California’s vaccine supply is set to reach new heights as the federal government resumed shipping the single-dose Johnson & Johnson vaccine, which was paused due to concerns over rare blood clots. But demand appears to be decreasing, concerning health experts who say the downturn could inhibit the Golden State from reaching herd immunity. First-dose appointments have fallen fifty per cent in Los Angeles County, which has also seen eighteen per cent of residents miss their second-dose appointments for the Pfizer and Moderna vaccines. In Solano County, fifteen per cent of people have skipped their second-dose appointments, and 17,000 people are overdue for their second shot in San Mateo County.