466 A MANUAL OF BACTERIOLOGY 



enteritidis, summer diarrhoea, cholera, and possibly anthrax, and 

 also the ova of certain worms, may be conveyed. 



The ordinary house-fly breeds in dung and garbage containing 

 dung, and it has a possible range of flight of about a mile. The 

 house-fly experimentally infected remains grossly infected for at 

 least three days, and a smaller degree of infection persists for ten 

 days or even longer. 1 



1 See Reports to the Loc. Gov. Board on Flies as Carriers of Infection, 

 Nos. 1-4, 1910 and 1911. Martin, Brit. Med. Journ., 1913, i, p. 1. 



