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According to Professor Alex Welte from the SA Centre for Epidemiological Modelling and Analysis, immunity from vaccination may not last as long with the development of more Covid-19 variants.

Alex welteSa centre for epidemiologicalWorld health organizationInternational coalition of medicines regulatory authoritiesProfessor alex welteEpidemiological modellingInternational coalitionMedicines regulatory authoritiesScott gottliebSa centre for epidemiological modellingSpf 50Albert bourlaUs food and drug administrationSunday timesReaking newsSunday times