RSV
Note: Symptoms vary and differ with age. Infants under age 1 are most severely affected and often have the most trouble breathing. Older children usually have only mild, cold-like symptoms. Symptoms usually appear 4-6 days after exposure.
Rapid tests for this virus can be performed at many hospitals on fluid obtained from the nose.
Meissner HC, Long SS; American Academy of Pediatrics Committee on Infectious Diseases and Committee on Fetus and Newborn. Revised indications for the use of palivizumab and respiratory syncytial virus immune globulin intravenous for the prevention of respiratory syncytial virus infections. Pediatrics. 2003 Dec;112(6 Pt 1):1447-52.
Cincinnati Children's Hospital Medical Center. Evidence based clinical practice guideline for medical management of bronchiolitis in infants less than 1 year of age presenting with a first time episode. Cincinnati (OH): Cincinnati Children's Hospital Medical Center; 2006 May. 13 p.