It is a small gram negative bacillus.
 

Haemophilus influenzae in blood agar
Haemophilus influenzae meningitis

Oesophagus has rich longitudinaly running lymphatics which facilitate metastatic spread. Also oesphagus is the only area of the GIT which has no serosal covering which is also favourable for metastais.

Destruction of RBS’s with release of hemoglobin and other red cell contents into the plasma.

Presence of excess hemoglobin in plasma. Normally hemoglobin is located within the red blood cells. When there is increased hemolysis, hemoglobin is rapidly released into the plasma resulting in hemoglobinemia.