Probably the most interesting properties of elderberry extracts were reported by Zakay-Rones et al. (1995). Following earlier work done by Konlee (1998), these authors reported that a mixture containing elderberry extract had an inhibitory effect on haemagglutinin found in mycovirus. More work done by Barak et al. (2001, 2002) have shown that such a mixture could inhibit the replication of 11 strains of the influenza virus and increase cytokines production.
Zakay-Rones, Z., N. Varsano, M. Zlotnik, O. Manor, L. Regev, M. Schlesinger, and M. Mumcuoglu. 1995. Inhibition of several strains of influenza virus in-vitro and reduction of symptoms by an elderberry extract (Sambucus nigra L.) during an outbreak of influenza b in Panama. J. Altern. Complement. Med. 1:361–369.