The transfer of food poisoning bacteria
by flies to mice and the subsequent
retransfer from infected mice to
flies, with apparent ease of transmission
of infection, mark these insects as
potential health hazards wherever food
that is to be eaten raw is being prepared.
Whereas it was found 5. 6 that
the strain of Salmonella enteritidis used
in these experiments produced a high
incidence of fatalities in mice in 13
days or less, only 2 of the 6 mice
infected through flies died, 1 on the
41st day and the other on the 59th
day after infection. Although the strain
used has been shown to be highly fatal
for both rats and mice when fed by
stomach tube, in the present studies
the rodents survived for considerably
longer periods of time. It is not possible
to say whether this may be associated
with a loss of virulence of this
organism or from other factors. However,
it is worthy of mention that in
some dissociation studies not yet completed
both coliform bacteria and Salmonella
enteritidis produced a number
of variants on passage through flies,
and this may have some bearing on
the ability of those mice infected
through flies to survive infection.
The transfer of food poisoning bacteriaby flies to mice and the subsequentretransfer from infected mice toflies, with apparent ease of transmissionof infection, mark these insects aspotential health hazards wherever foodthat is to be eaten raw is being prepared.Whereas it was found 5. 6 thatthe strain of Salmonella enteritidis usedin these experiments produced a highincidence of fatalities in mice in 13days or less, only 2 of the 6 miceinfected through flies died, 1 on the41st day and the other on the 59thday after infection. Although the strainused has been shown to be highly fatalfor both rats and mice when fed bystomach tube, in the present studiesthe rodents survived for considerablylonger periods of time. It is not possibleto say whether this may be associatedwith a loss of virulence of thisorganism or from other factors. However,it is worthy of mention that insome dissociation studies not yet completedboth coliform bacteria and Salmonellaenteritidis produced a numberof variants on passage through flies,and this may have some bearing onthe ability of those mice infectedthrough flies to survive infection.
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