These data contain the output of our HIV microsimulation model of disease progression, HIV care and vertical transmission among pregnant women living with HIV in Kenya. The data can be used to reproduce Figures 2-4 and Supplementary Figures and Tables in Duarte et. al 2025. Simulated data in .csv format on the impact of viral load testing on the following outcomes for two HIV+ maternal cohorts, a Newly Positive Cohort and a Known Positive Cohort: proportions of each cohort virally suppressed overall and by treatment status, and cumulative numbers of births, deaths and vertical transmissions. A codemap translating simulation time step to maternal event time is also included.