Moderna (NASDAQ: MRNA) announced positive results today from an early stage clinical study of its novel coronavirus vaccine candidate mRNA-1273. The phase 1 clinical study included three cohorts with 15 participants in each between the ages of 18 and 55. Each cohort was given a different dose of mRNA-1273 -- either 25 micrograms, 100 micrograms, or 250 micrograms. Early but promising Moderna reported that two weeks after the second dose (day 43), participants receiving the 25 microgram dose of mRNA-1273 had levels of antibodies that bind to the novel coronavirus at similar levels to those seen in patients who have recovered from COVID-19. Ten participants who received the 100 microgram dose of the vaccine candidate had levels of binding antibodies at day 43 that were significantly higher than levels seen in patients who have recovered from COVID-19. Image source: Getty Images. The most important thing that researchers are looking for in the early stage study is neutralizing antibodies that prevent the novel coronavirus from infecting a person. Moderna said that data was only available at present for the first four participants in the 25 microgram and 100 microgram cohorts. The levels of neutralizing antibodies in each of these eight participants at day 43 were at or higher than levels generally seen in patients who have recovered from COVID-19. Moderna reported that mRNA-1273 was "generally safe and well tolerated." It said that all adverse events lasted only for a short time and resolved themselves. Next steps Moderna now plans to add a 100 microgram dose cohort to its phase 2 study of mRNA-1273 based on the early stage study data. The company hopes to begin a phase 3 study of its coronavirus vaccine in July that could lead to a regulatory filing if all goes well. 10 stocks we like better than Moderna INCWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now… and Moderna INC wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of April 16, 2020 Keith Speights has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.Source