Is it possible to fire an employee because of frequent time off related to MS relapses?
Yes it is possible, however the Family and Medical leave Act (FMLA, 1993) allows an employee with a serious medical condition to have unpaid medical leaves (up to 12 weeks per year) and to return to the same position, if he/she is not holding a key job (an example of a key job is being the director of a company). Unpaid medical leaves allow an employee to retain the health insurance benefits paid by for by his/her employer.