Florida health officials investigating two more Zika infections that may have been spread by local mosquitoes, bringing the total number of suspected local cases to four.<br />Officials have yet to confirm how the infections were contracted, but any kind of spread between native mosquitoes would be a major change in the course of the disease in the continental U.S.<br />The FDA has asked all blood donation centers in Miami-Dade, Broward and surrounding areas to stop accepting blood donations until the blood can be tested for the virus.
