Second phase of clinical trials for COVID-19 vaccine expected to finish in July

The second phase of clinical trials for a possible COVID-19 vaccine is expected to be successfully completed in July. A Chinese official says no serious adverse reactions from the trials have been reported so far. There are a total of five different possible vaccines fast-tracked by China's National Medical Products Administration. More than 2,000 volunteers have participated. Researchers are assessing whether or not they are safe and effective.