Final answer:
In stage I of Lyme disease, a client should be assessed for flu-like symptoms, including malaise, headache, fever, and muscle stiffness, along with the possible presence of a bull's-eye rash.
Step-by-step explanation:
The client diagnosed with stage I of Lyme disease should be assessed for flu-like symptoms, which are characteristic of this early stage. These symptoms include malaise, headache, fever, and muscle stiffness, often accompanied by a distinctive bull's-eye rash known as erythema migrans, occurring at the site of the tick bite.
Stage I is known as the early localized stage and occurs soon after the initial infection. It's essential to recognize these symptoms early for prompt treatment to prevent progression to later, more serious stages of the disease.