trickle of vaccine. eventually, it will grow to a stream. and then a river. reporter: boxes of the vax seen have begun arriving at the health departments and clinics, though officials only ordered 34,000 doses of the vaccine for delivery this week, which will only cover a fraction of the estimated 2.9 million marylanders, considered most at risk. but state health officials say more vaccine is on the way. the federal government has dmit commit has committed to vaccinate every marylander. we will continue to order that, according to what is available to maryland. reporter: h1n1 disproportionately affects children. like 14-year-old destiny. and st. vincent pilate is closing after confirming five cases of h1n1. with 100 students absent from school tuesday. concern like those are why a vaccination was put on a fast track, with researchers playing a key role in the development and testing of the vaccine. demand for that vaccine is so high today, the federal government is mo