Despite the uncertainty, the sudden prevalence of grasses might have encouraged the evolution of hoofed animals well adapted to graze on the new resource.
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Except for a sudden high prevalence of the Pfdhfr triple mutant haplotype (52%) observed in 2007 in the control zone, a general trend of increase of Pfdhfr triple mutant (3M) parasites was noted from 2006 to 2010 in both groups: from a prevalence of 7% and 17% in 2006 to 64.3% and 64.6% in 2010 for the control and IPTi/c zones, respectively (χ = 23.7; P ≤ 0.001).
Seven athletes (0.6%) were identified with a disease associated with sudden death; this prevalence was two times higher in black athletes than in West-Asian athletes (1% vs 0.5%), and no cases were reported in Caucasian athletes and West-Asian controls.
Putting infants to sleep on their backs, recommended since the early 1990s, has helped reduce the prevalence of sudden infant death syndrome.
But that argument pivots on old data, including outdated numbers on the prevalence of sudden cardiac death, and fails to take into account improvements in the standards for interpreting EKG results, said Dr. Jonathan Drezner, an associate professor of family medicine at the University of Washington and vice president of the American Medical Society for Sports Medicine.
Although it is not possible to clearly identify the mechanism responsible for the sudden increase in the prevalence of G. destructans in late February and March, these data suggest that shorter winter periods should be associated with lower prevalence.
In the 1990s, there was a sudden increase in the prevalence of ischemic heart disease, with a subsequent increasing tendency.
A sudden increase in the prevalence of lesions could act as an early warning system for an emerging disease or indicate a new outbreak of an old one.
The prevalence of sudden death in connection with sporting activity is about 4.6 people out of 10,000,000 per year in an average population.
The later samples (May 2 and 6), however, saw a sudden increase in the prevalence of rosaceous woody taxa and a corresponding decline in Acer, Fraxinus, and T. officinale.
