The pathogens described are:
Pathogenic bacteria:
Enterovirulent Escherichia coli group (EEC Group)
Parasitic protozoa and worms
Viruses
Natural toxins
Other pathogenic agents
External links:
... equation touches the x-axis in a single point.) If the discriminant is positive, then there are two different solutions x, both of which are real. (Geometrically, this ...