After reviewing the search results, it appears that there is no clear definition or explanation of "prec infection." The term "preinfection" is defined as an infection that is established in the body but not yet clinically manifested. However, the term "prec infection" does not appear to be a recognized medical term or condition.

Some of the search results are related to infections or viruses, such as precore/core region mutations of hepatitis B virus and pre-infection COVID vaccination. However, these are not specifically related to a condition called "prec infection."

One search result discusses "precum," which is a fluid that is released from the penis during sexual arousal before ejaculation. Precum can contain sperm and may increase the risk of pregnancy and sexually transmitted infections. However, this is not related to a medical condition called "prec infection."

In summary, there is no clear definition or explanation of "prec infection" in the search results. It is possible that this term is a misspelling or a non-medical term. If more information is needed, it may be helpful to provide additional context or clarification about the term.