There are a number of viruses that are associated with the development of hives.
Herpes Simplex (the virus responsible for cold sores) and Epstein-Barr virus (responsible for Mono) are two of the most common.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=9104539&query_hl=12&itool=pubmed_DocSum
There are a number of other infections that are associated with hives
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=10354011&query_hl=12&itool=pubmed_DocSum
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