Table 1.

Percentage of hemagglutination reactivity of human erythrocytes incubated with chitosan nanoparticles.

Solution [mg/mL]	Hemagglutination (%)*
	++++	+++	++	+	±	Indeterminate**
Solution A [0.4]	—	—	—	—	—	100
Solution A [1.0]	—	—	—	—	—	100
Solution A [1.6]	—	—	—	—	—	100
Solution A [3.0]	—	—	—	—	—	100
Solution A [0.4]***	100	—	—	—	—	—
Solution A [1.0]***	100	—	—	—	—	—
Solution A [1.6]***	100	—	—	—	—	—
Solution A [3.0]***	100	—	—	—	—	—
Solution B [0.4]	—	—	—	—	—	100
Solution B [1.0]	—	—	—	—	—	100
Solution B [1.6]	—	—	—	—	—	100
Solution B [3.0]	—	—	—	—	—	100
Solution B [0.4]***	—	—	—	100	—	—
Solution B [1.0]***	—	80	—	—	20	—
Solution B [1.6]***	—	90	10	—	—	—
Solution B [3.0]***	—	100	—	—	—	—

^*Percentage of the wells compatible with Stavitsky (1954) [18].

^**Indicates the percentage of the samples that showed color modification that distorted the visual definition of the hemagglutinating event.

^***Neutralized solution by the addition of NaOH 1 mol/L⁻¹.