In 1968 a pandemic was caused by an influenza A (H3N2) virus. from an avian influenza A virus. It was first noted in the United States in September 1968. The estimated number of deaths was 1 million worldwide and about 100,000 in the United States. Most excess deaths were in people 65 years and older. The H3N2 virus continues to circulate worldwide as a seasonal influenza A virus. Seasonal H3N2 viruses, which are associated with severe illness in older people, undergo regular antigenic drift. I don't remember any quarantine or shutdowns in 1968....do you ?