Grannell 2020.

Study characteristics
Study design	Mathematical modelling study Description: two region SEIR model for the Island of Ireland Standard four compartments are used (susceptible, exposed, infected, and recovered) Model accounts for interaction between the border regions of Ireland and Northern Ireland
Disease	COVID‐19
Travel‐related control measure(s)	Border closure  Closing of border from the first day of the epidemic for international travelers Date of implementation: first day of the epidemic
Country implementing the measure(s)	Country protected by the measure: Ireland and Northern Ireland Country restricted by the measure: Ireland and Northern Ireland
Outcome(s)	Shift in epidemic development due to the measure Outcome 1: days to epidemic peak Outcome 2: Proportion of population infected at peak Follow‐up: n.r.
Notes	COI: n.r. Funding: n.r.