A week after fifty cows were confirmed to have died from anthrax, in northern Colorado, two more have been found.
The first fifty had all been from the same ranch, and authorities had been sure that the disease would not spread.
However, both of the new cows were from two separate neighboring ranches, showing that it did in fact spread.
Workers on the ranches, and nearby ones, as well as students and staff at CSU who were near the autopsy which discovered the anthrax, have begun taking antibiotics to prevent the disease spreading to them.
All the rest of the cows, on the three ranches, as well as others, are being vaccinated as well, to ensure that it does not spread any further.
No cattle left any of the ranches since well before the cows died, so authorities are confident that it could not have spread beyond the area.
Anthrax is capable of lying dormant in soil for decades, until it is ingested by human or animal.
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