Table 1. HA inhibitory activity of gp-340 preparations.

The results are expressed as the means±S.E.M. of four or more experiments testing the ability of the gp-340 preparations to inhibit 40 HA units of the indicated viral strains. The concentrations shown are minimal amounts of the proteins (in ng/ml) needed to achieve complete inhibition of the virus. *P<0.05 compared with either lung gp-340 or salivary gp-340 of donor 2. ND, not done.

		Amount required for inhibition (ng/ml)
			Salivary gp-340
Viral strain	Sialic acid binding preference	Lung gp-340	Donor 1	Donor 2
Phil82	α(2,6)-Linkage	312±43	291±69	268±38
Braz79	α(2,6)-Linkage	341±77	347±75	ND
PR-8	α(2,3)-Linkage	275±25	74±3*	204±51
Sendai	α(2,3)-Linkage	ND	126±8*	245±10
Phil82/BS	α(2,6) and α(2,3)-Linkage	210±37	84±12*	ND