"We have every reason to believe, as a matter of fact, that those who
send no reports are satisfied; for if anything goes wrong with the
herds, they do not fail to let us know it at once by special letters.
"Anyhow, thanks chiefly to new veterinary surgeons who do send
reports, we see that in the twelve years, up to 1st January of this
year, we have had exact returns as to 1,788,879 sheep and 200,962
cattle--about half of all those that were vaccinated.
"The mortality among sheep and cattle is slightly higher after the
first vaccination than after the second. This fact seems to us easy to
explain. The animals reported dead include both those that died as the
result of the vaccinations, and those that, being already infected at
the time, died of the actual disease. But, at the time of second
vaccination, the animals are already more or less protected: hence a
lower mortality from the actual disease, and a lower sum total.
"The whole loss of sheep is about 1 per cent.: the average for the
twelve years is 0.94. So we may say that _the whole average loss of
vaccinated sheep, whether from vaccination or from the disease itself
is about 1 per cent_. The loss of vaccinated cattle is still less: for
the period of twelve years, it is 0.34, or about 1/3 per cent.
"These results are extremely satisfactory. It is to be noted
especially that the average annual death-rate from _charbon_, before
vaccination--the average given in these reports--is estimated at 10
per cent. among sheep, and 5 per cent. among cattle. But even if we
put it at 6 per cent. for sheep, and 3-1/3 per cent. for cattle, and
say that the worth of a sheep is 30 francs, and of an ox or a cow 150
francs--which is well below their real value--even then it is obvious
that the advantage of these vaccinations to French agriculture is
about five million francs in sheep, and two million in cattle. And
these figures are rather too low than too high.
2. _Rouget_
"Some years after the discovery of vaccination against _charbon_, M.
Pasteur discovered the vaccine for a disease of swine known under the
name of _rouget_. From 1886, these vaccines were prepared and sent out
under the same conditions as the vaccines against _charbon_. The
following table gives the reports that have come to us of this
disease:[17]--
VACCINATION AGAINST ROUGET (FRANCE).
Public-domain text, read in full here on John Shaqi.
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