Further reports (no. 4) on flies as carriers of infection.

Date:: 1911

Catalogue details

Licence: In copyright

Credit: Further reports (no. 4) on flies as carriers of infection. Source: Wellcome Collection.

47/52 (page 45)

No. of fly- Legs. Wings. Head. Crop. Intestine. >• 2. 3. 4. 5. 6. 1. 2. 18 + 4 + 4- 0 0 4- 4- 0 + + 19 + 4- 4- + 4- 0 4- + 0 4- + 20 +° + 4* 4- 4- + + + ! + 4- + 21 0 0 0 0 0 0 + o I 0 0 0 22 + 0 0 0 0 0 0 01 4 0 0 23 + 0 0 0 0 0 0 0 0 0 0 24 + 0 0 0 0 0 + 0 0 0 0 25 0 0 0 0 0 0 0 0 0 0 0 26 + 0 0 0 0 0 4- 4“ i 0 0 0 27 0 0 0 0 0 0 + o ! 0 0 4“ 28 + 0 0 0 0 0 0 — 0 0 0 29 0 0 0 0 0 0 0 0 0 0 0 30 0 0 0 0 0 0 0 0 0 0 0 31 0 0 0 0 0 0 0 0 0 0 0 32 0 0 0 0 0 0 0 0 0 — 0 33 + 0 0 0 0 0 0 0 + 0 0 34 + 0 0 0 0 0 4- 0 0 0 0 35 +* 0 0 0 0 0 0 0 0 0 0 36 0 0 0 0 0 0 0 0 0 0 0 37 0 0 0 0 0 0 0 0 0 0 0 38 0 0 0 0 0 0 0 0 0 0 0 39 0 0 0 0 0 0 0 0 0 0 0 40 0 0 0 0 0 0 0 0 0 0 0 41 0 0 0 0 0 0 0 0 0 0 0 42 0 0 0 0 0 0 0 0 0 0 0 43 0 0 0 0 0 0 0 0 0 0 0 44 0 0 0 0 0 0 0 0 0 0 0 45 0 0 0 0 0 0 0 0 0 — 0 46 0 0 0 0 0 0 0 0 0 — 0 47 0 0 0 0 0 0 0 0 0 0 0 48 0 0 0 0 0 0 0 0 0 — 0 49 0 0 0 0 0 0 0 0 0 — 0 50 0 0 0 0 0 0 0 0 0 — 0 51 0 0 0 0 0 0 0 0 0 0 0 Age. j- Two days old. Three days old Six days old. Ten days old. Eleven days old. j- Fifteen days old. Nineteen days old. ) Twenty-two days j old. I Twenty-three | days old. ) Twenty-nine days j old. Thirty days old. f Thirty-three days f old. Cultures proved to be virulent. It should be pointed out that organisms of the B. subtilis type were very commonly present in these cultures, and no doubt occa- sionally overgrew the anthrax bacilli. A few other experiments were carried out with these flies. Four flies were allowed to walk over agar plates a few hours after emerging. Numerous colonies of B. anthracis developed on these plates. Twelve flies a few hours old were kept in a glass cage and fed on syrup. Shortly after their first meal some of the remains of the syrup on which they had been feeding was smeared on the surface of agar plates. Numerous colonies of B. anthracis developed on these plates. Nearly every fly very shortly after emerging de- posited a large quantity of whitish, semi-fluid material. Cultures made from this material were negative. The faeces deposited by flies two days old contained B. anthracis in considerable numbers, as also did the remains of syrup on which they had fed.