Why does the AstraZeneca COVID-19 vaccine age limit differ across provinces? She said residents at the long-term care centres she oversees were scheduled to get their second dose on April 16, but that was cancelled because of the shortage of Moderna.Eight new cases of COVID-19 were reported in Quebec’s long-term care system on Wednesday, bringing the number of active reported cases to 114.“We do see a jump in the past few weeks, so there is cause to worry,” Zhang said. “There is a sense of urgency to get the second dose in.”She said the second dose of the two-dose vaccine is particularly important for long-term care residents who tend to have weak immune systems and may not respond as well as younger people to the first dose of vaccine..