Final answer:
The patient's symptoms most likely suggest a diagnosis of infectious mononucleosis, often caused by the Epstein-Barr virus. Symptoms like marked fatigue and posterior cervical lymphadenopathy are characteristic of this condition, and a Sure-Vue Mono Test can confirm the diagnosis.
Step-by-step explanation:
Based on the signs and symptoms presented, which include gradual onset of low-grade fever, marked fatigue, severe sore throat, and posterior cervical lymphadenopathy, the condition most likely causing these symptoms is infectious mononucleosis (Epstein-Barr virus). Infectious mononucleosis, commonly caused by the Epstein-Barr virus, is characterized by symptoms including fatigue, fever, sore throat, and swollen lymph nodes. It is particularly known for the severe fatigue it causes, which can linger for several months. Infectious mononucleosis is primarily transmitted through direct contact with body fluids, such as saliva, which is often referred to as the 'kissing disease.'
While some of these symptoms could also be consistent with other conditions such as streptococcal pharyngitis (strep throat) or influenza, the presence of posterior cervical lymphadenopathy and the pattern of symptoms suggest mononucleosis is the more likely diagnosis. The Sure-Vue Mono Test, which detects antibodies to EBV, can be used to confirm the diagnosis of infectious mononucleosis.