Bill Adams was halfway back from Mars when he noticed the red rash on his hands. He'd been reaching for one of the few remaining tissues to cover a sneeze, while scratching vigorously at the base of his neck. Then he saw the red spot, and his hand halted, while all desire to sneeze gasped out of him.

He sat there, five feet seven inches of lean muscle and bronzed skin, sweating and staring, while the blond hair on the back of his neck seemed to stand on end. Finally he dropped his hand and pulled himself carefully erect. The cabin in the spaceship was big enough to permit turning around, but not much more, and with the ship cruising without power, there was almost no gravity to keep him from overshooting his goal.

He found the polished plate that served as a mirror and studied himself. His eyes were puffy, his nose was red, and there were other red splotches and marks on his face.

Whatever it was, he had it bad!

Pictures went through his head, all unpleasant. He'd been only a kid when the men came back from the South Pacific in the last war; but an uncle had spent years dying of some weird disease that the doctors couldn't identify. That had been from something caught on Earth. What would happen when the disease was from another planet?

It was ridiculous. Mars had no animal life, and even the thin lichenlike plants were sparse and tiny. A man couldn't catch a disease from a plant. Even horses didn't communicate their ills to men. Then Bill remembered gangrene and cancer, which could attack any life, apparently.

He went back to the tiny Geiger-Muller counter, but there was no sign of radiation from the big atomic motor that powered the ship. He stripped his clothes off, spotting more of the red marks breaking out, but finding no sign of parasites. He hadn't really believed it, anyhow. That wouldn't account for the sneezing and sniffles, or the puffed eyes and burning inside his nose and throat.

Dust, maybe? Mars had been dusty, a waste of reddish sand and desert silt that made the Sahara seem like paradise, and it had settled on his spacesuit, to come in through the airlocks with him. But if it contained some irritant, it should have been worse on Mars than now. He could remember nothing annoying, and he'd turned on the tiny, compact little static dust traps, in any case, before leaving, to clear the air.

He went back to one of the traps now, and ripped the cover off it.

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