The national leprosy elimination campaign has been intensified, with the launch today of an intensive survey in eight States and three Union Territories to search out hidden cases of the deaded disease.The six-day long survey was launched in Pondicherry, Andhra Pradesh, Karnataka, Madhya Pradesh, Punjab, Chandigarh, Bihar, Assam, Nagaland, Sikkim and Dadra & Nagar Haveli.