What strain of bacteria enters normal epithelial cells most easily

Ty2 strain present in the Salmonella typhi bacteria can easily enter into the epithelial cells.

Explanation:

This is the bacteria that causes the typhoid fever in humans. This disease affects greater than 21 million people worldwide annually. On severe cases it leads to death of the patient. The penetration into epithelium cell is one among the essential part in its parthenogenesis. Previous interaction of the bacteria along with the epithelial cell are much necessary before its invasion. The expression involves the adhesins and fimbria.