Protozoa and includes E. coli (that's E. coli, not E. coli. Get the difference?), E. gingivalis, E. hartmanni, E. histolytica, E. hartmanni, E. polecki.
Eating the cysts aka fecal-oral. Blech. It is a sexually transmitted disease (PubMed).
SyndromesPubMed). Travel history is can be so important.
Large abscess in the liver may benefit from percutaneous drainage.
In Japan, HIV patients seropostive for E. histolytica had an increased risk of developing invasive disease (PubMed).