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GCSE Combined Science · key term
A communicable disease caused by the bacterium Mycobacterium tuberculosis, usually affecting the lungs.
Used by OCR
Specification B6.3c · Biology Paper 2
Revise: Disease InteractionsHIV and tuberculosis show how one communicable disease can increase the risk from another. HPV and cervical cancer show how a communicable infection can lead to a non-communicable disease.
Explain each link in the chain: HIV damages immune cells → weaker immune defence → greater risk of active tuberculosis.
HIV is a virus; tuberculosis is caused by a bacterium. HIV does not turn into tuberculosis.
Use ‘increases the risk’ rather than suggesting that everyone with HIV develops tuberculosis or everyone with HPV develops cancer.
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