The skin test for tuberculosis (TB) , also known as PPD, if positive, indicates that the individual carries TB but does not necessarily have an active infection, or that this person had received the TB vaccine (known as BCG) which is given in Europe and Gulf countries. The finding of something on the chest Xray means there's active TB infection in the lungs. So both show different things. If the skin test is positive we usually treat because of the rise in the number of TB infection in our part of the world.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.