(PL38) A CALL-BACK PROTOCOL INCREASES MPOX VACCINE SERIES COMPLETION

Background:
A 2-dose series of the mpox vaccine JYNNEOS assures a higher protection rate than a single dose.  Prior to the intervention, individuals in Michigan who received the mpox vaccine had a 66% completion rate of the full series.   The Michigan Department of Health and Human Services wanted to increase full series completion via patient education and appointment navigation.

Methods:
An analysis of the immunization registry identified 2,973 individuals who had received a single dose of vaccine.  A team of DIS with experience in COVID-19 contact tracing and gonorrhea follow-up were assigned the cases and collaborated to develop a script, education materials, and vaccine navigation appointment resources.  Of the 2,973 individuals identified, 2,239 were called and 1,308 (58%) were successfully reached.

Results:
348 of the 1,308 persons reached indicated they had already received two doses and were fully vaccinated.  This was due to a variety of reasons and data was cleaned in the immunization registry (out of state vaccination, name variations, etc.).  25 individuals reported mpox infection after receiving first dose and/or having received the smallpox vaccine as part of their routine childhood immunizations, negating need for second dose.  751 individuals (~57%) reported willingness to get the second dose, and approximately 184 individuals were not interested in completing the two-dose series.

Conclusion:
A mpox vaccine call-back protocol contributed to cleaner immunization data and patient education for those who could be vulnerable to mpox infection can be integrated into routine DIS workflows.     A call-back protocol can also identify valuable information regarding the need for patient education and barriers clients are facing accessing services.  Further evaluation should be conducted to assess the outcome of complete vaccination for the clients who self-reported they would follow-up for their second dose.