Which of these is NOT a characteristic of an Interstate Health Certificate (IHC)?

The correct understanding centers on the validity period of an Interstate Health Certificate (IHC). An IHC is indeed limited in time, but it's worth noting that its validity is not 45 days following issuance. Generally, the IHC is valid for a shorter duration, often around 30 days, depending on specific regulations, and this can vary. Therefore, the option stating that it is valid for 45 days does not align with the standard practices surrounding IHCs, making it the correct choice for the question regarding characteristics that are NOT applicable to the certificate.

In contrast, the other options highlight essential aspects of the IHC. Firstly, it is not used for exporting animals out of the U.S. since that purpose falls under different regulations. Secondly, the IHC must be endorsed after completion to authenticate that all requirements have been met. Finally, it does include numerous details and regulations regarding the health status and treatment of the animals being transported, ensuring compliance with interstate trade standards.