A national blood supply crisis has been declared by the American Red Cross, with blood donations at a four-year summer low. This shortage is not meeting the demand from hospitals, leading to limited distribution of type O blood. The Red Cross typically sees a drop in blood supply during the summer, but this year's heat and cyclosporiasis are exacerbating the issue.

As a result, the organization is struggling to maintain an adequate supply of blood. Further details on the crisis and how to help in Tarrant County are available from the American Red Cross and local news sources.