Sentence examples for have not circulated from inspiring English sources

Influenza viruses of the H2N2 subtype have not circulated among humans in over 40 years.

Another mechanism of influenza virus evolution, antigenic shift, which occurs at a lower frequency, involves the replacement of HA and/or NA with new antigenic virus subtypes that have not circulated in humans viruses for a long time [6].

Thank God they had not circulated my name within the airport.

The strain has not circulated in humans since 1968, so much of the global population has no immunity to the strain.

But he said his agency had not circulated them or updated them for the nuclear threat or issued public warnings or organized any drills.

"The virus has not circulated within airplanes to a wide number of people within airplanes and we have no reason to believe that it is circulating in airports," Dr. Heymann said.

Tommy Davis told me, "People started calling me, saying, 'What's this letter Paul sent you?' " The resignation letter had not circulated widely, but if it became public it would likely cause problems for the church.

Workers with access to natural light and fresh air that has not circulated endlessly through a building's air-conditioning system seem to get ill less often and avoid symptoms of "sick-building syndrome" associated with the sealed towers built in the 1970s, when energy costs were high.Building green is more expensive.

So far, the H5N1 influenza subtype has not circulated in the human population.

In agreement with this explanation, the baseline HAI titer for H1N1 A/New Caledonia, which had not circulated dominantly for several years [2], [3], was comparable between the '04-N and '04-T groups (data not shown).

The isolate was assigned to the ST-7, a genotype that has not circulated in Burkina Faso since 2003.