For herd immunity to occur, the vaccine must prevent transmission of the virus as well as prevent disease.

a stag dance; a stag party; a stag bar

They cook well overall, but their true speciality is pasta.

The operator went out on to the platform with his handlamp and waved it in the traditional wash-out signal across the body. The engineer had been expecting this and responded at once with an acknowledging honk on the horn before bringing this huge, 16-car train gently to a stand at the platform.