These cases are interesting on account of the reports by the Egyptian Authorities that East Coast I'ever has occurred, and is still occurring, amongst Sudanese cattle exported to Egypt.

'I'he most recent work by Brumpt (Ann. Parasit Humaine et Compares, April 1923) emphasises the difficulty of distinguishing between the Theileria parva, mutans and annulatum infections by microscopical examination, especially in view of the fact that plasma bodies have now been found in all three infections.

Both Sergent and Brumpt are of opinion that the species ddieileria annulatum should be removed, leaving only parva and mutans. It will thus be seen that the relationship and differentiation of the Theileria has been made a matter of some difficulty by the most recent observations.

Formerly the presence of the plasma bodies was held to be diagnostic of East Coast Fever, and the diagnosis as East Coast Fever of cases having small piroplasms in the blood, and plasma bodies in the spleen and lymphatic glands was justified, but this no longer holds good.

The post-mortem lesions of the two diseases are also similar.

I am therefore of the opinion that the authorities in Egypt are not justified in diagnosing isolated cases as East Coast Fever, and from the available evidence I think it doubtful if East Coast Fever exists in the Sudan, excluding the Southern Border.

The possibility of East Coast Fever extending over the Southern border from Uganda must be admitted.

(iii) Strangles.

Work on Strangles was carried out in connection with the outbreak of the disease amongst the horses of the mounted troops at Shendi.

Two strains of the Streptococcus equi were isolated from cases of Strangles with unopened abscesses in the sub-maxillary glands.

Five hundred doses of vaccine were prepared from the two strains.

A total of 170 horses were vaccinated against the disease.

Vaccination of the horses was completed on 7-10-1923.

The disease gained entrance into the vaccinated Units (No. 3 Coy. Mounted Infantry, and 2nd. Squadron Cavalry) on 8-10-23 and 13-10-23 respectively, but up to 25-10-23 only three cases had occurred.

Comparing these figures with those of No. 2 Coy. Mounted Infantry, where the disease commenced and no vaccination was carried