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Cowpox
- Research Ethics Timeline (National Institute of Environmental Health Sciences)Medical Ethics/Learn More ... Medical Ethics ... National Institute of Environmental Health Sciences ... From the National Institutes of Health ... A research ethics timeline ...
- Smallpox (Mayo Foundation for Medical Education and Research)Smallpox/Start Here ... Smallpox ... Mayo Foundation for Medical Education and Research
- Glossary of Vaccine Terms (Centers for Disease Control and Prevention)Vaccines/Reference Desk ... Vaccines ... Childhood Vaccines/Reference Desk ... Childhood Vaccines ... Centers for Disease Control and Prevention ... Glossary of terms used on ...