HAMILTON - Hamilton police have taken the unusual step of issuing a public warning after charging a woman with sexual assault.

They allege a woman has been having sexual encounters without first telling her partners about her medical condition, as is required.

April Dawn Bullock, 30, has been arrested and charged with sexual assault.

Police believe there may be more victims and are urging anyone with information to contact them.

They are advising anyone who has had sexual contact with Bullock since 1997 to go see a doctor immediately.