in guideline Infection Viral Infection Virus Disease Any disease caused by a virus. http://bioportal.bioontology.org/ontologies/NCIT/?p=classes&conceptid=http%3A%2F%2Fncicb.nci.nih.gov%2Fxml%2Fowl%2FEVS%2FThesaurus.owl%23C3439 Perhaps use as Disease Modifier? Add these sub-classes: Hepatitis C Infection (term in NCIT) Hepatitis B Infection (term in NCIT) HIV Infection (term in NCIT) SCDO:0001233 Sufficient NCIT:C3439 Viral Disease National Guideline for the Control and Management of Sickle Cell Disease Management of Sickle Cell Disease - The United Republic of Tanzania A Parental Guide to Managing Sickle Cell Disease Standards for Clinical Care of Adults with Sickle Cell Disease in the UK Sickle Cell Disease: The Clinical Care Guidelines of the Sickle Cell Unit Consensus Statement on the Care of Patients with Sickle Cell Disease in Canada Evidence-Based Management of Sickle Cell Disease ENERCA Clinical Recommendations for Disease Management and Prevention of Complications of Sickle Cell Disease in Children