Factors Affecting the Hatching of Ova of Schistosoma japonicum

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Abstract
Because the mature ova of S. japonicum do not hatch within the tissues or the feces of the definitive host, the authors studied the factors which influence this phenomenon. The following conclusions were drawn: 1) The ova of S. japonicum require relatively clean water in which to hatch or at least water which has a sufficient quantity of O2. 2) Ova will not hatch at mammalian body temps. but readily hatch at temps. encountered in tropical waters. 3) Ova will not hatch in the presence of concs. of NaCl as small as 0.7%. 4) Ova, even though they mature, do not hatch aberrantly in the body of the host because of the elevated temp. and the presence of NaCl in sufficient conc. to prevent hatching. 5) Miracidia are most active between 28[degree] and 33 [degree] C and become sluggish and usually die after 30 minutes'' exposure to 37[degree]C. 6) Miracidia are killed by exposure of 2 min. to a conc. of NaCl as great as 1.3%. They are adversely affected within a few min. in consc. as low as 0.66%, in which they survive for approx. 1 hr. After exposure of 1 hr. to a conc. of NaCl of 0.2% they are apparently still normal and may infect Schistosomophora quadrasi.

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