Trying to understand the panic call for booster vaccination wgen a month ago we were patting ourselves on the back for majority being fully vaccinated, now suddenly both those vaccinations are worthless and a booster is necessary and suddenly going to protect us against a variant that has many mutations. Have the scientists tweaked the booster or not, if not, how can they be sure of its effectiveness against omicron . I work in the NHS and not hearing of local hospitals being overwhelmed with people with covid. However we are chronically short staffed because people have had a positive covid test, and very mild symptoms in many cases. Why arent we building capacity in the NHS