Establish MeMed BV™ Performance for Differentiating Bacterial From Viral Infection in Suspected Acute Infection Patients (APOLLO STUDY)

Inclusion Criteria: * Written informed consent must be obtained from the patient or his/her legal guardian. For children under 18 years old, written informed consent from the legal guardian and assent from the patient (depending on the local requirements) * Over 90 days of age * Clinical suspicion of acute bacterial or viral infection * Temperature ≥ 37.8°C (100°F) (any body site, any measurement device, including self-reported) or tactile fever, either of them noted at least once within the last 7 days * Current disease duration ≤ 7 days Exclusion Criteria: * Another unrelated episode of febrile infection within the past 2 weeks * Suspicion and/or confirmed diagnosis of infectious gastroenteritis/ colitis * \>48 hours of oral antibiotic treatment * \>12 hours of intravenous\\intramuscular antibiotic treatment * HIV, HBV, or HCV infection (self-declared or known from medical records) * A proven or suspected infection on presentation with Mycobacterial (e.g. Tuberculosis, MAC), parasitic or fungal (e.g. Candida, Histoplasma, Aspergillus) pathogen * Active inflammatory disease (e.g. IBD, SLE, JIA, RA, Kawasaki, other vasculitis) * Major trauma and\\or burns in the last 7 days * Major surgery in the last 7 days * Congenital immune deficiency (CID) * Acquired immune deficiency\\modulation state including: * Active malignancy * Current treatment with immune-suppressive or immune-modulating therapies, including without limitations: * Administration of P.O.\\IV\\IM high dose steroids \>1mg/kg/day prednisone (or equivalent) at some point in the past 10 days or daily continuous use of steroids \> 0.25 mg/kg/day in the past 7 days * Monoclonal antibodies, anti-TNF agents * Intravenous immunoglobulin (IVIG) * Cyclosporine, Cyclophosphamide, Tacrolimus, Azathioprine, Methotrexate * G/GM-CSF, Interferons * Post solid organ/bone marrow transplant patients * Asplenia, sickle cell disease * Indwelling central venous catheter * Cystic Fibrosis * Pregnancy- self reported or medically known * Other severe illnesses that affect life expectancy and quality of life such as: * Severe psychomotor retardation * Congenital metabolic disorder * End stage renal disease, advanced heart failure (NYHA 3/4), advanced COPD (GOLD 3/4)