Nepali to English:
रोगाणुहरूलाई दुर्बल गरिसकेपछि, उनीहरू आफ्नो रोगात्मक रूपमा उल्टिएर रोग उत्पन्न गर्नु अत्यन्त विरल हुन्छ।
Given that pathogens are attenuated, it is extremely rare for them to revert to their pathogenic form and subsequently cause disease.