Virulence is the qualitative or quantitative assessment of pathogenically which measures the degree of the disease that is caused by pathogens.
Virulence factor which is produced by e. Coli 0157:h7and could cause the heart and lung damage include
(i) Capsular and flagella antigens
(ii) Type 111 secretion systems
(iii) Shiga-like toxins (SLTS)
(iv) Endotoxin.
E. coli0157:h7 is not complicated most patients fully recover after about ten days and it is self-limiting. It can be spread through milk, cheese, yoghurt, tomatoes and soya beans.