The Shorr score for MRSA pneumonia evaluates various patient factors to estimate the risk of a Methicillin-resistant Staphylococcus aureus (MRSA) infection. By assigning specific scores to each input based on predefined criteria, the tool calculates a total score that correlates with a particular level of MRSA risk.

Inputs include age, recent healthcare exposures, ICU admission status, and pre-existing conditions. Here's how they contribute to the score:

| Factor                                                                                       | Response Options          | Score |
|----------------------------------------------------------------------------------------------|---------------------------|-------|
| Age, years                                                                                   | 19-29                     | 1     |
|                                                                                              | 30-79                     | 0     |
|                                                                                              | >= 80                     | 1     |
| Nursing home, skilled nursing facility or long-term acute care exposure within the last 90 days | Yes                       | 1     |
|                                                                                              | No                        | 0     |
| Prior IV antibiotic therapy within the last 30 days                                          | Yes                       | 1     |
|                                                                                              | No                        | 0     |
| Recent hospitalization for ≥ 2 days within the last 90 days                                  | Yes                       | 2     |
|                                                                                              | No                        | 0     |
| ICU admission on or before index culture                                                     | Yes                       | 2     |
|                                                                                              | No                        | 0     |
| Any cerebrovascular disease prior to admission                                               | Yes                       | 1     |
|                                                                                              | No                        | 0     |
| Dementia                                                                                     | Yes                       | 1     |
|                                                                                              | No                        | 0     |
| Female with diabetes mellitus                                                                | Yes                       | 1     |
|                                                                                              | No                        | 0     |

The calculator computes the score by summing the individual scores for each factor based on a patient’s responses. The resulting total score helps interpret the risk of MRSA pneumonia as follows:

- A score of 1 or less indicates a low risk of MRSA.
- A score between 2 and 5 indicates an intermediate risk.
- A score of 6 or more signifies a high risk.

The Shorr Score for Methicillin-Resistant Staphylococcus Aureus (MRSA) Pneumonia is a clinical calculator used to predict the likelihood of MRSA as the causative pathogen in patients with hospital-acquired pneumonia. This scoring system is particularly useful in guiding empiric antibiotic therapy in patients with hospital-acquired pneumonia, especially in settings where MRSA is prevalent. The Shorr Score includes factors such as recent hospitalization, prior antibiotic use, and presence of severe sepsis or septic shock. It does not have specific exclusion criteria, but it may be less accurate in patients with community-acquired pneumonia or in those with less common causes of pneumonia.