Brothels have been additionally used to guard prostitutes and their clients by way of numerous regulations. They face potential deportation, and so do not have recourse to the regulation. Hence there are brothels that will not adhere to the standard legal requirements meant to safeguard public well being and the safety of the employees. An outbreak of syphilis in Naples 1494 which later swept throughout Europe, and which may have originated from the Columbian Exchange, and the prevalence of other sexually transmitted illnesses from the earlier thirteenth century, may have been causes of this change in attitude. The position of prostitution and the law varies broadly worldwide, reflecting differing opinions. This strategy has additionally been adopted by Canada, Iceland, Ireland, Northern Ireland, Norway, France and Sweden.