by Deb Balzer, Mayo Clinic Electron micrograph of negatively stained Parvovirus B19 in blood. Each virus particle is about 25 to 30nM in diameter. Credit: GrahamColm/CC BY 3.0Parvovirus B19 is the cause of fifth disease, a mild rash typically seen in children, although adults can contract the virus. Parvovirus B19 affects only humans. You can’t contract...
