Sick (1970)

Sickness. Chaos. Death. As the Quarantine Zones fill, bodies pile in the streets. Society crumbles to a wasteland. In the house of Sean and Avery, two do-gooders holding onto desperate hope, survivors find comfort in their final days. Yet no sanctuary of brick and plastic can protect the mind, and Sean finds himself forced to make the ultimate choice as the disease seeps into his home and makes monsters of its inhabitants.