Tests show that the blue-green algae bloom at Jamaica Pond is indeed toxic, according to a press release from the Boston Public Health Commission. Humans and their pets must stay out of Jamaica Pond until officials give the all-clear. That's going to be at least two weeks, since two clean weekly tests in a row are required. The state considers safe levels of this algae to be 70,000 cells per milliliter of water. Tests done Monday showed the Pond's figure at 81,576 cells/milliliter.