A peptide having the following amino acid sequence:
Z1-LEAIPMSIPPEVKFNKPFVF-Z2 (VIRIP)
and its biologically active fragments and/or variants and/or derivatives, especially
amidated, acetylated, sulfated, polyethylene glycol (PEG) modified, phosphorylated
and/or glycosylated derivatives, and peptides obtainable by multiple synthesis
which have the biological activity of VIRIP;
wherein Z1 and Z2 are independently a sequence of from
0 to 10 amino acid residues, and if Z1 or Z2=zero amino acid
residues, then Z1=H and/or Z2=COOH.