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Blockade titers against GII.4 P domain-HBGA (A) and GII.17 P domain-HBGA attachments (B) using human sera collected from a GII.17 outbreak. Acute- and convalescent-phase serum samples (5 asymptomatic controls and 10 symptomatic cases) were collected during an outbreak. The fold increases from acute- to convalescent-phase serum in blockade titers (green columns) were determined (right-hand y axis).
