The outbreak has also shuttered nearly every movie theater in China.
The company's stock is up 40% since the beginning of the year.
Seth Kubersky, who wrote the "Unofficial Guide to Disneyland," says the new attraction is a way for Disney to compete with the Harry Potter-themed worlds at Universal theme parks.
It was created by Walt Disney and fellow illustrator Herb Ryman in just one weekend to woo theme park investors in 1953.
Long lines — some more than 4 hours — await visitors.