It is still unclear what caused the outbreak linked to two separate conferences at the museum last week.
"We cannot currently point to a specific dish or food. We are also looking broadly in case a virus has entered the business," says Maria Pihlajärvi of Linköping Municipality's (municipal government) food unit to Corren.
Some staff at the Air Force Museum's restaurant, which operates separately but works closely with the museum, are also reported to have fallen ill after working near the conference guests.
Following a decision by the municipality, the museum was closed on Monday and will remain closed on Tuesday. The Air Force Museum regrets the incident, and the restaurant has carried out extra cleaning.