According to a recent study:

• 29% of patients with health care-associated infections were readmitted to the hospital, compared with 16.5% of those who did not develop an HAI
• 9.3% of total bed days were linked to excess length of stay due to an HAI
•  11.4% of total costs were due to excess length of stay
• The 1-year overall mortality rate for patients with an HAI was 1.75, compared to all other patients

Source: "Direct health care costs and length of hospital stay related to health care-acquired infections in adult patients based on point prevalence measurements," American Journal of Infection Control, abstract only, March 14, 2016, http://www.ajicjournal.org/article/S0196-6553(16)00140-1/abstract