efficacy of vaccines. at this stage the scientists here saying they believe vaccines could be effective in stopping severe disease, but they don't know yet. and it could take several weeks of lab tests before they know that. already countries around the globe are shutting their doors to this region. the uk putting several countries in southern africa on its so-called red list. parts of the european union, and now asia also shutting the door because of the possible risk this vaccines will pose. there are plenty -- that this virus will pose. there are plenty of vaccines available in south africa, but uptake has been slow. scientists stress that vaccines are important and that people need to take them. the next few days will be critical to see how this transmits through this region and around the world. israel, the latest country, saying that travelers from malawi did go to that country and test positive for the variant.