1400. Physician Attitudes towards Combination Vaccine Use in Infants up to 24 months of age in the United States (US)
Authors: Chen Ya-Ting , Ng Xinyi , Petigara Tanaz , Aggarwal Jyoti , Bhaloo Jenna , Goveia Michelle , Johnson David , Marshall Gary S 
Published: January 2021

Abstract

Background
Combination vaccines reduce the number of injections and improve the timeliness of vaccination coverage. US Advisory Committee on Immunization Practices (ACIP) recommendations state that combination vaccines are generally preferred over equivalent individual component vaccines. Healthcare providers strongly influence parental decisions about vaccination. We sought a contemporary understanding of physician’s attitudes towards combination vaccine use in infants.

Methods
We conducted an online survey of US physicians (70 pediatricians and 30 family practitioners) who administer vaccines to infants aged 0-24 months and spend at least 2 days a week providing patient care. Information was collected on attitudes towards combination vaccines and factors that influence the choice of combination vaccine used in clinical practice. Descriptive analyses were performed.

Results
Physicians (mean age=50.2 years, range 30.0-70.0; 66% white; 37% women) reported a median of 4 injections (range 2-9) as the maximum that parents would accept at a single visit, and 71% routinely explained what combination vaccines are to parents. When deciding which pentavalent vaccine to use, physicians considered how the brand fits into the current vaccine schedule (71%); upfront purchase costs (64%); and availability as a prefilled syringe (61%). The main reasons for using combination vaccines were to reduce the number of injections (96%); ensure the infant is up-to-date with vaccinations (86%); and reduce the pain that the infant experiences with multiple injections (68%). More than half reported that their institution or practice has a program to incentivize infant vaccination according to schedule. If a hexavalent vaccine-based schedule was available, 76% of physicians said they would choose it over their current schedule comprising pentavalent or equivalent component vaccines.

Conclusion
Choice of pentavalent combination vaccine among pediatricians and family practitioners was largely dependent on convenience and cost-related factors. Over three-quarters would be inclined to use a hexavalent vaccine schedule if available.

Disclosures
Ya-Ting Chen, PhD, Merck & Co., Inc. (Employee, Shareholder) Xinyi Ng, PhD, Merck & Co., Inc. (Consultant) Tanaz Petigara, PhD, Merck & Co., Inc. (Employee, Shareholder) Jyoti Aggarwal, MHS, Merck & Co., Inc. (Consultant) Jenna Bhaloo, MPH, Merck & Co., Inc. (Consultant) Michelle Goveia, MD, Merck & Co., Inc (Employee, Shareholder) David Johnson, MD, MPH, Sanofi Pasteur (Employee, Shareholder) Gary S. Marshall, MD, GlaxoSmithKline (Consultant, Scientific Research Study Investigator)Merck (Consultant, Scientific Research Study Investigator)Pfizer (Consultant, Scientific Research Study Investigator)Sanofi Pasteur (Consultant, Grant/Research Support, Scientific Research Study Investigator, Honorarium for conference lecture)Seqirus (Consultant, Scientific Research Study Investigator)