Question of the Day #706

Gov. Abbott, staunch mask rule opponent, has ‘breakthrough’ case of Covid-19

From the headline of this article at KCCI.com.

上記の文で、breakthrough caseの意味は？
In the sentence above, what does "breakthrough case" mean?

答えは、コメントに書いてください。
Write your answer in the Comments.

明日、ここに答えを書きます。
I will add the answer and other remarks here tomorrow.

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解答

意味：
英辞郎にまだbreakthrough case等は掲載されてませんが、RNN時事英語辞典に同義語のbreakthrough infectionがあります。

ブレークスルー感染=>ワクチン接種後にも関わらずウイルス感染すること

Answer

According to AP News:

What is a COVID-19 vaccine “breakthrough” case?
It’s when a fully vaccinated person gets infected with the coronavirus.

Examples

• At the time of his positive test, officials said Abbott was fully-vaccinated, making his infection a "breakthrough" case.
• Fully vaccinated people continue to be well protected against severe disease and death, even with Delta, but so-called breakthrough cases, where a person gets infected despite being fully vaccinated, are on the rise. 
• The proportion of breakthrough cases is up from 11% in May, 5% in April, and 2% in March, according to the Los Angeles County Department of Public Health.
• One of the biggest questions about breakthrough cases is how often people who have it may pass the virus to others.
• Breakthrough cases don’t mean the vaccine doesn’t work.

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