An outbreak of measles in 1886 resulted in 113 cases and 8 deaths. Jamestown was lighted for the first time in 1888, the initial cost being borne by the inhabitants. Dinuzulu kaCetshwayo, son of the Zulu king Cetshwayo, was exiled at St Helena between 1890 and 1897. Diphtheria broke out in 1887 and also in 1893 which, with an additional outbreak of whooping cough, led to the death of 31 children under 10. In 1890 a great fall of rock killed nine people in Jamestown, a fountain being erected in Main Street in their memory. A census in 1891 showed 4,116 inhabitants lived on the island. A submarine cable en route to Britain from Cape Town was landed in November 1899 and extended to Ascension by December and was operated by the Eastern Telegraph Company. For the next two years over six thousand Boer prisoners were imprisoned at Deadwood and Broadbottom. The population reached its all-time record of 9,850 in 1901. Although a number of prisoners died, being buried at Knollcombes, the islanders and Boers developed a relationship of mutual respect and trust, a few Boers choosing to remain on the island when the war ended in 1902. A severe outbreak of influenza in 1900 led to the death of 3.3% of the population, although it affected neither the Boer prisoners nor the troops guarding them. An outbreak of whooping cough in 1903 infected most children on the island, although only one died as a result.

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