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The correct choice highlights an essential understanding of infections and their transmission. Infections can sometimes be present without obvious symptoms, which means a person may not exhibit any signs of illness yet still harbor the bacteria or virus that can be transmitted to others. This concept is particularly important in public health and safety, as it indicates that individuals can spread infections even when asymptomatic.

In contrast, the other options present an inaccurate portrayal of how infections operate. While some infections can indeed cause severe symptoms or lead to medical emergencies, this is not universally applicable. Additionally, the idea that infections never include symptoms like fever or fatigue is incorrect, as these are commonly recognized signs of infection. Understanding the variability of infection symptoms significantly impacts how we approach health, treatment, and preventive measures.