4 ms·

In the middle ages they didn't knew about infectious diseases, but they did blame foreigners for plagues or simply "bad luck".

• pessimizer 10y ago
  "In January 1880, an armed British expedition to the island led by 20-year-old Maurice Vidal Portman, the local colonial administrator, arrived to conduct a survey of the island, and to take a prisoner, in accordance with British policy regarding unwelcoming tribes at the time, which was to kidnap a member of the tribe, treat them well and give them gifts, and release them back to the tribe, hoping to demonstrate friendliness. Portman's expedition of the island is believed to be the first by outsiders. While the Sentinelese tended to disappear into the jungle whenever outsiders were spotted approaching, Portman's expedition found an elderly couple and four children after several days. They were taken prisoner and brought to Port Blair. The elderly couple became ill and died, probably from contracting diseases to which they did not have immunity. The four children were returned to the island, given gifts, and released. The children then disappeared into the jungle. After this incident, the British did not try to contact the Sentinelese again and instead focused on other tribes." I imagine that what those children spread amongst the islanders could be what makes them so aggressive to outside contact now.