Study on suivival of Salmonella paratyphi A in outside environment

  Objective   To observe the survival of S.Paratyphi A in outside envionment such a the razor clam, water and the surface of object, and to provide experimental basis for preventing and controlling the epidemic of Paratyphoid fever A.

  Methods   The razor clam was bred in the seawater contaminated adequate S.Paratyphi A, then putit at different temperatures and observed the alive time of S.Paratyphi A. S.Paratyphi A was adequately added in seawater, well-water, rive-rwater, polluted water and running-water, then put them at different temperatures and observed the alive time of S.Paratyphi A The drying glass contaminated adequate S.Paratyphi A was put at different temperatures, then observed the alive time of S.Paratyphi A.

  Results   S.Paratyphi A could live for over 10 days in the body of razor clam bred at 4~8℃; S.Paratyphi A could live for 3 days in well-water, river-water and polluted water, less than 6h in running-water, 3~5 days in seawater under 27℃ and 1~2 days over 27℃, 1~2 days on the drying surface that didn't absorb water.

  Conclusion   S.Paratyphi A could live in the body of razor clam till it died and for a long time in seawater at lower temperature than in well-water, rive-rwater, running-water and polluted water.The higher temperature of the surroundings was the sooner dying.