In recognition of Prof Marshall's research leadership, she was awarded 2023 SA Scientist of the Year, 2022 SA Australian of the Year and 2022 SA Woman of the Year. In 2021 she was made a Fellow of the Australian Academy Health and Medical Sciences and was a Finalist for SA Scientist of the Year. Previously, she was awarded the South Australia Science Award for Excellence in Research Collaboration in 2019, Research for the Public Good in 2010, and a national Public Health Association of Australia Fellowship in 2013. Her research was included in the NHMRC “10 of the best” research projects for 2016. She was the recipient of the Australia Day Council, Inspiring South Australian Women Award in 2020.

Professor Marshall’s research program addresses urgent priorities in infectious disease prevention in children and includes implementation research and clinical trials in investigational and licensed vaccines, infectious and social epidemiology and public health. Her main interests include meningococcal, human papillomavirus, influenza and pertussis infections and their prevention by immunisation. Professor Marshall has been an investigator on 108 implementation, clinical and epidemiological studies. Professor Marshall’s research group, VIRTU, is the only research centre in Australia using social science research methodologies to investigate community attitudes to the introduction of new vaccines. She was awarded a NHMRC Career Development Fellowship (CDF) in 2011, a NHMRC CDF(2) in 2015 an NHMRC Practitioner Fellowship from 2019-2023, and an NHMRC Investigator Grant from 2025-2029.

Since 2004, Prof Marshall has published over 230 peer-reviewed papers in high quality general medicine and specialist journals across diverse disciplines with individual paper citations > 8,000. Her h-index = 57 and i10-index is 189. She has been awarded 17 NHMRC (CIA x 7, including 3 Fellowships), ARC, Government, Foundation and Industry grants totalling >$36 million.