When Shiga toxin is released from an E. coli O157:H7 bacterium, it can translocate to organs other than the digestive tract such as the kidneys and central nervous system (brain and spinal cord). This can cause hemolytic uremic syndrome (HUS) and/or thrombotic thrombocytopenic purpura (TTP) .
A strategy called dollar-cost averaging can help reduce risks surrounding an asset falling in price. The concept is straightforward - you invest a fixed amount of money in an asset once every fixed time period.
Also, a great advantage of DCA, says George Smyth of the MotleyFool.com ( Blind Dollar Cost Averaging  , March, 2000), is that the gentle moves into the stock market mean you  can place yourself at the proper comfort level  so you  can certainly sleep better at night  .