The 4 Infectious Disease Gold Standards Every FNP Student Must Master for Boards
Infectious Disease · 3 min read · October 5, 2026
Introduction
Infectious disease questions make up a massive portion of the AANP and ANCC family nurse practitioner certification exams. When you sit down for your exam, you will not just be tested on basic pathogen identification—you will need to diagnose presentations, select the right first-line antimicrobial, and recognize when a patient requires urgent referral. Let us break down four high-yield infectious disease topics that show up consistently on board exams.
1. Group A Streptococcal Pharyngitis and the Centor Criteria
Pharyngitis is a classic primary care complaint, but board examiners love to test your ability to differentiate viral pharyngitis from bacterial Group A Streptococcus (GAS). Unnecessary antibiotic prescribing is a major safety concern, which is why board exams heavily emphasize clinical decision rules like the Centor Criteria.
The modified Centor criteria include four clinical signs: fever over 38°C (100.4°F), tender anterior cervical lymphadenopathy, absence of a cough, and pharyngotonsillar exudates. If a patient scores a 3 or 4, testing via rapid antigen detection test (RADT) or throat culture is warranted before starting treatment.
Board Tip: First-line treatment for confirmed GAS pharyngitis is penicillin V or amoxicillin. For penicillin-allergic patients, use a first-generation cephalosporin (if no anaphylaxis history) or azithromycin. Remember that treating strep throat primarily prevents acute rheumatic fever, though it does not prevent acute glomerulonephritis.
2. Community-Acquired Pneumonia (CAP) Outpatient Management
When a patient walks into your clinic with a cough, fever, and new focal lung findings, community-acquired pneumonia is at the top of your differential. Knowing how to stratify healthy outpatients versus those with comorbidities is essential for safe prescribing.
For a previously healthy adult with no recent antibiotic use in the past 90 days, outpatient empiric therapy focuses on covering typical and atypical pathogens (like Mycoplasma pneumoniae).
Clinical Pearl: The outpatient first-line regimen for a healthy adult is azithromycin (a macrolide), doxycycline, or amoxicillin (high dose). However, if the patient has comorbidities (such as heart, lung, liver, or renal disease) or recent antibiotic use, use combination therapy with a respiratory fluoroquinolone (like levofloxacin) or beta-lactam plus a macrolide.
3. Lyme Disease Stages and Treatment Pearls
Vector-borne illnesses are a favorite among board question writers, and Lyme disease (Borrelia burgdorferi) is the gold standard. You must instantly recognize the hallmark skin lesion and match the correct treatment to the stage of the disease.
Early localized infection presents with erythema migrans—the classic "bull's-eye" rash—often accompanied by flu-like symptoms. If left untreated, it progresses to early disseminated (neurologic or cardiac involvement, such as AV block) and late stages (arthritis).
Board Tip: The first-line oral treatment for early localized Lyme disease in non-pregnant adults is doxycycline for 10 to 21 days. Alternatives include amoxicillin or cefuroxime. Doxycycline is contraindicated in children under 8 years old and pregnant women due to tooth staining; use amoxicillin for these populations instead.
4. Uncomplicated Urinary Tract Infections in Women
Urinary tract infections (UTIs) are a daily bread-and-butter issue in primary care, making them prime targets for board questions focusing on local resistance patterns and appropriate empiric choices.
An uncomplicated UTI in a non-pregnant premenopausal woman typically presents with dysuria, frequency, and urgency without systemic signs like flank pain or high fever.
Clinical Pearl: First-line empiric treatment for uncomplicated acute cystitis includes nitrofurantoin (Macrobid) for 5 days, trimethoprim-sulfamethoxazole (Bactrim) for 3 days (if local E. coli resistance is under 20%), or fosfomycin as a single dose. Avoid fluoroquinolones for uncomplicated UTIs whenever possible due to their black box warnings and collateral damage to the microbiome.
You have got what it takes to master these concepts and pass your boards with flying colors. Stay consistent, trust your clinical reasoning, and keep putting in the daily work.
Ready to put your knowledge to the test with board-style questions that actually mirror the exam? Head over to The FNP Review and start studying smarter today.