Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Since the beginning of the year, Nigeria has been gripped by an outbreak of a deadly disease. Lassa fever is one of a number of illnesses which can cause dangerous epidemics, but for which no vaccine currently exists.

Lassa fever: The killer disease with no vaccine