This status makes him ''S1’’ or ''Serial 1’’ in the eyes of epidemiologists who published a paper on the outbreak in the New England Journal of Medicine. In line with all other Ebola outbreaks the scientists did not have to look far for ''S2’’, the boy’s three-year-old sister who died a few days later, ''S3’’, his mother, ''S4’’, his grandmother, and so on as the viral infection sped through the community claiming the village nurse, ''S5’’, and local midwife, ''S6’’, who took the disease out of the village and to her own community. The spread had begun.