immediate reaction n.
An allergic or immune response that begins within a period lasting from a few minutes to about an hour after exposure to an antigen to which the individual has been sensitized.
That is precisely the reason for this title: to provoke an immediate reaction.
My immediate reaction was, “Gee, he works for the drug company.”
The temptation is to dismiss this sense of injustice as merely the immediate reaction to the outcome of the Zimmerman trial.