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xray ray hole vector vectors illustration illustrations seamless pattern skin test mantoux circulatory system background color colors colorful art sickness mycobacterium bacteria virus infectious lung lungs infection human illness medical medicine tb treatment tuberculosis support pulmonary sick healthy respiratory cancer care biology awareness anatomy day disease health diagnosis cure design healing international concept banner world march poster red respire science bronchi anatomical patient organ oxygen breathe sign icon internal unhealthy trachea hospital smoking flat symbol chest abstract