Person-to-person transmission of Legionella has not been demonstrated.

Person-to-person transmission of the disease is highly unlikely, scientists said, for the concentration of the virus even in very ill people is too low to be infectious.

Person-to-person transmission by either the oral-oral or fecal-oral route is most likely.

Person-to-person transmission of the known hantaviruses has not been documented.

Person-to-person transmission is associated with direct contact with the blood or other excretions, containing virus particles, of infected individuals.

Person-to-person transmission is exceedingly unusual; and patients with melioidosis should not be considered contagious.

Person-to-person transmission is uncommon and occurs through direct unprotected contact with blood and other body fluids of an infected person.

Person-to-person transmission is not believed to be common.

Person-to-person transmission is common in child care centers; infants with cryptosporidiosis-associated diarrhea can infect adults during diapering (470).