1.   But efforts to isolate a virus failed, and experts considered the presumed agent a contaminant of no significance.

2.   But when the scientists inoculated animals in the laboratory with blood samples taken from the woman, they isolated a virus that they were unable to identify.

3.   In fact, they say, patients living with animal organs do so under guidelines designed to isolate potential viruses.

4.   So Gross injected material from leukemic mice into newborn mice of a strain known to be free of the leukemia, thus isolating a virus.

5.   The following year, however, at a Merck laboratory in Pennsylvania, Dr. Maurice Hilleman and Dr. Ben Sweet isolated the virus.

6.   The new drugs, called neuraminidase inhibitors, attack both the A and B strains by isolating the virus and keeping it from reproducing.

7.   The viruses were isolated by Dr. Elizabeth M. Cosper and Kristen L. Drewes Milligan at the State University of New York at Stony Brook.

8.   Primi and colleagues have deciphered genetic sequences from the virus, and now are trying to isolate the virus itself, the company said.

9.   Scientists have isolated a virus blamed for causing blindness in tens of thousands of kangaroos.

10.   The scientists, believing their quick action had isolated the virus before it spread, were relieved.