It is a common experience
in other contagious diseases as well as in glanders
to find incipient cases at the end of an outbreak --
typical occult cases, difficult to diagnose, weakened
cases of the disease in fact.
It is known that animals^have been exposed to
an outbreak are frequently found to have lost condition
and to be otherwise the worse in appearance and health.
Are these animals weakened by an attack of exhausted
virus, and have all the animals that appear to have escaped, also been attacked by a still more weakened virus ?
Is it possible that some of these cases are made immune ?
(When specific fevers attack communities that have already had an outbreak, not only are fewer attacked, but
the disease is less virulent). Or this loss of condition &C. due to exposure and discomfort consequent
upon an outbreak or is it due to the predisposing causes
that allowed the entry into the system of the virus of
I am under the impression that some of '.'the more
experienced veterinarians can point to cases of immunity
against cattle plague "where no visible illness had previously been noticed in the animal, although more 'than
ince exposed to the influence of the disease.