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: Germany could see 100,000 infections a day if the third wave of coronavirus spreads unchecked, the head of the RKI public health institute has warned.

Coronavirus: Germany tightens borders amid alarm over pandemic