Dogs can smell COVID infections in patients, with as much accuracy as a PCR test. What's stopping us from building a machine that 'smells' the patients and detects it as well, if not better, than a dog?

It is important to note that while dogs have been shown to have some ability to detect COVID - 1 9 in fections , they are not as accurate as P CR tests . Additionally , building a machine that can detect COVID - 1 9 in fections through smell would require a significant amount of research and development , and it is not clear if such a machine would be as effective as a P CR test . It is also important to consider the ethical implications of using animals or machines to detect COVID - 1 9 in fections , and to ensure that any such technology is developed and used in a responsible and ethical manner . </s>