Bacteria   can   be  pathogenic  by
   releasing toxins.
<P>
<BR><LI> Exotoxins are secreted proteins.
<BR><LI> Endotoxins   are  lipid  components  of  bacterial  membranes  and
released when they die.
Lyme  disease is caused by the spirochete Borrelia burgdorferi and
transmitted by deer ticks.