The biological threat - News Beware of a Santa letter laced with anthrax The US Postal Service (USPS) warns that even the appearance of a letter to Santa fits the description of mail that should put Americans on notice this holiday season. |  Read Latest anthrax death baffles authorities The death from anthrax of an elderly woman in rural Connecticut has revived fears of bioterrorism across the US and deepened official bewilderment over the spread of the disease. Investigators are still unable to identify the source of the anthrax outbreaks, which have affected at least 23 people and caused five deaths since the September 11 terrorist attacks. |  Read US in talks on vaccines to fight bio-terrorists The US government is in talks with California-based biotechnology company Large Scale Biology to produce vaccines against smallpox, polio and other diseases that may be used by bio-terrorists. |  Read