Final answer:
Negative RIDT test results do not rule out influenza virus. John's prognosis depends on several factors including the severity of his illness and the antibiotic therapy.
Step-by-step explanation:
Answer:
Negative results from a Rapid Influenza Diagnostic Test (RIDT) do not absolutely rule out influenza virus as the cause of illness. This is because the sensitivity of RIDT can vary, and false negatives can occur. Therefore, a negative RIDT result should be interpreted in the context of the patient's clinical presentation and other diagnostic tests.
John's prognosis would depend on various factors, including the severity of his illness, timely initiation of appropriate antibiotic therapy, and his overall health. With the addition of levofloxacin to his treatment and continuous monitoring by his doctor, he has a better chance of recovering from the infection caused by Legionella pneumophila.