What is the first sign of infection in the elderly?

• A. Fever
• B. Cough
• C. Rash
• D. Confusion

Answer: (D)

In older adults, infections often present in ways that aren’t typical for younger people. The fever response can be blunted with aging, so a high temperature isn’t as reliable a clue as it is in younger patients. Instead, the brain can be affected early, leading to a sudden change in mental status such as confusion or delirium. This pattern is especially common with common infections like urinary tract infections or pneumonia, where fever may be absent or subtle.

Cough or rash can occur, but they’re not as consistently present as a mental status change when an infection is taking hold in the elderly. So, a new onset of confusion in an older person should raise concern for an infection (along with other potential triggers like dehydration, medications, or metabolic issues) because it reflects the typical atypical presentation seen in aging.