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Session 3: Pathogens and human infectious disease

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This figure gives the names of the infectious diseases in different font sizes and contrasting colours: in the largest font, in yellow – tuberculosis, pneumonia, diarrhoea; in the second-largest font, in red – cholera, meningitis, tetanus; in the third-largest font, in orange – syphilis, diphtheria, typhoid; and in the smallest font, in brown – chlamydia, plague, leprosy, typhus.