The average daily rate of vaccination has been on the decline for about two weeks. More than 20 states are not ordering all available doses of the vaccine as interest slows. Just last week, Philadelphia nearly lost 1,000 doses that were set to expire. So far, just 40% of the adult population in the United States is vaccinated, and 70% of the senior population has had their shots, CDC data shows. In order to achieve herd immunity, officials say 70% to 80% of the population must be vaccinated. Here's what you could get for free with your COVID-19 vaccination card: New Jersey announced it is offering a "shot and a beer" for residents who get their first dose in May, as part of its public awareness campaign dubbed "Operation: Jersey Summer."