TORONTO—Residents in long-term care will start receiving COVID-19 vaccines within days, and more than half of Ontarians—including some in the general population—are slated to be immunized by mid-summer, the head of the province’s inoculation campaign said Tuesday. In an update on Ontario’s COVID-19 vaccination plan, retired Gen. Rick Hillier said the province expects to receive roughly 50,000 doses of the Moderna shot on Wednesday, and distribute them to long-term care and retirement homes. Immunizations should begin at those sites within 48 to 72 hours after the vaccine is received, he said as the province marked another record high in new daily COVID-19 infections. Another 50,000 doses of the Moderna vaccine are expected to arrive in Ontario next month, largely earmarked for remote northern and Indigenous communities, he said. The province hopes to have inoculated more than a million health-care workers and people in other vulnerable groups by the end of …