Tuberculosis is transmitted by close contact with infected people. The BCG vaccine is effective in preventing the more serious forms og tuberculosis in children. Vaccination should be considered for those under 16 years of age who are going to live or mix with local people for more than 3 months. Older travellers may be considered for vaccination if at risk due to thier work or activities. Boosting this vaccie is not recommended. The Manoux skin test is generally required prior to BCG vaccination