Collected papers on trypanosomiasis / by Sir David Bruce and others.

  • David Bruce
Date:
[1909-1911]
Catalogue details

Licence: Public Domain Mark

Credit: Collected papers on trypanosomiasis / by Sir David Bruce and others. Source: Wellcome Collection.

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    F. The Development of Trypanosoma vivax in Laboratory-Bred Glossina palpalis. Table IX.—Development of Trypanosoma vivax in Laboratory-Bred Glossina palpalis. Experiment. No. of flies. No. of days fed on. No. of days before flies became infective. No. of days flies remained infective. 1591 50 4 21 21 1638 25 6 — — 1698 68 4 35 35 1700 60 4 30 30 1870 1 50 p — Five experiments were made with laboratory-bred flies. Three were successful. Experiment 1591. Date. Day of experi¬ ment. Procedure. Result. Remarks. Positive. Negative. 1909. Sept. 2—4 „ 5-6 „ * » 8-9 „ 10—30 Oct. 1—3 1—2 3-4 5 6—7 8—28 29—31 Flies fed on infected calf, 1318 Flies starved. Flies fed on infected calf, 1318. Flies starved. Flies fed on healthy goat, 1652 Flies starved. + 50 flies used. Oct. 4, 35 remaining flies dissected; nega¬ tive except 3, which had infected pro¬ bosces. Remarks.—Fifty laboratory-bred flies were fed for four days on an infected calf; 21 days after their first feed they became infective ; 35 flies remained alive on the 32nd day. On these being dissected three were found with infected probosces. These probosces were not injected into animals, so that it is not known if the flagellates were infective by injection. Experiment 1638. Date. Day of experi¬ ment. Procedure. Result. Remarks. Positive. Negative. 1909. Sept. 6—11 „ 12-13 „ 14—29 1—5 6—7 8—23 Flies fed on infected calf Flies starved. Flies fed on healthy goat, 1682 — 25 flies used. Sept. 29, 23 remain¬ ing flies accidentally killed; negative on dissection. Remarks.—Twenty-five laboratory-bred flies were fed for six days on a calf infected with Trypanosoma vivax, and afterwards for 16 days on a healthy goat. This goat was not infected, and the remaining 23 flies when killed and dissected all proved negative. 0