We have three safe, effective COVID-19 vaccines available in the U.S., but scientists are perfectionists and always strive to improve. So what will the next generation of COVID-19 vaccines look like? Ideally, NPR Health News reports, a perfect vaccine would include some new characteristics such as being stable at room temperature, only requiring one shot and even being something patients can self-administer. Head over to NPR to learn more about what these vaccines might look like in the future.