 First aid consists of flushing the area thoroughly with water; further treatment is aimed at relieving the local effects.Some millipedes are considered household pests, including "Xenobolus carnifex" which can infest thatched roofs in India, and "Ommatoiulus moreleti", which periodically invades homes in Australia.Other species exhibit periodical swarming behaviour, which can result in home invasions, crop damage, and train delays when the tracks become slippery with the crushed remains of hundreds of millipedes.