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Covid vaccines growth is impressive but the volume of doses is a concern: WHO
World Health Organization (WHO) is encouraged by the growth in the number of vaccines against COVID-19 that have performed well in clinical trials, although the organization remains concerned by the limited number of doses currently available, Bruce Aylward, a senior WHO adviser, said on Friday.A handful of candidate vaccines against COVID-19 have reported efficacy levels of greater than 90 per cent in clinical trials, and Aylward noted that multiple vaccine platforms have shown strong results."If you look week by week at the number of companies that are announcing positive results in terms of the efficacy of vaccines, that number is increasing and what's important is it's increasing not just in terms of the number of products, but also the