BOVINE TRYPANOSOMIASIS IN HYDERABAD STATE         243

Others flies are:—
        (i) Hæmatopota sp. (?)
        (ii) Lyperosia exigua.
        (iii) Sp. of Musca and Sarcophaga.

The ticks, collected from animals affected with trypanosomiasis, are :—
        (i) Hyalomma ægyptium.
        (ii) Hæmaphysalis bispinosa.

The blood smears from some of the crushed ticks were found negative for
trypanosomes.

                        AN OUTBREAK OF THE DISEASE.

This was seen in Lonvelly on 22nd September 1933. Thirty-seven cases were
reported from this village and Arelli (close by) from the middle of September to the
end of November 1933. Of these, 12 were found positive for trypanosomiasis by
microscopic examination. The following table sums up in brief the attacks and
deaths:—

For a period after infection the animal appears to be quite healthy, feeds and
works normally. Therefore the owners work them as usual and only become aware
of the disease when the stage of fatality sets in.

In the course of routine blood smear examination four cases were detected, one
of which showed no signs of illness even the temperature being 101.4° F. but the
peripheral blood showed about one trypanosome per ten fields. Another case
showed dullness and mucous discharge from the eyes, but ruminated. The temper-
ature was 105.4° F. and the blood revealed 20 to 30 trypanosomes per field.

The apparently healthy but affected animal is used for ploughing and fatigue
following acts as a predisposing cause in bringing about the onset of the fatal stage.
In this stage the animal stops to feed and ruminate, is disinclined to move, sways
the whole body backwards and forwards and foams at the mouth. The muzzle is
dry and hot and there is discharge from the eyes and nose. Dullness and fever are