There really isn't a simple answer to this. In 1990 or 1991 the CDC reported on one HIV positive dentist with several patients who may have contacted HIV from their treatment. Around the same time the CDC issued guidelines about health care workers with HIV.
http://www.cdc.gov/mmwr/preview/mmwrhtml/00014845.htm

Since that time, there has been increasing concern that these rules should be changed. Here are some links
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=Abstract&list_uids=11365409&query_hl=45&itool=pubmed_docsum
http://www.cdc.gov/ncidod/dhqp/bp_hiv_hp_with.html
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=Abstract&list_uids=11365190&query_hl=45&itool=pubmed_docsum

Generally, this is something that in most cases should be discussed with the health care workers physician - and would depend to a great extent on the duties. Surgical techs - with their hands in the open surgical sites daily may need to be held to a higher standard than a nurse working on a psych unit with little if any exposure to invasive procedures.

YOU ALSO MAY WANT TO CHECK IF YOUR STATE BOARD OF NURSING HAS ANY SPECIFIC REQUIREMENTS ABOUT REPORTING HIV STATUS.

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