 The study found that children who received at least one combination vaccine had a higher completion rate and compliance with the full vaccine series compared to those who received only single antigen vaccines. Receipt of combination vaccine was associated with an increased likelihood of completing all recommended vaccinations, receiving all vaccinations at age appropriate times, and less than seven months under vaccinated. Therefore, combination vaccines should be encouraged among children who are under vaccinated or who received single antigen vaccines only. This article was authored by Samantha K. Karoski, Keith L. Davis, and Girishanthi Krishnaraja.