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. 2007 Sep 2:365–393. doi: 10.1016/B978-012263951-7/50013-2

Table VII.

HAI Interpretation

Hemagglutination
Antigen	Control	Result
+	−	Negative
−	−	Positive^a
+	+	Agglutination^b

^a

Positive if antibody titer s ⩾ 10 or 20, depending on viral antigen.

^b

Result considered nonspecific.