Human beings (8) infection (7) Infection (7) Patients (6) Patients (6) test (5) screening (5) Control (5) Examinations (5) Blood donors (5) Blood (5) Infections (5) safety (4) disease (4) detection (4) Methods (4) Hepatitis (4) Methods (4) Detection (4) disease (4) well (3) virus (3) surveillance (3) antibody (3) immunoassay (3) line (3) adult (3) Testing (3) Cases (3) Hepatitis E (3)