Several factors—including economics, climate and population—are all likely contributors, experts say.
Healthy body temperature boosts ability of immune system to fight the virus.
Lilly Vanden Bosch, 10, says good riddance to a nasty post-transplant virus.
Researchers in Brazil detect symptoms similar to multiple sclerosis.
Researcher envisions routine immunizations within a decade.
Can snapshot from the past be useful in the present?
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