question:  What was a common factor with all the victims of 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. Everything else was blanketed by the sand and the powerful wind that blew from all quarters. 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. Blood-and-thunder as these books are, however, they have one redeeming feature—authenticity of background. Grannie Annie was the original research digger-upper, and when she laid the setting of a yarn on a star of the sixth magnitude, only a transportation-velocity of less than light could prevent her from visiting her "stage" in person. He was an old prospector Grannie had met, and he had become so attached to the authoress he now followed her wherever she went. It's no use to the people of Earth but of untold value on Mars. Then it was found that this ore, Acoustix, revitalized their sounding apparatus, and the rush was on." 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. And then all at once Grannie stopped again, this time at the top of a high ridge. As that dot continued to move across the heavens in a single direction, I called Grannie's attention to it. Five minutes later Grannie was shaking his hand vigorously and mumbling introductions. Apparently these adjustments moved planes or fins on the kite and accounted for the car's ability to move in any direction. Up until a short time ago most of them were in excellent health and spirits. Then the Red Spot Fever got them." "There's all kinds of rumors," he replied, "but none of them will hold water.
output:  They had all started seeing symptoms in the barracks
options:  They were all treated in the Baldric  They had all started investigating the odd birds and their strange behavior  They had all started seeing symptoms in the mines  They had all started seeing symptoms in the barracks