* Obama says sealing off region could exacerbate Ebola * WHO promises review of its handling of Ebola * Canada says it will ship vials of experimental vaccine to WHO * British PM: EU should pledge $1.3 bln for Ebola, send help (Adds details on GlaxoSmithKline development of vaccine, 800 people contacted by Frontier Airlines) By Roberta Rampton WASHINGTON, Oct 18 (Reuters) - With three cases of Ebola diagnosed in the United States but dozens of people being monitored in case they contract the disease, President Barack Obama urged Americans on Saturday not to give in to "hysteria" about the spread of the virus. Obama also made plain he is not currently planning to give in to demands from some...
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