Hepatitis C lookback exercise.
D000208:Acute Disease; D002353:Carrier State; D004739:England / Q000453:epidemiology; D005838:Genotype; D016174:Hepacivirus / Q000235:genetics; D006526:Hepatitis C / Q000453:epidemiology* / Q000235:genetics / Q000635:transmission; D017757:Infectious Disease Transmission, Professional-to-Patient