Humans, birds and fish can all be affected by PSP toxins. Herbivorous zooplankton is the primary transvector which can in turn transmit the toxin to fish and possibly other marine creatures which consume zooplankton (Baden 1983). The usual route for humans is the consumption of raw or cooked contaminated shellfish.
The definition of obstinate is extremely stubborn and determined to have your own way. An example of obstinate is a person who drives during a severe hurricane despite major warnings not to do so. obstinate. not easily subdued, ended, etc. obstinate.
1 Old; firmly established by long continuance; of long standing; obstinately deep-rooted; as, an inveterate disease; an inveterate habit. ( 2 of a person) Having habits fixed by long continuance; confirmed; habitual; as, an inveterate idler or smoker.3  Malignant; virulent; spiteful. 4) afford complete testimony for the prevalence of Baalism as late as the exile, but prove that the clearest distinction was then drawn between the pure worship of Yahweh the god of Israel and the inveterate and debased cults of the gods of the land.