A child is diagnosed to have acute gastroenteritis. The consulting pediatrician wants to send a stool sample to a lab which is 16-18 hours away. Which of the following mediums should he use to send this sample –

In acute gastroenteritis stool culture should be obtained as early as possible. "Fecal specimens that cannot immediately be plated for culture can be transported to the laboratory in a non-nutrient holding medium such as Carry-Blair to prevent drying or overgrowth of specific organisms".