evidence: Mayotte's imported cases have arrived mostly from the neighbouring Comoros, which has been battling a cholera epidemic since the start of the year. [...] Mayotte is France's 101st and poorest administrative region and anti-immigrant groups have launched protests against new arrivals despite a vow from Paris to tighten citizenship rules. Part of the Comoros archipelago, Mayotte voted to remain part of France in 1974, when the other three islands sought and won independence.