Medics first discovered noroviruses in 1972 using an electron microscope ... to be put under quarantine in Wiesbaden after 67 tourists fell ill, or roughly every second guest. A norovirus outbreak ...

because “you can shed billions of norovirus particles that you can’t see without a microscope,” the CDC says. “It only takes a few norovirus particles to make you and other people sick.” ...

When a person is sick, they can shed billions of norovirus particles that can't be seen without a microscope. Maintaining proper hygiene, washing fruits and vegetables, cooking food thoroughly and ...

This electron microscope image provided by the Centers for Disease Control and Prevention shows a cluster of norovirus virions. (Charles D. Humphrey/CDC via AP, File) Since Jan. 10, the American ...