Incorrect. Diseases have symptoms, but there can be infections with no symptoms, that is, asymptomatic infections. Anyone who has never heard the term "asymptomatic infection" must have slept through the past three years. I was infected with the SARS-CoV-2 virus twice to my knowledge. The first time I had COVID-19. The second time I did not. However, not being as asshole, I conducted myself as if I did.