english: But the third challenge we have -- and probably even bigger one, the biggest challenge -- is that, in contrast to smallpox where you could always see your enemy -- every single person almost who was infected with smallpox had this telltale rash.
non_english: Maar de derde uitdaging - en waarschijnlijk de grootste - is dat, in tegenstelling tot pokken waar je altijd je vijand kon herkennen - omdat bijna elke persoon die was besmet met pokken die herkenbare uitslag had.