Final answer:
The Hib vaccine has been instrumental in decreasing the incidence of bacterial meningitis in children by preventing infections caused by Haemophilus influenzae type B.
Step-by-step explanation:
The nurse developing an inservice about viral and bacterial meningitis should include that the introduction of the Haemophilus influenzae type B (Hib) vaccine significantly decreased the incidence of bacterial meningitis in children. This encapsulated gram-negative bacterium was once a primary cause of meningitis in children aged 2 months through 5 years before the widespread use of the Hib vaccine. The vaccine schedule for Hib recommends doses at 2, 4, and 6 months with a booster at 12 to 15 months of age, leading to decreased morbidity and mortality associated with H. influenzae infections.