Health experts see his retreat from international cooperation as disrupting the safe-keepers of one of the world’s deadliest pathogens. Health experts see his retreat from international cooperation as disrupting the safe-keepers of one of the world’s deadliest pathogens. Smallpox, World Health Organization, Centers for Disease Control and Prevention, United States Politics and Government, United States International Relations, Trump, Donald J, your-feed-science NYT > Science