Which of the following is NOT a risk factor for infections among the elderly?

Alzheimer's disease is primarily a neurodegenerative disorder that affects cognitive function, memory, and behavior. While it can have implications for an individual's overall health and well-being, it is not inherently a direct risk factor for infections in the same way that malnutrition, diminished immune response, and advanced age are.

Malnutrition can weaken the body's defenses, making an individual more susceptible to infections. A diminished immune response is a well-documented consequence of aging, leading to an increased risk of illnesses, including infections. Advanced age itself is associated with a higher prevalence of chronic conditions and a decreased ability to respond to pathogens effectively.

In contrast, Alzheimer’s disease may complicate care and increase the risk of issues like aspiration pneumonia due to swallowing difficulties, but it does not directly compromise the immune system or nutritional status in the way that the other factors do. Thus, while Alzheimer's disease poses challenges, it is not classified as a direct risk factor for infections among the elderly.