Viruses and bacteria cause diseases of vast economic importance. Siali
dase inhibitors offer an opportunity to prevent or ameliorate these di
seases. They have been investigated ostensibly as antiviral agents par
ticularly against influenza viruses. The patent literature covering si
alidase inhibitor compounds, their design and synthesis is reviewed fr
om 1995 to mid-1998 with reference to the primary scientific literatur
e. Patents are discussed by company or institution. The importance of
different compound types is indicated.