Final answer:
The client is likely experiencing the prodromal stage of infection, characterized by general signs and symptoms of illness. This stage is followed by the period of illness, during which symptoms are most severe.
Step-by-step explanation:
The client is likely experiencing the prodromal stage of infection. During this stage, the pathogen continues to multiply in the host and the client begins to experience general signs and symptoms of illness, such as generalized aches and fever. These symptoms are typically too general to indicate a specific disease. Following the prodromal stage is the period of illness, during which the signs and symptoms of disease are most obvious and severe.