HOUSTON – Two people who experienced possible allergic reactions after receiving the Pfizer vaccine in the UK are recovering well, according to UK regulators. However, now there’s a warning for those who have a history of severe allergic reactions, such as those to food, medicine, vaccines or need to carry an epi-pen. “There are people who have had true allergic reactions to vaccines in the past. “Work out a strategy about when and how they can safely receive the vaccine,” McCarthy said. “It may mean they need to receive it in a more monitored environment.”Locally, researchers said they’ve witnessed zero allergic reactions to the vaccines in clinical trials.