An expected resurgence of H1N1 flu this fall could infect up tp 50% of the US population, causing up to 90,000 deaths, according to projections released yesterday. Most deaths would occur among children and young adults in a scenario involving inadequate antiviral supplies and large outbreaks at schools before vaccinations have time to take effect, CNN reports. The report urged speedier production of an initial batch of vaccine for the most vulnerable segments of the population. (More H1N1 virus stories.)