Abstract: Infection by a Coronaviridae virus (e.g., a coronavirus) and/or illness due to a Coronaviridae virus are treated or protected against by administration of a therapeutically or prophylactically effective amount of certain nucleoside compounds and derivatives thereof, either alone or in a composition comprising the nucleoside compound or its derivative and a pharmaceutically acceptable carrier. In addition, replication of a Coronaviridae virus is inhibited by administration of the nucleoside compounds and derivatives thereof, either alone or in pharmaceutical compositions. The nucleosides are particularly suitable for use in treating or prophylaxis of an infection by the SARS virus and/or in treating or prophylaxis of SARS, and for use in inhibiting replication of the SARS virus. The nucleoside compounds and derivatives can optionally be administered in combination with other agents active against the Coronaviridae virus and/or an illness due to the virus.

Abstract: The present invention provides nucleoside derivatives which are inhibitors of RNA-dependent RNA viral polymerase. These compounds are inhibitors of RNA-dependent RNA viral replication and are useful for the treatment of RNA-dependent RNA viral infection. They are particularly useful as inhibitors of hepatitis C virus (HCV) NS5B polymerase, as inhibitors of HCV replication, and/or for the treatment of hepatitis C infection. The invention also describes pharmaceutical compositions containing such nucleoside derivatives alone or in combination with other agents active against RNA-dependent RNA viral infection, in particular HCV infection. Also disclosed are methods of inhibiting RNA-dependent RNA polymerase, inhibiting RNA-dependent RNA viral replication, and/or treating RNA-dependent RNA viral infection with the nucleoside derivatives of the present invention.

Abstract: Dioxobutanoic acids substituted with piperidine or similar N-substituted saturated cycloalkyls are found to inhibit the cap-dependent endonuclease of influenza virus. These compounds are useful in the prevention or treatment of infection by influenza virus and the treatment of influenza, either as compounds, pharmaceutically acceptable salts, pharmaceutical composition ingredients, whether or not in combination with other antivirals, immunomodulators, antibiotics or vaccines. Methods of treating influenza and methods of preventing or treating infection by influenza virus are also described.

Abstract: Dioxobutanoic acids substituted with piperidine or similar N-substituted saturated cycloalkyls are found to inhibit the cap-dependent endonuclease of influenza virus. These compounds are useful in the prevention or treatment of infection by influenza virus and the treatment of influenza, either as compound, pharmaceutically acceptable salts,. pharmaceutical composition ingredients, whether or not in combination with other antivirals, immunomodulators, antibiotics or vaccines. Methods of treating influenza and methods of preventing or treating infection by influenza virus are also described.

Abstract: A surface structural protein of Hepatitis A Virus (HAV) has been isolated and characterized from virus grown in tissue culture. This 33,000 dalton viral protein (VP-1) reacts with immune HAV sera and monoclonal antibodies that neutralize HAV infectivity. The VP-1 is usable for the preparation of a polypeptide subunit vaccine for HAV.Hybridoma cells were made which produced monoclonal antibodies to HAV or VP-1. These monoclonal antibodies were found to neutralize the infectivity of HAV and to compete with polyclonal antibody derived from human HAV immune sera. The monoclonal antibodies are useful for the neutralization of infectious HAV, the detection of antibodies to neutralizing sites on HAV, and the diagnoses of HAV disease in humans and other susceptible hosts.