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Cowpox is a contagious
viral disease of cows and is a mild form of smallpox. It has been
around for hundreds of years. There are many hosts of the disease
including voles and woodmice even spreading to cats. The last
recorded case of a cow with cowpox in the UK was in 1978. There
are about 1-4 cases in man per year.
As the disease progresses
the cows develop pustular eruptions, particularly on the udders
and teats. People can catch cowpox by direct contact with an infected
animal. People infected
with cowpox are immune to smallpox which is a much more serious
disease.
People can catch cowpox by direct contact with an infected animal
and they then go on to develop pustules, on their hands.
These are quite painful and there is a general feeling of being unwell. The incubation period is about 1 week and the illness lasts about 4-6 weeks. There is a full recovery.
It had always been noticed
in rural communities that dairy maids who caught cowpox would
never get smallpox- they were immune.
This was investigated by Edward Jenner in 1796 and the vaccine
for smallpox produced. This effectively wiped out smallpox which
was a major killer at the time.