One scabbed sheep will infect a whole flock.
More German Proverbs:
As good eat the devil as the broth he was boiled in.German
To the looker-on no work is too hard.
German
Blaming is easy; doing better is more difficult.
German
Brandy is as lead in the morning, silver at noon, and gold at night.
German
The unrighteous penny consumes the righteous dollar.
German
Bacchus hath drowned more men than Neptune.
German