http://www.william-shakespeare.info/bubonic-black-plague-elizabethan-era.htm
Views of the Sceptics
The connection between this Rhyme was made by James Leasor in 1961 in his non-fiction book ' The Plague and the Fire. Some people are sceptical of the plague interpretations of this rhyme, many stating that words in the rhyme cannot be found in Middle English. The sceptics must be referring to the later version of the rhyme, possibly with American origins, the English version is "Ring a ring o' rosies" using the Middle English "o" as a shortening of the word "of". The written word " posies" is first mentioned in a poem called 'Prothalamion or A Spousal Verse' by Edmund Spenser (1552-1599). We believe that this addresses the views of the sceptics.