You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["HealthCareActivity", "InjuryOrPoisoning", "BodySubstance", "IntellectualProduct", "AnatomicalStructure", "SpatialConcept", "Chemical", "Bacterium", "MedicalDevice", "Organization", "BiomedicalOccupationOrDiscipline", "Finding", "BiologicFunction", "Virus", "ResearchActivity", "ClinicalAttribute", "PopulationGroup", "Eukaryote", "BodySystem", "Food", "ProfessionalOrOccupationalGroup"].

Please return the output as a JSON object of the format: {"Virus": ["HIV", ...], "Bacterium": ["MRSA", ...], "AnatomicalStructure": ["Lung", ...], "BodySystem": ["CNS", ...], "BodySubstance": ["Serum", ...], "Finding": ["Headache", ...], "InjuryOrPoisoning": ["Fracture", ...], "BiologicFunction": ["Death", ...], "HealthCareActivity": ["Biopsy", ...], "ResearchActivity": ["Clinical trial", ...], "MedicalDevice": ["Lenses", ...], "SpatialConcept": ["Camps", ...], "BiomedicalOccupationOrDiscipline": ["Forensic medicine", ...], "Organization": ["WHO", ...], "ProfessionalOrOccupationalGroup": ["Provider", ...], "PopulationGroup": ["Swimmers", ...], "Chemical": ["Gold", ...], "Food": ["Rice", ...], "IntellectualProduct": ["RPAM", ...], "ClinicalAttribute": ["Biomarker", ...], "Eukaryote": ["Dogs", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Epidemiology of polyomavirus BK (BKV) and the emergent African variant in kidney and bone marrow transplant recipients in the Fundacion Valle del Lili in Cali, Colombia To describe the epidemiology of BKV and to assess the presence of the African variant in bone marrow and kidney transplant patients who have suspected BKV reactivation. A descriptive study was conducted, using institutional records, at the Fundación Valle del Lili, Cali - Colombia. The overall prevalence of BKV during the study period was 51%. The African variant was identified in 49.4% of samples that were positive for BKV. 50.6% of the samples were found to have the wild strain of BKV. Among BKV positive patients, 57% were kidney transplant recipients and 43% were bone marrow transplant recipients. This is the first epidemiological study describing the African variant of BKV in Colombia.
{"AnatomicalStructure": ["bone marrow", "wild", "kidney"], "Bacterium": [], "BiologicFunction": [], "BiomedicalOccupationOrDiscipline": ["Epidemiology", "epidemiology"], "BodySubstance": [], "BodySystem": [], "Chemical": [], "ClinicalAttribute": [], "Eukaryote": [], "Finding": ["presence", "kidney transplant patients", "kidney transplant recipients", "positive"], "Food": [], "HealthCareActivity": [], "InjuryOrPoisoning": [], "IntellectualProduct": ["institutional records"], "MedicalDevice": [], "Organization": ["Fundacion Valle del Lili in Cali", "Fundaci\u00f3n Valle del Lili, Cali"], "PopulationGroup": [], "ProfessionalOrOccupationalGroup": [], "ResearchActivity": ["descriptive study", "epidemiological study"], "SpatialConcept": ["African", "Colombia"], "Virus": ["polyomavirus BK", "BKV"]}