In previous antibiotic drug development, "you would always look for the one molecule and the one dose that you could use for everything," Entasis Therapeutics Inc. CEO Manos Perros told BioWorld. "Maybe that approach has reached its limit."

The sun has been shining on the biopharmaceutical sector of late as investors have returned to the sector big time. As a result, the BioWorld Biopharmaceutical index grew a healthy 6.6 percent in the second quarter, well ahead of the general markets, thanks to a late June spurt in valuations, causing the index to grow 5.8 percent last month.

Although global private biopharmaceutical companies kept up the first-quarter momentum by raising more than $1.8 billion in the second quarter, both deal volume and deal flow dipped. The total was approximately 15 percent less than the Q1 volume and, according to BioWorld data, 70 companies completed transactions in the period compared to 92 that were inked in the first quarter of this year. U.S. biotech companies were involved in 42 of the total transactions and collectively they raised approximately $980 million, compared to $1.4 billion from 46 deals that disclosed financial terms in the first quarter.