U.S. rushes to tighten its smallpox defenses
Smallpox -whose world wide eradication more than two decades ago is hailed as public health's greatest triumph has turned from success story to biological weapons specter in the wake of the Sept.11
Smallpox -whose world wide eradication more than two decades ago is hailed as public health's greatest triumph has turned from success story to biological weapons specter in the wake of the Sept.11