structured, clinic-based vaccination strategy can materially change preventive behavior in a high-risk respiratory population.