One elderly patient has died and 550 people have been sickened in a major salmonella outbreak caused by tainted salmon.  The Dutch National Institute for Public Health and the Environment said in a statement Saturday tests have confirmed one death and another fatality is under investigation.  The institute announced earlier this month that the outbreak had been traced to Dutch company Foppen and ordered its products pulled off shelves at stores across the Netherlands.  Costco Wholesale Corp., which sells Foppen products in the United States, also recalled salmon products.  The CDC announced 85 Salmonella Thompson cases, but did not link the illnesses to the salmon.