A relevant study published by Yoonie Sim & Elizabeth Watts et al. on the value of immunization as an investment.
http://dx.doi.org/10.1377/hlthaff.2020.00103 HEALTH AFFAIRS 39,NO. 8 (2020): 1343–1353
ABSTRACT Estimating the value of global investment in immunization programs is critical to helping decision makers plan and mobilize immunization programs and allocate resources required to realize their full benefits. We estimated economic benefits using cost-of-illness and value-of-a-statistical-life approaches and combined this estimation with immunization program costs to derive the return on investment from immunization programs against ten pathogens for ninety-four low- and middle-income countries for the period 2011–30. Using the cost-of-illness approach, return on investment for one dollar invested in immunization against our ten pathogens was 26.1 for the ninety-four countries from2011 to 2020 and 19.8 from 2021 to 2030. Using the value-of-a-statistical life approach, return on investment was 51.0 from 2011 to 2020 and 52.2from 2021 to 2030. The results demonstrate continued high return on investment from immunization programs. The return-on-investment estimates from this study will inform country policy makers and decision makers in funding agencies and will contribute to efforts to mobilize resources for immunization. Realization of the full benefits of immunization will depend on sustained investment in and commitment to immunization programs.