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An additional malnutrition problem is a deficiency in vitamin A. It is especially prominent in the Northern Province, the KwaZulu/Natal, the Mpumalanga, the North West Province, and the Eastern Cape of South Africa. The South African Vitamin A Consultancy Group (SAVACG) conducted a national survey for the South African Department of Health that showed that one out of three children under the age of six have a Vitamin A deficiency. Vitamin A is necessary for good vision, and a shortage of this substance can lead to visual impairments and potentially even blindness. The World Health Organization showed that half of Vitamin A-deficient blind children die within the year, due to the detrimental effects of Vitamin A on the immune system.