‹‹‹ prev (216) Page 37Page 37

(218) next ››› Page 39Page 39

(54) Page 38 -

                                      38

Direct sunlight kills it within half an hour. Ten minutes
at a temperature of 70°C. destroys it. It is very easily
killed by drying.

The question of how the bacillus remains alive outside
the animal body between the outbreaks of the disease is an
important one.

It is just possible that the Hæmorrhagic Septicæmia
bacillus like the Plague bacillus has, under favourable condi-
tions, greater powers of resistance outside the animal body
than Laboratory experiments would lead one to expect.

                  Reaction of Nutrient Media.

Gelatine is not liquefied.

No gas is produced in growing.

A peculiar sour odour emanates from old cultures.

Alkaline media become acid from the growth of the
bacilli.

Milk is neither coagulated nor acidified.

                           Temperature.

The best temperature for growth is below the temper-
ature of the body, namely, 30°C.

                           Agglutination.

There is no relation between the agglutinating powers
of an animal's serum and its natural powers of resistance
against the disease.

NORMAL SERUM OF HILL BULL 9501. EMULSION FROM AN H. S.
                                          AGAR CULTURE.

Pure
serum.

1/10.

1/100.

1/500.

1/1000.

Within 15 minutes ...

+ +

+

-

-

-

NORMAL SERUM OF HILL BULL 9502. EMULSION FROM AN H. S.
                                          AGAR CULTURE.

Pure
serum.

1/10.

1/100.

1/500.

Within 15 minutes ...

+

+

-

-

Images and transcriptions on this page, including medium image downloads, may be used under the Creative Commons Attribution 4.0 International Licence unless otherwise stated. Creative Commons Attribution 4.0 International Licence

Takedown policy