Yes, a follow-up on the CRP level would give an idea about the status of the infection: if it is dropping, this should indicate an improvement; an elevation usually means worsening, but only within clinical context. But let me reassure you: a low-grade fever (below 38.5 degrees Celsius) that is self-limited (dropping on its own without the aid of anti-pyretics) is a good and reassuring sign; it means the body's immune system is almost finished with clearing out the infection. Doing a urine test would further assert that no hidden infection exists.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.