The World Health Organization has issued an unusual statement raising questions about whether Tanzania is covering up possible cases of the deadly Ebola virus, a significant cause for concern during a regional outbreak that has been declared a rare global health emergency. The statement Saturday says Tanzania's government "despite several requests" has not shared its clinical data, the results of its investigations or the possible contacts of a number of patients with Ebola-like symptoms. Tanzania's government, which has said it has no Ebola cases, could not immediately be reached for comment Sunday. The cases would be the first-ever Ebola infections...