The purpose of this study is to determine if the use of antibiotic guidelines and thus antibiotics can be improved through a description of possible barriers leading to tailored interventions.

Inclusion Criteria:

• Diagnosed community-acquired pneumonia (CAP)
• Diagnosed community-acquired pyelonephritis

Exclusion Criteria:

• CAP: hospital-acquired pneumonia; patients transferred from other hospital; death within 24h, aspiration pneumonia, immunocompromised status, palliative status, admission due to social reasons
• Pyelonephritis: urinary tract with functional or physical abnormalities, urinary catheterisation, pregnancy, (immunocompromised status, palliative status, admission due to social reasons and history of renal transplant.

Patients admitted to the hospital with a diagnosis of community-acquired pneumonia or community-acquired pyelonephritis