Booster shots rev up immune response to coronavirus variants, Moderna says - CNN

Booster shots rev up immune response to coronavirus variants, Moderna says  CNN Moderna says Covid booster shot generates promising immune response against variants found in South Africa, Brazil  CNBCGiving 2 Doses Of Different COVID-19 Vaccines Could Boost Immune Response  NPRModerna says its Covid vaccine booster works well against variants  NBC NewsTweaked Moderna vaccine 'neutralises Covid variants in trials'  The GuardianView Full Coverage o