US-based drugmaker Moderna on Monday said its Covid-19 vaccine retains neutralising activity and remains protective variants of the coronavirus first identified in the United Kingdom and South Africa. Speaking to the media the company said that vaccination with the Moderna Covid-19 Vaccine produced neutralising titers against all key emerging variants tested including B.1.1.7 and B.1.351 - the two coronavirus variants which were first identified in the UK and South Africa respectively. Moderna Will Test Boosters To Improve Immunity The company said that it will test an additional booster dose of its Covid-19 vaccine (mRNA-1273) to study the ability to further