Two vaccines have been approved in India and China, which are administered through the nose and mouth. They could not only alleviate the course of the disease, but also prevent the transmission of Sars-CoV-2.
Vaccines against Sars-CoV-2, which are injected into the muscle, can protect people quite well from serious illnesses and hospital stays for a long time. But they do not necessarily protect against mild courses, which can still be problematic: people have to stay at home sick, may feel extremely tired and not very resilient for weeks. Long-term consequences such as chronic fatigue syndrome (ME/CFS) can also occur.