Mycobacterium leprae is the bacterium that causes leprosy.

The cause of his lateness was a train delay.

Hansen's disease is a disease with very weak infectiousness.

This bacterium is resistant to antibiotics.

The doctor told him that he might have been infected with leprosy bacteria.

Mycobacterium leprae is the bacterium that causes leprosy.

Last night, a strong lightning roared.

He always greets politely.

He visits our store every week.

Suddenly, a severe thunderstorm hit the town.