When a new drug or procedure is investigated in a trial, data is collected about the number of patients who either die or suffer from a severe reaction/disease caused by the under trial drug/procedure.

So morbi-mortality of a given drug/procedure is the number of patients per 1000 who either die or suffer from a severe damage due to drug or procedure.

Ex: If morbi-mortality of bypass surgery is 80, and a new procedure 'XYZ' lowers this rate to 15, we can say procedure 'XYZ' benefits morbi-mortality of heart patients.

Now since we understand the true meaning of 'morbi-mortality', it can be translated as ਬਿਮਾਰੀ-ਮੌਤ ਦਰ, whole sentence can be translated as

ਮਰੀਜ਼ਾਂ ਵਿੱਚ ਇੰਟਰਫੈਰੋਨ ਇਨਹਿਬਿਟਰ ਆਈਵਾਬਰਾਡੀਨ ਦੇ ਬਿਮਾਰੀ-ਮੌਤ ਦਰ ਸਬੰਧੀ ਫਾਇਦੇ