From: Anti-viral properties and mode of action of standardized Echinacea purpurea extract against highly pathogenic avian Influenza virus (H5N1, H7N7) and swine-origin H1N1 (S-OIV)
μg/ml EF 1 hour
μg/ml EF 4 hours
IV
strain
Pos.
Ctrl.
Neg.
50
100
200
400
800
S-OIV (H1N1)
+
-
KAN-1 (H5N1)
FPV (H7N7)