Answer from dr Shrouq ElTanany كلام ال NHS انك طالما متأكد من ال vaccination history يبقى If your child did not have this reaction to the vaccine, it does not mean that they have not responded to it. There's no need to vaccinate with BCG a second time. بعض المصادر الأخرى كاتبين Since it is clinically impossible to distinguish between failed vaccination and failure to develop scar in spite of immune response, the better clinical option is to give BCG a second time. و في الحالة دي لما تدي التطعيم للمرة التانية ما تستناش ظهور scar ،، يعني بردو هتعتمد ع التأكيد من ال history ،، لان ممكن ياخده للمرة التانية و بردو ما يظهرش scar في رأي تالت بقى انك تعمل TST الاول Tuberculin skin test should be carried out. If negative : give a second BCG vaccination. This revaccination is given in the RIGHT arm. It’s not necessary to inspect this scar. يعني بردو هتعتمد ع ال history يافندم و الاثبات أنه اتاخد انت ممكن تدي مرتين و بردو ما يظهرش scar و ممكن تعمل TST و يطلع false negative لأسباب بالنسبة ليا انا ،، هعتمد ع ال history و ال document اللي مكتوب فيها ان التطعيم اتاخد و مش ههتم بحوار ال scar -------------------------------------------------------- طيب في حالة نسيان الام للتطعيمات عموما A general principle if we are uncertain whether a vaccine dose was given or there is no documentation, the dose in question should be given. لكن في حالة ال BCG تحديدا BCG vaccination will almost invariably result in tuberculin conversion with a positive tuberculin skin test developing 4–8 weeks after vaccination المفروض يعمل TST بعد ٤-٨ اسابيع من وقت ال administration المحتمل عند الولادة .. If negative, give BCG ( intradermal) If positive, he is immune. طيب لو اخده مرتين فعليا بدون التأكد الاول ب TST ؟! In most cases it won't cause any harm as such, but you need to keep a close eye on any swelling you see around the vaccination site. unpleasant side effects may occur Such as regional Lymphadenitis or large abscess at the injection site. و لكن فيه حالات كتير بتاخده بالغلط مرتين و ما بيحصلش حاجة ..