Table 2.

Viability of Syphacia muriseggs in the environment

	No. of eggs counted		Hatching rate (%)
Week	Control	Experimental	Control	Experimental	P (χ2 test)
4	35	208	85.7	77.4	nonsignficant
8	211	94	86.7	84.0	nonsignficant
12	3	137	100.0	58.4	nonsignficant
16	135	54	94.1	88.9	nonsignficant
20	67	34	82.1	61.8	< 0.05
22	260	68	85.0	76.5	< 0.05
24	66	261	81.8	46.7	< 0.01
26	207	54	90.8	81.5	< 0.05
28	17	318	82.4	30.5	< 0.01
30	90	91	81.1	69.2	< 0.05

S. muris eggs can remain viable in the environment for at least 30 wk from time of collection. Control eggs were collected during the previous 24 h, and experimental eggs were aged 4 to 30 wk prior to testing in the hatching protocol.