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.