. >> reporter: darryl gould wasn't eating or sleeping and add fever. s told his mother, rehn ngata, they had to admit him to the hospital. >> it is scary because's only nine months old. >> reporter: darrylle was diagnosed with bronk yo light talk to inflammation of the lower air ways in the lungs, typically caused by rsv. >> i like to think of it as the cop jests you get in your nose when you're cold but in your lower lungs causing breathing problems there. >> reporter: rsv infections can be serious, the leading cause for hospitalization among infants and 7% of all childhood deaths are caused by rsv-related pneumonia. >> it's one of the more serious viral diseases that afflict children. also, elderly people can get infected or sick, particularly people older than 65 years old. >> reporter: but doctors say new research may be able to save some of those lives. scientists at the national institutes of health say they're close to developing a new vaccine, using complex technology. researchers created 3-d models of the virus before it invades the body. from