Article: Additive Made Spores Deadlier; 3 Nations Known to Be Able to Make Sophisticated Coating

The anthrax spores that contaminated the air in Senate Majority Leader Thomas A. Daschle's office had been treated with a chemical additive so sophisticated that only three nations are thought to have been capable of making it, sources said yesterday.

The United States, the former Soviet Union and Iraq are the only three nations known to have developed the kind of additives that enable anthrax spores to remain suspended in the air, making them more easily inhaled and therefore more deadly, experts said yesterday. Each nation used a different technique, suggesting that ongoing microscopic and chemical analyses may reveal more about the spores' provenance than did their genetic analysis, ...

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