Some of these small parasites have been mutating and are now resistant to many over-the-counter medications.
As Governor of Massachusetts in 2005, Mitt Romney required all Massachusetts hospitals, including Catholic ones, to provide emergency contraception to rape victims, even though some Catholics view the morning-after pill as a form of abortion.
Republican rival Newt Gingrich has already raised that decision on the campaign trail. Will it become an issue for primary voters, or in the general election against President Obama? President Obama is also under fire, from Roman Catholic bishops, for issuing an order last month requiring religious institutions to provide free birth control to employees.