雑菌

1. Origins, structure, and basic meaning

• Structure: 雑菌(ざっきん) refers to miscellaneous germs present in the surroundings or mixed in where they are unwanted.
• Basic usage: The examples discuss germs on a cutting board or kept out of a wound from a hygiene perspective.

2. Common pitfalls and similar expressions

• A different basis from 細菌
  • 細菌(さいきん) names a biological category, bacteria. 雑菌 expresses the presence of unwanted germs in a particular situation rather than naming a specific species.