It should be noted this guideline addresses the treatment only for patients in the Untied States without recent travel who are immunocompetent adults.
Diagnosis:
Gram stain and culture of respiratory secretions AND blood cultures for:
Hospitalized patients with severe CAP table 1, empiric treatment for MRSA/P. aeruginosa , prior infection with of MRSA/P. aeruginosa, or IV antibiotics in last 90 days (overall very low quality evidence).
Legionella urinary antigen
In the case of an outbreak , recent travel, or severe CAP (conditional recommendation, low quality evidence)
Influenza nucleic acid amplification
When influenza is circulating in the community (Strong recommendation, mod quality evidence)
Treatment:
Outpatient vs Inpatient
Clinical prediction tools, PSI(Pneumonia Severity Index) preferred over the CURB-65, should be used with clinical judgement to help determine inpatient vs outpatient treatment (conditional recommendation, low quality evidence).
Outpatient antibiotic selection is detailed in table 3.
Coverage is expanded if a patient is consider high risk. High risk patients are those with comorbidities including: chronic heart, ling, liver, or renal disease, diabetes, alcoholism, malignancy or asplenia.
Inpatient antibiotic selection is detailed in table 4.
Coverage is dependent on severity table 1 of illness and is expanded for patients with prior respiratory isolation of MRSA, p. aeruginosa.
Influenza treatment with oseltamivir should be started in patients with confirmed CAP and influenza positive regardless of timing of diagnosis. They should also be treated with antibiotics.
Duration of treatment should be continued until the reach clinical stability and no less than 5 days. Clinical stability should be defined by a validated measure including resolution of vital sign abnormalities, ability to eat, and normal mentation. MRSA and P. aeruginosa treatment should be 7 days.
The IDSA makes recommendations against:
- the use of procalcitonin to distinguish a viral from a bacterial etiology in patients with clinical symptoms and chest radiography consistent with pneumonia.
- anaerobic coverage in suspected aspiration pneumonia without lung abscess or empyema.
- the use of corticosteroids routinely with the exception of patients with CAP and refractory septic shock.
- routine follow-up chest imaging
Reference: Diagnosis and Treatment of Adults with Community-acquired Pneumonia. An Official Clinical Practice Guideline of the American Thoracic Society and Infectious Diseases Society of America 2019