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: A "significant" cluster of the South African Covid-19 variant has been found in two areas of south London where surge testing has been implemented.

Covid: South African variant in Wandsworth and Lambeth surge test areas