Patients admitted to the hospital with acute infections are often treated with intravenous (IV) antibiotics. Around 70% of these infections fall into three categories: respiratory tract infections, urinary tract infections, and cellulitis. A Danish study found that 76% of patients admitted with suspected community-acquired pneumonia and treated with antibiotics received them intravenously. Based on an extrapolated estimate from an unpublished local survey, approximately 50,000 patients in Denmark are admitted each year for infections and treated with IV antibiotics. The average hospital stay for these patients is 5.9 days, resulting in a total of 295,000 hospital days annually, accounting for about 7% of total hospital admissions in Denmark. This represents an annual cost of 2.3 billion DKK. While some patients need hospitalization due to their overall health or other serious conditions, others remain hospitalized primarily to receive IV antibiotics. Expanding the use of oral antibiotics in emergency departments should be pursued only if it can demonstrate comparable efficacy and safety to IV administration. Therefore this study will investigate the efficiency of primarily oral antibiotics in acutely admitted patients with proven or suspected infections. Additionally, the investigators will evaluate the safety of oral regimen for these patients.