At the beginning of the year demand for COVID-19 vaccines greatly outweighed supply, now in Michigan more than 260,000 doses of the Johnson & Johnson vaccine are set to expire in the next four weeks. "The fact that we have so much vaccine available but the rate at which people are getting newly vaccinated or completing their vaccine schedule is so slow is really disappointing,” said Debra Furr-Holden, associate dean for public health integration at Michigan State University.