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The treatment for septic arthritis requires an adequate drainage of purulent joint fluid and appropriate antimicrobial therapy. Empiric therapy should be started after the collection joint fluid and blood sample, and these should be send for culture.

Empiric Therapy Adapted from Lancet 375:846, 2010.

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▸  Pediatric   ▸  Newborns (< 1 week)   ▸  Newborns (1 -4 week)   ▸  Infants (1 - 3 months)   ▸  Children (3 mo - 14 yr)   ▸  Adults   ▸  Acute Monoarticular   ▸  Chronic Monoarticular   ▸  Polyarticular

Newborn (< 1 week) Preferred Regimen High suspicion of MRSA ▸ Vancomycin 18 mg/kg IV divided q12h PLUS ▸ Cefotaxime 50 mg/kg IV q12h Low suspicion of MRSA ▸ Nafcillin 25 mg/kg q8h OR ▸ Oxacillin 25 mg/kg q8h PLUS ▸ Cefotaxime 50 mg/kg IV q12h Alternative Regimen ▸ Clindamycin 5mg/kg q8h Newborn (1 - 4 weeks) Preferred Regimen High suspicion of MRSA ▸ Vancomycin 22 mg/kg q12h PLUS ▸ Cefotaxime 50 mg/kg IV q8h Low suspicion of MRSA ▸ Nafcillin 37 mg/kg q6h OR ▸ Oxacillin 37 mg/kg q6h PLUS ▸ Cefotaxime 50 mg/kg IV q8h Alternative Regimen ▸ Clindamycin 5mg/kg q6h Infants (1- 3 months) Preferred Regimen High suspicion of MRSA ▸ Vancomycin 40 mg/kg/day divided q6-8h PLUS ▸ Cefotaxime 50 mg/kg IV q8h Low suspicion of MRSA ▸ Nafcillin 37 mg/kg q6h (max 8-12 g/day) OR ▸ Oxacillin 37 mg/kg q6h (max 8-12 g/day) PLUS ▸ Cefotaxime 50 mg/kg IV q8h Alternative Regimen ▸ Clindamycin 7.5mg/kg q6h Children (3 mo - 14 yr) Preferred Regimen ▸ Vancomycin 40 mg/kg/day IV q6-8h PLUS ▸ Cefotaxime 50 mg/kg IV q8h Alternative Regimen ▸ Linezolid 10 mg/kg IV q8h OR ▸ Clindamycin 7.5 mg/kg IV q6h PLUS ▸ Aztreonam 30 mg/kg IV q6h Acute Monoarticular Preferred Regimen At risk for Gonococcal infection ▸ Ceftriaxone 1 g IV q24h OR ▸ Cefotaxime 1 g IV q8h OR ▸ Ceftizoxime 1 g IV q8h Not at risk for Gonococcal infection ▸ Vancomycin 15-20 mg/kg IV q8-12h PLUS ▸ Ceftriaxone 1g IV q24h OR ▸ Cefepime 2g IV q8h Alternative Regimen (If not at risk for Gonococcal infection) ▸ Vancomycin 15-20 mg/kg IV q8-12h PLUS ▸ Ciprofloxacin 400 mg IV q12h OR ▸ Levofloxacin 750 mg IV q24h Chronic Monoarticular Empirical therapy is not recommended. Treatment should be addressed for the specific etiology Polyarticular Preferred Regimen ▸ Ceftriaxone 1 gm IV q24h

CSF Gram Stain-Based Therapy Adapted from Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases

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Gram-Positive   ▸  Gram-Positive Cocci Gram-Negative   ▸  Gram-Negative Cocci   ▸  Gram-Negative Rods   ▸  Negative Gram Stain

Gram-Positive Cocci Preferred Regimen ▸ Vancomycin 15-20 mg/kg IV q8—12h (trough 15—20 μg/mL) Alternative Regimen (For patients allergic to vancomycin) ▸ Linezolid OR ▸ Daptomycin Gram-Negative Cocci Preferred Regimen ▸ Ceftriaxone 1 g IV q24h Gram-Negative Rods Preferred Regimen ▸ Ceftazidime 2 g IV q8h OR ▸ Cefepime 2g IV q12h OR ▸ Piperacillin-Tazobactam 4.5 g q6h OR ▸ Imipenem 500 mg IV q6h OR ▸ Meropenem 1 g IV q8h Alternative Regimen (For patients allergic to cephalosporins) ▸ Aztreonam 2 g q8h OR ▸ Ciprofloxacin 400 mg IV q12h OR ▸ Levofloxacin 750 mg IV q24h Negative Gram Stain Preferred Regimen ▸ Vancomycin 15-20 mg/kg IV q8—12h PLUS ▸ Ceftazidime 2 g IV q8h Alternative Regimen ▸ Ciprofloxacin 750 mg IV q12h OR ▸ Levofloxacin 750 mg IV q24h OR ▸ Tobramycin OR ▸ Gentamycin 5-7 mg/kg once daily or 5 mg/kg divided in 3 doses/day

Pathogen-Based Therapy — Bacteria Adapted from

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Bacteria   ▸  Staphylococcus aureus   ▸  Staphylococcus epidermidis   ▸  Streptococcus groups A, B, C, G   ▸  E. coli   ▸  Pseudomonas aeruginosa   ▸  Neisseria gonorrhoeae   ▸  Haemophilus influenzae   ▸  T. whipplei Mycobacteria   ▸  Mycobacterium tuberculosis Spirochetes   ▸  Borrelia burgdorferi   ▸  Treponema pallidum

Staphylococcus aureus, Methicillin sensitive Preferred Regimen ▸ Nafcillin 1.5-2 g IV q4h OR ▸ Oxacillin 1.5-2 g IV q4h OR ▸ Cefazolin 1 g IV q8h Alternative Regimen ▸ Dicloxacillin 500 mg PO q6h' OR ▸ Cephalexin 500 mg PO q6h OR ▸ Clindamycin 300 mg PO q8h OR ▸ TMP-SMX 160-800 mg PO q12h Staphylococcus aureus, Methicillin resistant Preferred Regimen ▸ Vancomycin 15-20 mg/kg IV q8-12h Alternative Regimen ▸ Daptomycin 6 mg IV qd OR ▸ Linezolid 600 mg IV/PO q12h Adapted from IDSA Guidelines for MRSA Staphylococcus epidermidis Preferred Regimen ▸ Nafcillin 1.5-2 g IV q4h OR ▸ Oxacillin 1.5-2 g IV q4h OR ▸ Cefazolin 1 g IV q8h Alternative Regimen Methicillin-resistant ▸ Vancomycin 15-20 mg/kg IV q8h|} Streptococcus groups A, B, C, G Preferred Regimen ▸ Penicillin G 20 MU IV q24h or divided in 6 doses/day OR ▸ Ceftriaxone 2 g IV or IM q24h OR ▸ Cefazolin 1 g IV q8h Alternative Regimen ▸ Vancomycin 15mg/kg IV q12h E. coli Preferred Regimen ▸Ampicillin-sulbactam 3g q6h Alternative Regimen ▸ Cefazolin OR ▸ levofloxacin OR ▸ Gentamicin OR ▸ Trimethoprim/sulfamethoxazole Pseudomonas aeruginosa Preferred Regimen ▸ Ciprofloxacin 750 mg PO q12h Alternative Regimen ▸ Levofloxacin 500 mg PO q24h PLUS ▸ Gentamicin 1.7 mg/kg IV q8h Neisseria gonorrhoeae Preferred Regimen ▸ Ceftriaxone 1 g IV q24h for 1-2 days after clinical improvement FOLLOWED BY ▸ Cefixime 400 mg po q12h for 1 week OR ▸ Ciprofloxacin 500 mg po q12h for 1 week OR ▸ Ofloxacin 400 mg PO q12h for 1 week Alternative Regimen ▸ Ciprofloxacin 400 mg IV q12h for 1-2 days after clinical improvement OR ▸ Ofloxacin 400 mg iv q12h for 1-2 days after clinical improvement OR ▸ Spectinomycin 2 g IM q12h for 1-2 days after clinical improvement FOLLOWED BY ▸ Ciprofloxacin 500 mg po q12h for 1 week OR ▸ Ofloxacin 400 mg po q12h for 1 week Haemophilus influenzae Preferred Regimen ▸ Amoxicillin-clavulanate 875/125 mg PO q12h OR ▸ Cefprozil 500 mg PO q12h OR ▸ Cefuroxime 500 mg PO q12h OR ▸ Cefdinir 600 mg PO q24h Alternative Regimen ▸ Levofloxacin 750 mg IV/PO qd OR ▸ Moxifloxacin 400 mg IV/PO qd OR ▸ Clarithromycin 500 mg PO q12h Mycobacterium tuberculosis Intensive Phase ▸ Isoniazid 5mg/kg PO qd for 2 months OR ▸ Isoniazid 10 mg/kg PO 3 times per week × 2 months PLUS ▸ Rifampicin 10 mg/kg PO qd for 2 months OR ▸ Rifampicin 10 mg/kg PO 3 times per week × 2 months PLUS ▸ Pyrazinamide 25mg/kg PO qd for 2 months OR ▸ Pyrazinamide 35 mg/kg PO 3 times per week × 2 months PLUS ▸ Ethambutol 15mg/kg PO qd for 2 months Continuation Phase ▸ Isoniazid 5mg/kg PO for 4-7 months OR ▸ Isoniazid 10 mg/kg PO 3 times per week × 4-7 months PLUS ▸ Rifampicin 10 mg/kg PO qd for 4-7 months OR ▸ Rifampicin 10 mg/kg PO 3 times per week for 4-7 months Adapted from Treatment of Tuberculosis: Guidelines. Borrelia burgdorferi Preferred Regimen ▸ Amoxicillin 500 mg q8h for 28 days OR ▸ Doxycycline 100 mg q12h for 28 days OR ▸ Cefuroxime 500 mg q12h for 28 days Alternative Regimen ▸ Azithromycin 500 mg PO qd for 7–10 days OR ▸ Clarithromycin 500 mg PO q12h for 14–21 days OR ▸ Erythromycin 500 mg PO q6h for 14–21 days Adapted from IDSA Guidelines: The Clinical Assessment, Treatment, and Prevention of Lyme Disease, Human Granulocytic Anaplasmosis, and Babesiosis: Treponema pallidum Preferred Regimen ▸ Penicilin G 2.4 MU IM single dose Alternative Regimen ▸ Doxycycline 100 mg PO q12h x 14 days OR ▸ Tetracycline 500 mg PO q6h x 14 days OR ▸ Ceftriaxone 1 g IM/IV q24h x 10 -14 days Adapted from Adapted from MMWR Recomm Rep. 2006;55(RR-11):1-94 T. whipplei Preferred Regimen ▸ Penicillin G 2 MU IV q4h PLUS ▸ Streptomycin 1 g IM/IV q24h FOLLOWED BY ▸ Trimethoprim/Sulfamethoxazole 160mg/800mg PO qd for 1 year Alternative Regimen ▸ Ceftriaxone 2 g IV q24h FOLLOWED BY ▸ Trimethoprim/Sulfamethoxazole 160mg/800mg PO qd for 1 year

Pathogen-Based Therapy — Fungi

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Fungi   ▸  Candida   ▸  Coccidioides   ▸  Blastomyces   ▸  Histoplasma   ▸  Sporothrix   ▸  Aspergillus

Candida Preferred Regimen ▸ Amphotericin B deoxycholate 0.5-1 mg/kg/day for 2-3 weeks FOLLOWED BY ▸ Fluconazole to complete a total duration of therapy of 6-12 months. Preferred Regimen ▸ Itraconazole 400 mg/day for at least 12 months Aspergillus Preferred Regimen ▸ Voriconazole

Pathogen-Based Therapy in Patients with Prosthetic Joint — Bacteria Adapted from Diagnosis and Management of Prosthetic Joint Infection CID 2013:56

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Bacteria   ▸  Staphylococci, oxacillin-susceptible   ▸  Staphylococci, oxacillin-resistant   ▸  Enterococcus spp, penicillin-susceptible   ▸  Enterococcus spp, penicillin-resistant   ▸  Pseudomonas aeruginosa   ▸  Enterobacter spp   ▸  Enterobacteriaceae

Staphylococci, oxacillin-susceptible Preferred Regimen ▸ Nafcillin 1.5-2 g IV q4-6h OR ▸ Cefazolin 1–2 g IV q8 h OR ▸ Ceftriaxone 1–2 g IV q24h Alternative Regimen ▸ Vancomycin IV 15 mg/kg q12h OR ▸ Daptomycin 6 mg/kg IV q24h OR ▸ Linezolid 600 mg PO/IV q12h Staphylococci, oxacillin-resistant Preferred Regimen ▸ Vancomycin 15 mg/kg IV q12h Alternative Regimen ▸ Daptomycin 6 mg/kg IV q24h OR ▸ Linezolid 600 mg PO/IV q12h Enterococcus spp, penicillin-susceptible Preferred Regimen ▸ Penicillin G 20-40 MU IV q24h continuously or divided in 6 doses Alternative Regimen ▸ Vancomycin IV 15 mg/kg q12h OR ▸ Daptomycin 6 mg/kg IV q24h OR ▸ Linezolid 600 mg PO/IV q12h Enterococcus spp, penicillin-resistant Preferred Regimen ▸ Vancomycin IV 15 mg/kg q12h Alternative Regimen ▸ Daptomycin 6 mg/kg IV q24h OR ▸ Linezolid 600 mg PO/IV q12h Pseudomonas aeruginosa Preferred Regimen ▸ Cefepime 2 g IV q12 h OR ▸ Meropenem 1 g IV q8 h Alternative Regimen ▸ Ciprofloxacin 750 mg PO q12h or 400 mg IV q12h OR ▸ Ceftazidime 2 g IV q8h Enterobacter spp Preferred Regimen ▸ Cefepime 2 g IV q12h OR ▸ Ertapenem 1 g IV q24 h Alternative Regimen ▸ Ciprofloxacin 750 mg PO q12h or 400 mg IV q12h