Roses and tetanus

One of my garden club members who is a florist but not a gardener
has been told at her hospital that anyone who works with roses 
should have a tetanus shot every five years instead of the usual
seven.  I come from a background that equated tetanus with 
barnyards and puncture wounds like stepping on a nail.  Any
wound that bled feely was considered no threat of tetanus.  
I guess by extension a rose prick could be considered a puncture
wound, and if the rose had been fertilized with manure, there could
possibly be a connection.  But it seems to me that the threat
would extend to all gardeners - not just rose handlers.  Any 
thoughts or information on the subject?
Auralie

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