KU Leuven (Belgium) has designed 7 possible vaccines against corona, around the vaccine against yellow fever. They have been working on this for the past months and have tested these vaccines for the first time today on gerbils. Gerbils are more susceptible to corona than mice, and also infect each other. Two of the vaccines have shown tremendous potential (the rest of them showing "some" effect). The reason for starting from the 80 year old vaccine against yellow fever, is that this vaccine is very safe, has proven to be extremely effective for almost a century, and only needs one shot... for life. They put part of the genetic code of the corona virus into the yellow fever vaccine. There are currently about a 100 vaccines being developed worldwide. Usually, by the time vaccines are tested on humans, only 10% of vaccines are left, that actually prove effective.