question:  What is true about the Red Spot Fever?
context: What with red-spot fever, talking cockatoos and flagpole trees, I was running in circles—especially since Grannie became twins every now and then. If my calculations are right, we've hit it at its narrowest spot." He could be excused this time, however, for this was only our third day on Jupiter's Eighth Moon, and the country was still strange to us. When Annabella C. Flowers, that renowned writer of science fiction, visiphoned me at Crater City, Mars, to meet her here, I had thought she was crazy. If you haven't read her books, you've missed something. She's the author of Lady of the Green Flames , Lady of the Runaway Planet , Lady of the Crimson Space-Beast , and other works of science fiction. Blood-and-thunder as these books are, however, they have one redeeming feature—authenticity of background. It's no use to the people of Earth but of untold value on Mars. I'm not up on the scientific reasons, but it seems that life on the red planet has developed with a supersonic method of vocal communication. Then it was found that this ore, Acoustix, revitalized their sounding apparatus, and the rush was on." "But up until now this moon is the only place where it can be found. So now here we were at the outer reaches of the Baldric, four travelers on foot with only the barest necessities in the way of equipment and supplies. Above us, the great disc of Jupiter began to descend toward the horizon. Apparently these adjustments moved planes or fins on the kite and accounted for the car's ability to move in any direction. Then the Red Spot Fever got them." "Red Spot Fever?" "They walk out into the Baldric," he continued, "and nothing can stop them. "There's all kinds of rumors," he replied, "but none of them will hold water.
output:  Infra-red rays influence people, and they end up lost in the Baldric.
options:  It is contagious, and it is affecting nearly every worker.  There is no known cure for it.  It makes people vanish into thin air.  Infra-red rays influence people, and they end up lost in the Baldric.