Explore how our bodies are designed to prevent potentially harmful objects from getting inside, and what happens when foreign organisms or substances breach these barriers.
In this piece, which we’ve picked to mark World Tuberculosis Day on 24 March, we visit South Africa to explore the problems associated with a type of tuberculosis (TB) called XDR-TB. This type of TB is resistant to both first- and second-line drugs, meaning that there are very few treatment options left for patients. What is the impact of this disease on the people and the country? What can be done to limit the spread of this dangerous infection?
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Each issue of 'Big Picture' comes with a sprinkling of Fast Facts, fascinating snippets of information on the topic covered.