Zhèzhǒng bìng de fāshēng gàilǜ wēihū-qíwēi, búbì dānxīn.
The probability of contracting this disease is extremely small - no need to worry.
Tips
memory
微 means 'tiny' and appears at both the start and end of the idiom - the word is itself 'wrapping around' its smallness. Think: 'so small it folds back on itself'.
