Sera from four Australian elapids and one boidid (python) were tested
for their ability to protect neonatal mice against the toxic action of
tiger snake (Notechis scutatus) venom. Of the five serum samples test
ed, only serum from Pseudechis australis and Pseudechis porphyriacus w
ere capable of neutralizing the tiger snake venom. In addition, neutra
lization was shown to be highly variable within serum taken from indiv
idual snakes of the same species (P. porphyriacus). Previously, only v
iperid and colubrid snakes have been shown to possess neutralizing fac
tors against snake venoms.