Recovery of Trichinella spiralis larvae from frozen muscle samples.

Demonstration of Trichinella spiralis in suspensions of digested muscle tissue has until now mainly been based on methods utilizing the coiling and/or the motility of the living larvae. Considering this, Jackson (1977) estimated that, compared to the number observed by examination of corresponding unfrozen samples, 78 % of larvae in frozen samples would be lost, when an ordinary pepsin-HCl digestion technique was used.