'Please do not spit', Anti-spitting poster, London, England, 1969-1987
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Notice, usually printed on paper, intended to be posted to advertise, promote, or publicise an activity, cause, product, or service; also, decorative, mass-produced prints intended for hanging.
An infectious disease that is caused by a bacterium first identified by Robert Koch in 1882. The disease usually affects the lungs first, and is accompanied by a chronic cough.
Micro-organisms which can cause disease but have an important role in global ecology.
Mucus produced by the respiratory system, and expelled by coughing. Healthy phlegm is normally clear and white.