The pathogens described are:
Pathogenic bacteria:
Enterovirulent Escherichia coli group (EEC Group)
Parasitic protozoa and worms
Viruses
Natural toxins
Other pathogenic agents
External links:
... than simply tense are expressed) are organized into four 'systems' (plus gerunds and infinitives, along with such creatures as intensives[?]/frequentives[?], ...