Scientists are catching up to what parents and other caregivers have been reporting for many years: When some people with autism spectrum disorders experience an infection that sparks a fever, their autism-related symptoms seem to improve.With a pair of new grants from The Marcus Foundation, scientists at MIT and Harvard Medical School hope to explain how this happens in an effort to eventually develop therapies that mimic the “fever effect” to similarly improve symptoms.“Although it isn’t actually triggered by the fever, per se, the ‘fever effect’ is real, and it…