Word: bacterias
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...Heredity can, at least in the somewhat limited field of bacteria, be changed and even directed...
Since then, "guided and directed mutation with precisely predictable features" has produced bacteria that mutate after infection with viruses. Formerly harmless strains of diphtheria bacilli will, after viral infection, secrete the poison of virulent diphtheria. Because the bacterial lines breed true, said Dr. Horsfall, both these are cases of "infective heredity" induced by environmental factors...
...West Germany's highly respected Zentralblatt für Bacteriologie, Bacteriologist Heinz J. Dombrowski reported that he had revived dehydrated bacteria preserved in rock salt since the Permian Period 180 million years ago. In Britain's Nature, Dr. George Claus of New York University Medical Center and Chemistry Professor Bartholomew Nagy of Fordham University reported finding dead organisms that may have ridden in from outer space aboard meteorites...
Elaborate Precautions. Dr. Dombrowski got interested in ancient life when he noted that the warm, allegedly curative brine that comes to the surface near his laboratory at Bad Nauheim was full of living bacteria. They could not originate in the soil, he decided, because they are present in the water when it is still 600 ft. below the surface. Besides, they were a type whose modern representatives live in the sea. And along with the bacteria, the brine carried fossil pollen from trees that grew in the Permian...
...will be potential dangers to all life on earth. Though their ship may be sterilized inside and outside before re-entering the earth's atmosphere, it will be impossible to sterilize the men themselves. Like even the healthiest humans, the space travelers will be hives of earthly viruses, bacteria and protozoa, and among these familiar and harmless companions a few microscopic aliens may hide, ready to turn into killers when they reach the earth...