What indicates that raw shell eggs are unsafe to use?

Raw shell eggs are considered unsafe to use when there are signs of dirty or broken shells. The integrity of the eggshell plays a crucial role in protecting the contents inside from contaminants like bacteria, particularly Salmonella. A dirty shell may indicate that the egg has come into contact with fecal matter or other pathogens that can lead to foodborne illnesses. Additionally, broken shells compromise the egg's protective barrier, allowing microorganisms to enter and contaminate the egg.

In contrast, a clean shell suggests that the egg was handled properly and is less likely to be contaminated. A cool temperature is important for storage but does not necessarily indicate safety regarding the shell's integrity. Similarly, a firm texture is typical of a fresh egg and does not provide information about its safety concerning shell cleanliness or condition. Thus, recognizing dirty or broken shells is vital for ensuring the safety of raw shell eggs.