A cholera outbreak in Nigeria has killed more than 90 people and infected thousands since May, with the country's northeastern region bearing the brunt of the disease, local authorities have said.The northeastern state of Borno recorded more than 85 deaths and 8,457 cases between May 1 and June 7, according to the state government, with Maiduguri, the state capital, being the hardest-hit area due to high population density and overcrowded displa…