Which condition is NOT part of the CHAT mnemonic?

The correct choice is based on the understanding of the CHAT mnemonic, which is commonly used in medical settings to aid in remembering specific conditions that could be responsible for various symptoms. The CHAT mnemonic typically includes conditions related to causing reactions or symptoms, with each letter representing a distinct condition: C for "Cellulitis," H for "Herpes," A for "Allergic," and T for "Toxic."

In this context, "Viral" is not part of the mnemonic, as it does not correspond to a specific condition represented in CHAT. While "Viral" pertains to a broad category of infections, it doesn't specify a distinct disease like the other options listed, which are directly linked to the mnemonic's purpose. Therefore, since "Viral" does not fit within the established framework of the mnemonic and the specific conditions it is meant to recall, it is considered the correct answer here.