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The constitution of the World Health Organisation was signed on 22 July 1946 by representatives of 61 governments and came into force on 7 April 1948. This is commemorated as World Health Day and since 1962 many countries have issued stamps on this day to promote and advertise each year’s different health theme. The first stamps appeared for the campaign “The world united against malaria”. Other themes have included “Early detection of cancer saves lives” (1970) and “The fight against drug abuse” (1976). In 1972 the World Health Day theme was “Your heart is your health” and a selection of philatelic designs appeared from countries across the world. The stamps from Chile and Pakistan bear the date of the World Health Day and the title of the 1972 campaign. The 50 franc stamp from Cameroon was issued in 1973 to commemorate the 25th anniversary of the World Health Organisation. The colours were carefully selected to depict the venous and arterial circulations with both halves of the stamp showing the heart and great vessels.