title: Identification of a type B hepatitis epidemic in Costa Rica. Comparative analysis of two outbreaks of viral hepatitis.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D003364:Costa Rica; D003937:Diagnosis, Differential; D004196:Disease Outbreaks; D004197:Disease Reservoirs; D006506:Hepatitis A / Q000175:diagnosis / Q000453:epidemiology; D006509:Hepatitis B / Q000175:diagnosis* / Q000453:epidemiology / Q000235:genetics; D006511:Hepatitis B Antigens / Q000302:isolation & purification; D006801:Humans; D007223:Infant; D008875:Middle Aged; D012111:Residence Characteristics; D012621:Seasons; D012698:Serologic Tests
chemical_list: D006511:Hepatitis B Antigens