Diagnosis and Management

Clinical Assessment

Problem 1 - Upper Respiratory Tract Infection (URTI) / Acute Pharyngitis

Problem 2 - Lower Urinary Tract Infection (UTI) / Urethritis/Cystitis

Differential Diagnosis

For the Respiratory Complaint:

1. History of fever - +1
2. Absence of cough - cough IS present, so 0
3. Tender anterior cervical lymphadenopathy - unknown from history
4. Tonsillar exudate or swelling - unknown from history

• Harrison's Principles of Internal Medicine 22E, p. 301

For the Urinary Complaint:

Important note in young sexually active males: The European Association of Urology (EAU) guidelines recommend obtaining both midstream urine and first-voided urine. For young sexually active men, initial treatment should cover both Chlamydia trachomatis and Enterobacterales.

Investigations

For Respiratory:

• Throat swab / Rapid Antigen Detection Test (RADT) for Group A Streptococcus
• If mononucleosis suspected: Monospot test (heterophile antibody), CBC (look for atypical lymphocytosis > 4000/µL or >50% relative lymphocyte count)
• Nasopharyngeal swab for influenza if clinically indicated

For Urinary:

• Urinalysis (dipstick): pyuria (>10 WBC/HPF), nitrites, leukocyte esterase
• Urine culture and sensitivity (midstream clean catch): mandatory in males - UTI in a male is considered "complicated" by default
• First-voided urine + NAAT (nucleic acid amplification test): for Chlamydia and Gonorrhea in a sexually active young male
• Urine microscopy
• Consider renal function tests if systemic involvement suspected

General:

• CBC: elevated WBC may suggest bacterial infection
• ESR, CRP: markers of inflammation
• Blood culture if pyelonephritis or systemic sepsis is suspected

Management

Symptomatic (Both Conditions):

• Analgesic/antipyretic: Paracetamol (Acetaminophen) 500-1000 mg every 6-8 hours OR Ibuprofen 400 mg TDS with food
• Hydration: Oral fluids - at least 2-3 liters/day (helps flush the urinary tract and reduces dark concentrated urine)
• Rest: Adequate bed rest for weakness and fever
• For throat: Saline gargles, lozenges, honey with warm water or tea, soft foods - Harrison's 22E
• For dysuria: Phenazopyridine (urinary analgesic, 200 mg TDS x 2 days) can provide symptomatic relief while awaiting antibiotic effect

Antibiotic Therapy:

For UTI in Males (important - requires longer course):

• Add Azithromycin 1 g single dose (for Chlamydia)
• Add Ceftriaxone 500 mg IM single dose (for Gonorrhea)
• Or Doxycycline 100 mg BID x 7 days as alternative for Chlamydia

For Pharyngitis:

Note: Unlike most infections where shorter courses are trending, GAS pharyngitis specifically requires 7-10 days for effectiveness. - Harrison's 22E, p. 301

Red Flags - When to Escalate Care

• Fever not responding after 48-72 hours of treatment
• Neck swelling, difficulty swallowing, drooling (peritonsillar abscess)
• Flank/loin pain, rigors, high fever - suggests pyelonephritis
• Hematuria (blood in urine), urinary retention
• Signs of sepsis (hypotension, tachycardia, confusion)
• Persistent symptoms >5 days without improvement

Summary Plan

IMMEDIATE:
1. Urinalysis + urine C&S (midstream + first-voided for STI NAAT)
2. RADT for GAS pharyngitis
3. CBC, CRP
4. Start ORS/hydration, paracetamol for fever

SHORT-TERM:
5. If UTI confirmed → 10-14 day antibiotic course (TMP-SMZ or Ciprofloxacin)
6. If GAS confirmed → Penicillin V x 10 days
7. If STI suspected → Ceftriaxone + Azithromycin
8. Symptomatic relief (gargles, lozenges, phenazopyridine)

FOLLOW UP:
9. Review in 48-72 hours or sooner if worsening
10. Urine test of cure after antibiotic completion (in males)

Clinical note on dark yellow urine: This likely reflects both dehydration (concentrated urine) and active UTI-related pyuria. Aggressive oral hydration should be started immediately alongside antibiotics. If urine remains dark brown/cola-colored after hydration, check for hematuria or myoglobinuria.