Sentence examples for has not circulated since from inspiring English sources
Given that the subtype H5N1 clade 2.5 virus has not circulated since 2004 and that the clade 2.2 virus was more highly reactive than the clade 2.5 virus, these raccoons were likely infected with clade 2.2 viruses, as supported by timing with poultry outbreaks.
The strain has not circulated in humans since 1968, so much of the global population has no immunity to the strain.
Because WPV2 has not circulated anywhere globally since 1999, immunity to PV type 2 is not being stimulated through virus circulation.
The isolate was assigned to the ST-7, a genotype that has not circulated in Burkina Faso since 2003.
The film, as described in a summary that is circulating among potential backers here, tells the story of an American youth who learns that his Turkish father, whom he has not seen since early childhood, has perished in the quake.
Florida has not lost since.
Van Persie has not scored since.
It has not stopped since.
