if (something) catches a cold, (something else) gets pneumonia

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if (something) catches a cold, (something else) gets pneumonia

When a person, group, or entity has a problem or experiences a negative situation, a related person, group, or entity will consequently have a worse problem or will experience a more negative situation. If Paris catches a cold, Europe gets pneumonia. Terrorism in France affects security throughout the continent.
See also: catch, get, if, pneumonia
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