Infectious agents such as bacteria and viruses are the most frequent causes of gastroenteritis in the US and worldwide. Infections cause diarrhea and other symptoms by causing inflammation of the gastrointestinal (GI) tissue.
Remember, your Traditional IRA is tax deferred, while your Roth IRA is tax free... So, assuming a income tax rate of 30%, you really end up with... $20,933.70 in your Roth IRA, but only $14,653.59 in your Traditional IRA. That's the difference between an IRA that's tax deferred and an IRA that's tax free.
The IRS sets limits on the amount of money you can contribute to an after-tax IRA. Your contribution limit will depend on the IRS rules for the current tax year and whether you also contribute to a tax-deferred IRA. As of 2012, the limit if you only contribute to a Roth IRA is $5,000.