A file containing documents relating to an outbreak of smallpox in Yugoslavia. Subjects covered in the file include the cancellation of political and sporting events; efforts by the Yugoslav government to obtain twenty million doses of the smallpox vaccine; and cases of smallpox reported in Belgrade, Kosovo, and Sarajevo. Other subjects discussed in the file include the closure of the Yugoslav border with Bulgaria; the tightening of controls at Yugoslavia's borders with other countries; the British view that the outbreak did not constitute a natural disaster and so aid could not be gifted; and the containment of the outbreak after several weeks. Documents in the file include a special issue of the journal World Health on the subject of smallpox, which includes the finding that the disease had been introduced into Yugoslavia by a traveller from Iraq.