To contain the SARS-CoV2 coronavirus and slow the spread of infections and the rising death toll, researchers and health professionals around the world are rapidly developing vaccines and medical drugs. But before these can be tested in human clinical trials, they must first be thoroughly tested in animals. Mice are particularly well suited as model organisms because they are small and reproduce quickly. There are also well-researched inbreeding strains, from which all animals are genetically identical and can thus be easily compared.