Shorr Score (MRSA Pneumonia Risk)
Shorr MRSA-pneumonia risk score — a weighted count predicting MRSA in culture-positive pneumonia (a total marking > 30% MRSA prevalence is high risk).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Recent hospitalization
- Yes
- ICU admission at presentation
- Yes
- Dementia
- Yes
- Cerebrovascular disease
- Yes
Result: Shorr 6 — high (MRSA > 30% per source) MRSA risk.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0-1
- Low — MRSA < 10% per source; anti-MRSA therapy may be safely withheld.
- 2-5
- Medium MRSA risk.
- >= 6
- High — MRSA > 30% per source. It reports MRSA risk, not a vancomycin/linezolid order.
What you enter
- Recent hospitalization (+2)
- ICU admission at presentation (+2)
- Age < 30 or > 79 (+1)
- Prior IV antibiotic exposure (+1)
- Dementia (+1)
- Cerebrovascular disease (+1)
- Female sex with diabetes (+1)
- Nursing-home / LTAC / SNF exposure (+1)
How this is calculated
Shorr AF, Myers DE, Huang DB, Nathanson BH, Emons MF, Kollef MH. A risk score for identifying methicillin-resistant Staphylococcus aureus in patients presenting to the hospital with pneumonia. BMC Infect Dis. 2013;13:268. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.