181dbf4c_of_Health__Victoria__Australia__Research_findings
[Egg facts] There is no way of knowing whether there are bacteria in or on an egg. Clean eggs are less likely to be contaminated. Refrigeration slows bacterial growth. Thorough cooking kills bacteria. [Research findings] 
54% of respondents believe an egg is safe to eat if it doesn’t float in water, 36% think egg yolk colour indicates safety, and 73% think an egg is OK as long as it doesn’t smell bad.
Research: Eggs need TLC - Department of Health, Victoria, Australia
Research findings