[New developments in the problem of animal and human paragonimiasis].

A possibility of participation of reservoir hosts (mammals) in the biological cycle of trematodes of the genus Paragonimus, which has recently been experimentally proved, is discussed. A man can become infected with paragonimiasis not only through raw crawfishes and crabs but also through unboiled meat of some mammals. The authors found out that man can serve as a reservoir host of these trematodes too. The larval (muscular) form of paragonimiasis discovered by the authors was already recorded from over 100 patients. New species and subspecies of Paragonimus and their certain characters are reported.