मोनफ्रोम 2-3 बोसोरफोराव, जों मायसिननि मोनसे गोदान जोलै जौगाहोयो आरो 2-3 बोसोराव बेफोरो होबथा बेकतेरिया उजिनायनि थाखाय उदायि जायो।
Every 2-3 years we develop a new generation of mycin and in 2-3 years they become ineffective due to growth of resistant bacteria.