The first hint to crack the puzzle "19th-century London disease studied by John Snow" is:

It is a word which contains 7 letters

The second hint to crack the puzzle "19th-century London disease studied by John Snow" is:

It starts with letter c

The third hint to crack the puzzle "19th-century London disease studied by John Snow" is:

It ends with letter a

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The answer for the puzzle "19th-century London disease studied by John Snow" is: