I'll start with the single biggest strain on the nation's health and health care budget: cigarette smoking.

Dr. Ward said the single strain was a potential advantage because it would lower the cost and make quality control easier.

Phenotype data obtained from members of the three groups listed below should often be collapsed and treated as a single strain.

All it had taken was a single strain of chlorine-fixing microbes.

Current rules cover only a single strain of the potentially deadly bug, yet the other strains cause about 112,000 illnesses each year.

I don't think we're dealing with a single strain of it anymore.

The common assumption that the funguses are all derived from a single strain, they found, was only half true.

The Irish quickly became dependent on it and developed a single strain, the lumper.

After dozens of transfers, no single strain came out on top.

Often the band only plays the introduction, a single strain, and the coda.