Table III.

Closure rates in outbreaks stratified by the source of the outbreak (Outbreak Database, N = 1561)

Source	Total no. of outbreaksa	Outbreaks including some kind of closure	Closure rate	P-value
Patient	395	66	16.7%	0.03
Environment	194	24	12.4%	NS
Medical devices	172	12	7.0%	0.04
Personnel	154	17	11.0%	NS
Drugs	73	3	4.1%	0.03
Food	50	1	2.0%	0.03
Equipment for patient care	35	5	14.3%	NS
Source not known	518	80	13.8%	NS
Total	1561	194	12.4%	–

NS, not significant.

^aMultiple answers possible.