There are no overall tax breaks for hiring foreign nurses for positions in the US -- however, many health care companies, being privately run, feel that the salaries paid to these foreign nurses are less costly in the long run than if they paid out the salary and benefits to US nurses. My bet is that these foreign nurses cost the company a lot less money than hiring some US nurses for the same position would cost and that is why the company continues to hire these particular nurses (they are probably using the same company over and over again -- that's why the nurses are from the same places).
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