RESEARCH IN BRITISH WEST AFRICA. 
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that Baro is the terminus of the Baro-Kano Railway, and that large numbers 
of natives from all parts of the Protectorate are congregated there in connection 
with the railway works. Consequently it is very difficult to say whether the 
infection was actually contracted at Baro or before these natives ever came to 
this town. One of the cases was from Agaie, another from Sierra Leone. 
Sleeping sickness has been reported from Bebua about 30 miles from Bauchi, 
but Capt. Bissell, R.A.M.C., writing on a visit to that region in December 
1910, says :—*“ If sleeping sickness did exist at Bebua it has now disappeared.” 
As has already been mentioned, one case of human trypanosomiasis was found 
at Kateri, and in another part of this report certain recommendations have been 
suggested. 
A segregation camp has been inaugurated near Zaria, and from the point of 
view of transport this region is satisfactory, provided suitable mosquito-proof 
vehicles be used in transferrmg infected cases, a precaution which was adopted 
in the case of those found at Baro. On the other hand it might have been 
better if a site could have been selected in the Lake Chad area, which, so far 
as can be ascertained, is a palpalis-free region. ‘Che number of known cases is 
at present, however, very small, and it is not necessary to conduct such a camp 
on a large scale, but should at any time an epidemic break out the question of 
establishing a camp near Maiduguri might be considered. 
An ordinance ought certainly to be promulgated empowering the Resident on 
advice from the Medical Officer to have patients suffering from trypanosomiasis 
removed to the sleeping sickness camp. 
It is more than probable that the natives of West Africa have acquired a high 
degree of immunity in regard to this disease, but this does not in any way justify 
less stringent measures being adopted. In fact the reverse is the case, inasmuch 
as immune natives may act as reservoirs and thus be a positive source of danger 
to the European population. For this reason every effort should be made to 
segregate the infected and to reduce the chances of transmission by judicious 
clearing in order to effect a diminution in the number of Glossina palpalis which, 
so far as is known, is the only carrier in West Africa. 
Trypanosomiasis of Stock. 
(d) Trypanosomiasis in horses and cattle is very prevalent, and this disease 
accounts annually for a heavy mortality. In this connection I would draw 
attention to the cases cited for Lokoja, Zungeru, the lower Garara River and 
elsewhere in this report. In the case of Lokoja it is no exaggeration to say 
that sixty per cent. of the horses brought into the town develop trypanosomiasis 
within a year, and of these fifty per cent. die of this disease within the same 
period. Further, it is practically impossible to keep a horse in the Bassa 
Province for anything approaching a whole year. 
There would appear to be two different forms of trypanosomiasis, with distinct 
clinical systems. 1 have found both Trypanosoma vivax and Trypanosoma brucei 
in the blood of horses, and although 7. vivax seems to be the more common, 
T’.. brucei would appear to be the more virulent. but here our knowledge of the 
sub,ect ends, It is practically certain that infection is not always carried from 
horse to horse, as has been shown in the case of Bassa, and therefore we have yet 
