Sepsis, Source Unknown and other Nonfocal infections

Severe Sepsis - Children with Healthcare Exposure or Comorbidities

Patient Population:
Pediatric

These guidelines are intended for patients who meet criteria for severe sepsis: 

Probable or documented infection AND 

Systemic inflammatory response criteria AND 

Specific evidence of hypo-perfusion or organ dysfunction not explained by an alternative process: 

Cardiovascular dysfunction, OR 

Acute respiratory distress syndrome, OR 

Dysfunction in two or more other organ systems  

Refer to consensus definitions for additional detail   

These guidelines are not intended for "rule out" scenarios in clinically stable patients; patients presenting with signs and/or symptoms of infection but not meeting criteria for severe sepsis should either be monitored without antibiotic therapy in appropriate circumstances or receive empiric antibiotics selected based on the suspected source and risk factors.  

Condition Major Pathogens  First Choice Therapy Alternative Therapy Comments

Severe sepsis, > 28 days old, with preexisting medical comorbidities or healthcare exposure: 

Central line 

Solid organ transplant (except liver, see specific guidelines below) 

Immunodeficiency 

Immunosuppressive medications 

Follow separate guidelines below that have been developed for specific populations

Fever in Oncology/BMT patients (BCH SF) 

Sepsis guidelines for ICN patients (BCH SF) 

Guidelines for patients with acute liver failure, end stage liver disease, biliary atresia, or < 2 months s/p liver transplantation (BCH SF) 

Staphylococcus aureus 

Gram-negative bacteria including Pseudomonas, Enterobacter, other MDR organisms 

Enterococcus spp 

Candida spp in certain risk groups 

May also have community-acquired pathogens 

  

Cefepime
50 mg/kg/dose (max 2000 mg/dose) IV q8h  

AND  

Vancomycin  

(follow link for dosing & monitoring)   
 
Consult a clinical pharmacist for patient-specific Vancomycin recommendations if there is evolving kidney injury 

ADD 

Metronidazole 10 mg/kg/dose (max 500 mg/dose) IV q8h for suspected intra-abdominal infection 

For patients on TPN, high-dose steroids, or already on broad spectrum antibiotics, consider echinocandin antifungal, specific agent per hospital formulary:  

BCH OAK: 

Micafungin 3 mg/kg/dose (max 150 mg/dose) IV q24h 

BCH SF: 

Caspofungin*
70 mg/m2 first dose (max 70 mg/dose), then 50 mg/m2/dose (max 50 mg/dose) IV q24h (Caspofungin dosing differs in children 1-3 months old - refer to Pediatric Antimicrobial Dosing Guideline

If patient develops sepsis while on broad spectrum antibiotics

Replace Cefepime with Meropenem
20 mg/kg/dose (max 1000 mg/dose) IV q8h  

---------------------

Penicillin or cephalosporin allergy with higher risk for allergic reaction

Use Aztreonam 30 mg/kg/dose (max 2000 mg/dose) IV q8h  

AND  

Ciprofloxacin
15 mg/kg/dose (max 400 mg/dose IV q8h) IV q12h  

in place of Cefepime 

(with Vancomycin) 

ID consult recommended 

Review patient’s past microbiology history and ensure coverage of any recent (within the past 3 months) multidrug resistant organisms  

*ID/ASP approval required for Micafungin or Caspofungin 

Antibiotic therapy should be re-evaluated at <= 48 hours and narrowed to target the identified source/pathogen.  If a specific source or pathogen is not identified it is still recommended to de-escalate  therapy in most circumstances.  

If Vancomycin was initiated, it should be discontinued at this time unless a resistant gram-positive pathogen is identified OR there is a clinically documented source of infection with higher likelihood of resistant gram-positive etiology.  

Expanded gram-negative therapy (e.g. second gram negative agent or carbapenem) should be narrowed in most cases if cultures do not reveal a resistant gram-negative organism 

If Micafungin or Caspofungin was initiated, it should be discontinued if yeast/Candida is not isolated from blood culture or other normally sterile site within 48-72 hours  

Severe Sepsis - Previously Healthy Infant or Child

Patient Population:
Pediatric

These guidelines are intended for patients who meet criteria for severe sepsis:

         Probable or documented infection AND 

Systemic inflammatory response criteria AND 

Specific evidence of hypo-perfusion or organ dysfunction not explained by an alternative process: 

Cardiovascular dysfunction, OR 

Acute respiratory distress syndrome, OR 

Dysfunction in two or more other organ systems

Refer to consensus definitions for additional detail   

These guidelines are not intended for "rule out" scenarios in clinically stable patients; patients presenting with signs and/or symptoms of infection but not meeting criteria for severe sepsis should either be monitored without antibiotic therapy in appropriate circumstances or receive empiric antibiotics selected based on the suspected source and risk factors.  

Condition Major Pathogens  First Choice Therapy Alternative Therapy Comments

Severe sepsis, 0-28 days old, community-onset, previously healthy (admitted from home)   

See BCH SF Guidelines for Sepsis in the ICN for empiric therapy in neonates who develop severe sepsis while hospitalized  

Enteric gram-negative bacteria  

Group B streptococcus 

Less Common: 

Staphylococcus aureus 

Listeria monocytogenes 

Herpes simplex virus 

Ceftazidime 

AND 

Ampicillin 

REPLACE Ampicillin with Vancomycin if suspected skin, soft tissue, bone or joint source 

ADD Acyclovir pending HSV evaluation if not already completed 

For continuation of therapy if indicated after initial stabilization in appropriate circumstances, Ceftriaxone may be used in place of Ceftazidime if neonate meets specific safe use criteria 

ID consult recommended 

Evaluation for meningitis via LP is recommended as soon as able 

Refer to Neonatal Dosing Guideline for antibiotic doses and intervals

Refer to Fever Without a Source section if patient does not meet criteria for severe sepsis 

Antibiotic therapy should be re-evaluated at <= 48 hours and narrowed to target the identified source/pathogen. If a specific source or pathogen is not identified it is still recommended to narrow therapy in most circumstances.  

If Vancomycin was initiated, it should be discontinued at this time unless a resistant gram-positive pathogen is identified OR there is a clinically documented source of infection with higher likelihood of resistant gram-positive etiology. 

Severe sepsis, > 28 days old, community-onset, no preexisting comorbidities or recent healthcare exposure 

Staphylococcus aureus 

Streptococcus pneumoniae 

Group A streptococcus 

Neisseria meningitidis 

Enteric gram-negative bacteria 

Ceftriaxone
50 mg/kg/dose (max 2000 mg/dose) IV q24h  

(dosing for non-CNS infection; refer to Meningitis section if meningitis is suspected)  

AND 

Vancomycin  

(follow link for dosing & monitoring)   

Consult a clinical pharmacist for patient-specific Vancomycin recommendations if there is evolving kidney injury 

ADD Metronidazole
10 mg/kg/dose (max 500 mg/dose) IV q8h for suspected intra-abdominal infection 

Penicillin or cephalosporin allergy with higher risk for allergic reaction

Aztreonam
30 mg/kg/dose (max 2000 mg/dose) IV q8h in place of Ceftriaxone (use with Vancomycin) 

  

ID consult recommended 

Antibiotic therapy should be re-evaluated at <= 48 hours and narrowed to target the identified source/pathogen 

If Vancomycin was initiated, it should be discontinued at this time unless a resistant gram-positive pathogen is identified OR there is a clinically documented source of infection with higher likelihood of resistant gram-positive etiology.   

Fever Without a Source - Young Infant

Patient Population:
Pediatric

Definition of Fever Without a Source: Temperature >=38.0 C/100.4 F in an infant from one of the age groups below. 

Age-appropriate culture evaluation per local algorithm should be completed before antibiotic administration. 

Modification of therapy is indicated if a focal source is identified or suspected: 

  • Refer to Severe Sepsis section for infants who meet criteria for severe sepsis.  
  • Refer to Meningitis section if meningitis is suspected based on specific clinical signs (e.g. seizure, neurologic changes) or symptoms or CSF pleocytosis. 
  • Refer to Herpes Simplex Virus section if neonatal HSV is suspected.  
  • Consult ID for suspected bone or joint infection.  
  • Conventional antibiotics used for fever without a source do not provide sufficient activity for common skin flora - additional gram-positive coverage is needed if signs of skin/soft tissue infection are present.  
Condition Major Pathogens  First Choice Therapy Alternative Therapy Comments

Fever without a source

0-28 days, community-onset, previously healthy (admitted from home), without symptoms or signs indicating high suspicion for meningitis (applies to most infants undergoing evaluation) 

Enteric gram- negative bacteria 

Group B streptococcus 

  

Ampicillin * 

AND 

Gentamicin* 

Acyclovir should not be routinely added based on fever alone - refer to Herpes Simplex Virus section for indications 

Eligible per local evaluation algorithm (BCH OAK refer to REVISE algorithm - link requires password log in to Box) or other clinical pathway:  

For patients age 22-28 days treated via defined evaluation pathway enabling discharge without hospitalization per AAP guidelines, may follow pathway-recommended first choice therapy.

Refer to Neonatal Dosing Guideline for antibiotic doses and intervals 

Therapy should not be broadened based on ongoing fever alone. Many infections in this age group are viral. Consider evaluation and testing for viral infection based on clinical presentation. 

Fever without a source 

29-60 days old, community-onset, previously healthy (presenting from home), without symptoms or signs indicating high suspicion for meningitis (applies to most infants undergoing evaluation) 

Streptococcus pneumoniae 

Enteric gram-negative bacteria 

Group B streptococcus 

  

Eligible for observation without antibiotics per local evaluation algorithm (BCH OAK refer to REVISE algorithm - link requires password log in to Box):  

Antibiotic treatment is not indicated 

------------------------ 

Empiric antibiotic recommended per local evaluation algorithm

Ceftriaxone 50 mg/kg/dose IV q24h 

Acyclovir should not be routinely added based on fever alone - refer to Herpes Simplex Virus section for indications 

 

Therapy should not be broadened based on ongoing fever alone. Many infections in this age group are viral. Consider evaluation and testing for viral infection based on clinical presentation 

Refer to Urinary Tract Infection section if initial evaluation indicates UTI is likely (pyuria on urinalysis). Initial oral therapy may be appropriate based on evaluating provider discretion 

References:  

Greenhow TG, Cantey JB. The disputed champion: ampicillin and gentamicin for febrile young infants. Hosp Pediatr 2017;7:499-501. 

Bruno E, et al. During the emergency department evaluation of a well-appearing neonate with fever, should empiric acyclovir be initiated? Clinical Practice Guideline, American Academy of Emergency Medicine, 2017.  

Leazer R, et al. A meta-analysis of the rates of Listeria monocytogenes and Enterococcus in febrile infants. Hosp Pediatr 2016;6:187-195. 

American Academy of Pediatrics. In: Kimberlin DW, Barnett ED, Lynfield R, Sawyer MH, eds. Red Book: 2021 Report of the Committee on Infectious Diseases. 32nd ed. Elk Grove Village, IL: American Academy of Pediatrics; 2021.  

 

Outpatient treatment of low-risk neutropenic fever

Patient Population:
Adult
Diagnosis Common Pathogens Drug(s) of First Choice Alternative Drug(s) Comments Expected Duration
Outpatient treatment of low-risk neutropenic fever

Streptococci spp.

Enteric gram-negative bacteria

Pseudomonas aeruginosa

Enterococci

Staphylococci

Viral infections

Fungal infections

Ciprofloxacin

PLUS

Amoxicillin/clavulanic acid
Levofloxacin

Need to take into account how sick the patient is at presentation, underlying comorbidities, localizing signs/symptoms, and age. Risk calculators are available

Patients already on levofloxacin prophylaxis should be treated with IV therapy

Expected duration of neutropenia should be < 7 days

Ensure patient has easy access to medical care and is able to tolerate oral therapy

Excludes patients on prior oral antibacterial prophylaxis

Consider supervised observation in clinic; schedule close outpatient follow-up

Until afebrile at least 72 hours

If source identified, tailor for source of infection

Healthcare-acquired sepsis with unknown source

Patient Population:
Adult
Diagnosis Common Pathogens Drug(s) of First Choice Alternative Drug(s) Comments Expected Duration

Healthcare-acquired sepsis with unknown source

Enterobacteriaceae

S. aureus

Streptococci spp.

P. aeruginosa

Vancomycin

PLUS one OF:

Piperacillin/

tazobactam

OR

Cefepime

OR

Meropenem*

ALL WITH OR WITHOUT

Tobramycin

For severe beta-lactam allergy:

Vancomycin

PLUS

Metronidazole

PLUS

Aztreonam

WITH OR WITHOUT

Tobramycin

Weigh risks and benefits of adding aminoglycoside for critical illness, immunocompromise, or history of infection or colonization with drug-resistant Gram-negative rods

Refer to the UCSF Code Sepsis Guidelines

*For patients with neutropenia, organ transplant, severe hepatic failure, or current/recent (<7 days) piperacillin/tazobactam or cefepime

Stop antibiotics at 48 hours if work-up does not reveal a source of infection

Duration should otherwise be tailored to clinical or microbiological source

LTU Guidelines

F+N Guidelines

Community Acquired Sepsis with Unknown Source

Patient Population:
Adult
Diagnosis Common Pathogens Drug(s) of First Choice Alternative Drug(s) Comments Expected Duration
Community Acquired Sepsis with Unknown Source

Enterobacteriaceae

S. aureus

Streptococci spp.

Vancomycin

PLUS one of:

Ceftriaxone

OR

Piperacillin/tazobactam

OR

Ertapenem (if known prior ESBL isolation)

For severe beta-lactam allergy:

Vancomycin

PLUS

Metronidazole

PLUS

Aztreonam

Follow empiric therapy based upon source or clinical syndrome, if known (e.g. pneumonia, UTI, etc.)

Stop antibiotics at 48 hours if work-up does not reveal a source of infection

Duration should otherwise be tailored to clinical or microbiological source

Fever in a person who injects drugs

Patient Population:
Adult
Diagnosis Common Pathogens Drug(s) of First Choice Alternative Drug(s) Comments Expected Duration

Fever in a person who injects drugs

*for patients with severe sepsis, refer to guidelines for sepsis

S. aureus

Streptococci spp.

Enterococcus spp.

Occasional gram negative rods

Vancomycin

 

Infectious Diseases Consultation recommended for all cases of suspected endocarditis

Ceftriaxone (alternative: ciprofloxacin) could be added to patients with more severe disease