Exactamundo mother dearest, Wyndham (only know his name because I did it for GCSE

) stuck it in his book in the 50s, it appeared in the tv / radio adaptions, Danny Boyle then used it for 28 days later and now zombie films can't start with some handy hospitalisation.
This ridiculous sweeping generalisation comes from just 28 days later and the trailer for walking dead : P