根据给定的关键字，编写一个简短的新闻标题和文章摘要。
Keyword: COVID-19
Title: COVID-19 cases rise sharply in multiple countries

Summary: As the world continues to battle the COVID-19 pandemic, multiple countries are seeing a sharp increase in the number of cases. Health officials are urging individuals to continue practicing social distancing measures and to get vaccinated. Many countries are also implementing stricter lockdown measures to slow the spread of the virus. It is important for everyone to do their part in preventing the spread of COVID-19 to help protect those who are most at risk.