The calculator in question is the Diagnostic Criteria for Acute Bronchitis. This clinical scoring system is used to diagnose acute bronchitis, a common condition characterized by inflammation of the bronchial tubes. It is primarily applicable to patients presenting with symptoms of a lower respiratory tract infection, such as cough, sputum production, chest discomfort, and shortness of breath.

The clinical utility of this calculator is to help clinicians differentiate acute bronchitis from other respiratory conditions like pneumonia or chronic obstructive pulmonary disease (COPD). It can guide appropriate treatment decisions, such as the need for antibiotics or other interventions.

Exclusion criteria for the use of this calculator may include patients with known lung diseases like COPD or asthma, as these conditions can mimic the symptoms of acute bronchitis. Additionally, it may not be suitable for patients with severe symptoms or signs of a more serious condition, such as high fever or rapid breathing, which may indicate pneumonia or other serious respiratory diseases.

Diagnostic criteria for acute bronchitis

# Criteria
 A. Symptoms of an acute respiratory infection (predominantly cough, with or without sputum production)
B. Symptoms lasting < 3 weeks
C. Pneumonia ruled out clinically and radiographically as the cause of cough
D. Common cold, acute asthma or an exacerbation of COPD ruled out as the cause of cough

# Conditions
- A and B and C and D
- true