Moderna, a Massachusetts-based company, has produced and tested its COVID-19 vaccine with a small number of people.

They were tested showing immunity against the virus afterwards.

According to the drugmaker, the vaccine called mRNA-1273, which is in three different dosage levels of 25, 100 and 250 micrograms, were given to 45 participants, and all of them developed detectable antibodies.

However, the eight people who received doses of 25 and 100 micrograms in March responded best, developing antibodies that were just as high or higher than the antibodies found in people who had gotten the coronavirus and then recovered, the US company said.

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