In the 1980s, del Val began working at the , a research institute at the UAM jointly run by the university and the CSIC. She then spent three years at the
University of Ulm. del Val returned to Spain in the 1990s, having developed an experimental vaccine design based on isolated T-cell epitopes. Afterwards, del Val stayed abroad at the
National Institutes of Health in
Bethesda, Maryland and
McGill University in
Montreal, before spending twenty years at the
Carlos III Health Institute. In April 2020, del Val helped set up and launch the
Salud Global ("Global Health") program, a CSIC project facilitating
COVID-19 research between over 300 Spanish research groups. del Val has provided her thoughts on Spain's experience with the COVID-19 pandemic == Selected publications ==