Following trial results released yesterday showing Moderna’s vaccine candidate might not be safe for human consumption – apparently, the candidate caused “adverse” reactions in roughly 50% of patients who participated in a recent study – the dozens of companies, universities and governments working on COVID-19 vaccine candidates just received another piece of disheartening news: A growing body of evidence gleaned from research into the virus suggests that antibodies may not offer protection for more than 2-3 months, for many people.