Written by Joan Roman, Bob Sprague, Patch Subscribe UPDATED, Feb. 19: People 65 and older and those with at least two health concerns that make them more susceptible to serious Covid-19 complications are eligible for vaccinations beginning Thursday, Feb. 18, reported Patch, a YourArlington partner, but the state vaccine web site crashed that, frustrating the hopes of many, BostonGlobe.com reported. Another frustration: Local health boards were told Feb. 18 that vaccine supply from the U.S. government remains "extremely constrained." The result for Arlington's vaccination efforts will be limited to homebound individuals, directing residents to mass vaccination clinics. For now, no new vaccination clinics will be scheduled, but second-dose clinics will be conducted.