Many people in that village caught cholera.
Many people died in the cholera epidemic.
海外旅行ではコレラに注意してください。
Please be careful about cholera when traveling abroad.
19世紀にはヨーロッパでコレラが流行した。
Cholera spread through Europe in the 19th century.
コレラ is the disease cholera, while コロナ refers to the coronavirus (or a solar corona), so despite the similar katakana sound they are unrelated diseases/concepts.
Standard katakana spelling; the word is usually written in kana.
Ateji spelling, rarely used.
Ateji spelling, rarely used.
Borrowed from Dutch cholera, ultimately from Latin cholera.