 Although he had many contacts, none of them developed the disease, and an aggressive containment campaign was successful in preventing an outbreak.Smallpox was declared to have been eradicated globally by the World Health Organization (WHO) two years later.Maalin was subsequently involved in the successful poliomyelitis eradication campaign in Somalia, and he died of malaria while carrying out polio vaccinations after the re-emergence of the poliovirus in 2013.