Three hundred and eighty people in Japan came down with COVID-19 today.
There were 380 new cases of the Coronavirus throughtout Japan today.
ーThree hundred and eighty people in Japan came down with COVID-19 today.
「今日、全国で380人がコロナに感染しました」
to come down with ... で「…になる・…にかかる」
「全国で」は in Japan と言えば大丈夫ですよ。
ーThere were 380 new cases of the Coronavirus throughout Japan today.
「今日、全国でコロナの新規感染者数は380人でした」
new cases of ... で「…の新規感染者数」
throughout Japan で「全国で」とも言えます。
ご参考まで!