US consumer and healthcare professional preferences for combination COVID-19 and influenza vaccines.

Aims: To quantify preferences for an adult combination vaccine for influenza and COVID-19 (flu + COVID) compared with standalone influenza and COVID-19 vaccines.

Materials and methods: This survey study used a series of direct-elicitation questions to assess preferences for a single-shot combination flu + COVID, standalone influenza, and standalone COVID-19 vaccines among US consumers (N = 601) and healthcare professionals (HCPs) (N = 299). Response frequencies described the proportion of each sample that would prefer a flu + COVID vaccine to standalone influenza and COVID-19 vaccines. A multivariate logit regression model explored how certain characteristics influenced the odds of selecting the flu + COVID vaccine over a standalone influenza vaccine.

Results: Most consumers (398/601; 66.2%) and HCPs (250/298; 83.9%) preferred a flu + COVID vaccine to a standalone influenza vaccine. When not forced to choose between flu + COVID and standalone influenza vaccines, most consumers again selected the flu + COVID vaccine (62.3%); 14.7% would prefer separate standalone influenza and COVID-19 vaccines, 8.3% a standalone influenza vaccine only, 7.3% a COVID-19 vaccine only, and 7.4% neither vaccine. Consumers aged ≥50 years with a body mass index ≥40, those aged ≥65 years who previously received a COVID-19 vaccine, and those who had previously experienced severe impacts from influenza were more likely to choose a flu + COVID vaccine over a standalone influenza vaccine than were consumers without these characteristics. HCPs whose practice stocks high-dose influenza vaccines were more likely to choose the flu + COVID vaccine for patients aged ≥65 with no risk factors and patients aged 18-64 with ≥1 risk factor over the standalone influenza vaccine.

Limitations: Results are subject to potential hypothetical, responder, selection, and information biases.

Conclusions: Most US consumers and HCPs would likely prefer a single-shot combination flu + COVID vaccine compared with standalone influenza and COVID-19 vaccines. Given the low COVID-19 vaccination coverage rates in the US, the availability of a combination flu + COVID vaccine could help increase COVID-19 vaccine coverage.