An outbreak of dengue fever has spread to more Indian states with hundreds of additional cases of the mosquito-borne infection being reported, officials said on Saturday. Eight more people died over the past two days taking the death toll to 46, while the number of infected people rose by more than 400 to 3,331. The disease, which began spreading in late August and was first detected in the national capital New Delhi, has now been reported from 12 of the country's 29 states. The new states include Tamil Nadu, Karnataka and Kerala in the south, Gujarat in the west, and West Bengal in the east. "It's a serious problem," federal health secretary P.K. Hota told Reuters. "It is certainly a failure because we know this will happen each year but still we can not take adequate action against it."