Covid-19 vaccine asymptomatic pandemic

Effectiveness of vaccines to stop Covid-19

Two types of vaccine against Covid-19 are likely to become more available this spring. The mRNA vaccines from Moderna and Pfizer are approved and slowly being rolled out in the US. They both need to be transported and stored at freezing temperatures which makes distribution more difficult. The Oxford vaccine, which only requires refrigeration, will be easier to transport in rural areas and countries with poorly developed medical infrastructure.