The rash of dengue fever in the acute stage of the infection blanches when pressed In some people, the disease proceeds to a critical phase as fever resolves.[9] During this period, there is leakage of plasma from the blood vessels, typically lasting one to two days.[10] This may result in fluid accumulation in the chest and abdominal cavity as well as depletion of fluid from the circulation and decreased blood supply to vital organs.[10] There may also be organ dysfunction and severe bleeding, typically from the gastrointestinal tract.[7][10] Shock (dengue shock syndrome) and hemorrhage (dengue hemorrhagic fever) occur in less than 5% of all cases of dengue,[7] however those who have previously been infected with other serotypes of dengue virus ("secondary infection") are at an increased risk.[7][15] This critical phase, while rare, occurs relatively more commonly in children and young adults.[9] The rash that commonly forms during the recovery from dengue fever with its classic islands of white in a sea of red. The recovery phase occurs next, with resorption of the leaked fluid into the bloodstream.[10] This usually lasts two to three days.[7] The improvement is often striking, and can be accompanied with severe itching and a slow heart rate.[7][10] Another rash may occur with either amaculopapular or a vasculitic appearance, which is followed by peeling of the skin.[9] During this stage, a fluid overload state may occur; if it affects the brain, it may cause a reduced level of consciousness or seizures.[7] A feeling of fatigue may last for weeks in adults.[9]