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Has horsepox become extinct?
  1. José Esparza, MD,PhD
  1. Senior Advisor, Global Health (Vaccines), Bill & Melinda Gates Foundation, Seattle, Washington, USA
  1. E-mail: Jose.Esparza{at}gatesfoundation.org

Abstract

Mystery surrounds the extent to which horsepox virus may have contributed to the vaccinia virus used to eradicate smallpox. With few documented cases of horsepox in recent years it may never be solved, says José Esparza, who seeks to raise awareness of the potential historical and  scientific importance of identifying new cases.

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