Most sore throats and sinus complaints are viral, so the whole skill is identifying the minority that are not. These questions cover applying the 4 Centor criteria, when a rapid strep test changes management, the 10-day rule that separates viral rhinosinusitis from bacterial, appropriate antibiotic selection when it is warranted, and the symptomatic care that helps everyone else. Each is written to the Family Nurse Practitioner (FNP-BC / FNP-C) board blueprint, with the reasoning laid out in full.
Question 1
A 3-year-old presents with fever, tonsillar exudate, and hepatosplenomegaly for seven days. A rapid strep test and a heterophile antibody test are both negative. Which of the following is the best diagnostic action?
- A) Reassure the parents this is simple rhinovirus
- B) Treat empirically for group A streptococcal infection
- C) Order a rapid influenza antigen detection test
- D) Order specific Epstein-Barr virus antibody titers✓
💡 Key Takeaway
Heterophile antibody tests frequently yield false negatives in children under four years old.
Show rationale
The heterophile antibody test (Monospot) has a high false-negative rate in young children. Given the classic signs of mononucleosis, including hepatosplenomegaly, you should order specific antibody titers (VCA IgM and IgG) to confirm Epstein-Barr virus. Reassuring the parents it is a simple rhinovirus ignores the significant finding of hepatosplenomegaly. Treating empirically for strep is incorrect since the rapid test is negative and strep does not cause organomegaly. Ordering an influenza test does not align with a prolonged seven-day course of exudative pharyngitis and enlarged abdominal organs.
Question 2
A 10-year-old boy reports a two-month history of intermittent congestion, itchy eyes, and frequent throat clearing that is notably worse when playing outdoors. He denies any fever.
- A) Chronic bacterial rhinosinusitis disease
- B) Seasonal allergic rhinitis presentation✓
- C) Recurrent viral respiratory infections
- D) Acute bacterial rhinosinusitis episode
💡 Key Takeaway
Intermittent congestion with itchy eyes triggered by outdoor environments without fever strongly indicates seasonal allergic rhinitis.
Show rationale
Intermittent congestion, itchy eyes, and symptoms triggered by outdoor environments strongly indicate a seasonal allergic rhinitis presentation. Chronic bacterial rhinosinusitis involves persistent purulent drainage and cough for over 90 days, lacking the specific itchy eye and outdoor trigger components. Recurrent viral respiratory infections would present with episodic fevers and acute sick contacts. An acute bacterial rhinosinusitis episode is an acute infectious process lasting less than 30 days, not an intermittent two-month issue.
Question 3
A 15-year-old reports two weeks of sore throat, low-grade fever, and marked daytime somnolence. The rapid strep test is negative, and the tonsils show thick white exudates. Which of the following is the most appropriate next step?
- A) Prescribe a course of oral azithromycin therapy
- B) Obtain a chest radiograph for atypical pneumonia
- C) Order a complete blood count with differential✓
- D) Recommend an immediate tonsillectomy for airway clearance
💡 Key Takeaway
A CBC showing atypical lymphocytosis supports the diagnosis of infectious mononucleosis in patients with prolonged fatigue.
Show rationale
Prolonged symptoms of low-grade fever, severe fatigue, and exudative pharyngitis with a negative strep test strongly suggest infectious mononucleosis. Ordering a complete blood count with differential will likely reveal atypical lymphocytosis, supporting the viral diagnosis. Prescribing azithromycin is inappropriate because antibiotics do not treat viral infections. Obtaining a chest radiograph is unnecessary as there are no lower respiratory tract symptoms mentioned. Recommending an immediate tonsillectomy is an extreme measure not indicated unless there are clear signs of impending airway compromise, which are absent here.
Question 4
A 10-year-old child is evaluated for a severe sore throat. The parent reports a fever of 101.5°F and no cough. Examination reveals swollen tonsils with tonsillar exudates. Which intervention is most appropriate for this patient?
- A) Perform a rapid antigen detection test first.✓
- B) Initiate empiric oral penicillin therapy without delay.
- C) Advise supportive care for a viral infection.
- D) Order a complete blood count with differential.
💡 Key Takeaway
High Centor scores require rapid antigen testing before initiating antibiotic therapy.
Show rationale
This child has a modified Centor score of 4, given their age, fever, lack of cough, and exudates. A high score indicates a significant probability of Group A Streptococcus, but current guidelines require a rapid antigen test to confirm the diagnosis before treating. Option B is incorrect because empiric antibiotic therapy without testing is no longer recommended due to the risk of overtreatment. Option C is unsafe because ignoring a high-risk presentation can lead to complications like rheumatic fever. Option D is unnecessary and does not differentiate viral from bacterial pharyngitis effectively.
Question 5
A 28-year-old patient presents with a sore throat, prominent cough and rhinorrhea, and a temperature of 99.1°F. Examination reveals mildly tender anterior cervical nodes but no tonsillar exudates. Based on the modified Centor criteria, which action is most appropriate?
- A) Perform a rapid streptococcal antigen test now.
- B) Prescribe a short course of oral amoxicillin.
- C) Recommend supportive care without any further testing.✓
- D) Obtain a throat culture for bacterial evaluation.
💡 Key Takeaway
A low Centor score with viral symptoms indicates supportive care without testing.
Show rationale
This patient has a modified Centor score of 1 due to tender nodes, but loses points for age and gains none for fever or exudates. The presence of a cough and rhinorrhea strongly suggests a viral etiology. Guidelines recommend supportive care without testing for scores of 0 to 1. Option A and D are incorrect because testing is not indicated for low-risk adults, which prevents unnecessary healthcare costs and false positives from colonization. Option B is inappropriate because antibiotics are not indicated without a confirmed bacterial infection, risking antibiotic resistance.
Question 6
A 46-year-old male presents with a sore throat, absence of cough, and a temperature of 100.6°F. Examination reveals tonsillar exudate and tender anterior cervical nodes. When calculating the modified Centor score to determine the need for rapid antigen testing, how should the patient's age impact the final assessment?
- A) Add one point to the score
- B) Keep the total score unchanged
- C) Subtract one point from the score✓
- D) Multiply the total score by zero
💡 Key Takeaway
The modified Centor criteria subtract one point for patients who are 45 years or older.
Show rationale
The modified Centor criteria adjust for age because the incidence of streptococcal pharyngitis decreases significantly in older adults. For a 46-year-old male, the practitioner must subtract one point from the total score. Even with the absence of cough, fever, exudate, and adenopathy, subtracting one point yields a final score of three, which still warrants testing. Adding one point applies only to children aged three to fourteen years. Keeping the total score unchanged applies to patients aged fifteen to forty-four years. Multiplying the total score by zero is never a step in this clinical scoring tool.
Question 7
A 9-year-old child presents with chronic nasal congestion, clear rhinorrhea and frequent sneezing. The physical examination reveals pale, boggy nasal turbinates and a transverse nasal crease.
- A) Viral upper respiratory tract infection
- B) Acute bacterial rhinosinusitis clinical episode
- C) Persistent seasonal allergic rhinitis presentation✓
- D) Chronic bacterial rhinosinusitis disease process
💡 Key Takeaway
Pale, boggy nasal turbinates and clear rhinorrhea are hallmark physical exam findings of allergic rhinitis.
Show rationale
The presence of pale, boggy turbinates and a transverse nasal crease strongly point to a persistent seasonal allergic rhinitis presentation. Viral upper respiratory tract infections typically present with erythematous, swollen nasal mucosa rather than pale tissues. Acute bacterial rhinosinusitis involves purulent discharge and facial pain, not clear rhinorrhea and sneezing. Chronic bacterial rhinosinusitis requires prolonged purulent drainage and cough lasting over 90 days, which does not match these allergic exam findings.
Question 8
A 3-year-old child exhibits a sudden onset of fever, drooling, and irritability. The APRN notes erythematous macules on the soles and ulcerations sparing the gingiva.
- A) Primary herpes simplex virus gingivostomatitis
- B) Classic hand, foot, and mouth disease✓
- C) Aphthous stomatitis with a viral exanthem
- D) Streptococcal pharyngitis with a scarlatina rash
💡 Key Takeaway
Gingival sparing with sole involvement differentiates hand, foot, and mouth disease from herpetic gingivostomatitis.
Show rationale
The presence of sole involvement combined with gingival sparing strongly points to classic hand, foot, and mouth disease. This viral illness typically causes painful oral ulcers while leaving the gums intact. Primary herpes simplex virus gingivostomatitis is characterized by swollen, friable gums that bleed easily, which contrasts with this child's presentation. Aphthous stomatitis with a viral exanthem causes isolated oral ulcers but does not present with the classic macular rash on the soles of the feet. Streptococcal pharyngitis with a scarlatina rash presents with exudative tonsillitis and a diffuse, sandpaper-like rash on the trunk, rather than discrete erythematous macules on the soles. Accurately identifying the specific locations of both the mucosal and cutaneous lesions allows the advanced practice nurse to establish the primary diagnosis confidently.
Question 9
A 35-year-old male presents with a severe sore throat and difficulty swallowing for two days. He reports no cough and has a temperature of 101.5°F. To accurately complete the Centor criteria assessment, the nurse practitioner must specifically palpate for which physical finding?
- A) Tender anterior cervical lymphadenopathy✓
- B) Tender posterior cervical lymphadenopathy
- C) Enlarged submandibular salivary glands
- D) Enlarged supraclavicular lymph nodes
💡 Key Takeaway
The Centor criteria specifically require the assessment of tender anterior cervical lymph nodes.
Show rationale
The Centor criteria help determine the probability of Group A streptococcal pharyngitis. The criteria include no cough, a temperature of 101.5°F or higher, tonsillar exudate, and tender anterior cervical lymphadenopathy. Palpating for tender anterior cervical lymphadenopathy is essential to accurately calculate the score. Assessing for tender posterior cervical lymphadenopathy is useful for suspecting mononucleosis but is not part of the Centor score. Checking for enlarged submandibular salivary glands or enlarged supraclavicular lymph nodes does not contribute to the Centor criteria and would not guide the decision for rapid strep testing.
Question 10
A 14-year-old patient presents with a sore throat, fever, and tender cervical adenopathy, yielding a Centor score of 3. Clinic staff perform a negative rapid antigen test. What is the most appropriate next step in management?
- A) Prescribe oral amoxicillin for suspected bacterial infection.
- B) Recommend supportive care assuming a viral etiology.
- C) Administer intramuscular penicillin to prevent rheumatic fever.
- D) Obtain a backup throat culture for confirmation.✓
💡 Key Takeaway
Children and adolescents with a negative rapid antigen test require a backup throat culture.
Show rationale
In children and adolescents, a negative rapid test must be followed by a throat culture because they are at a higher risk for developing rheumatic fever from missed Group A Streptococcus infections. Option B is incorrect; while adults with a negative screen can be treated symptomatically, pediatric guidelines mandate culture confirmation. Options A and C are incorrect because initiating antibiotics after a negative rapid test without culture confirmation violates antimicrobial stewardship principles. You must wait for the culture results before prescribing antibiotics in this scenario.
