The least common and most severe reaction to a vaccine is

An acute health effect is manifested when

a. an injury, disease, or death that is caused by exposure to a substance develops slowly over a few days, weeks, or longer periods. b. an injury, disease, or death that is caused by exposure to a substance, develops rapidly and quickly comes to a crisis. c. an injury or disease of relatively short duration is caused by exposure to a substance and from which recovery occurs rapidly. d. an injury or disease caused by exposure to a substance occurs only after an extensive time period has passed.

In a ____, the retina lifts up from the posterior portion of the globe, interrupting its blood supply and causing ischemia.

A. subconjunctival hemorrhage B. retinal hemorrhage C. globe rupture D. retinal detachment