The infected person is often unaware of the disease and unknowingly passes it on to their sexual partner.

She also practised breastfeeding, perhaps unknowingly passing the virus to the baby girl that way.

Even a "friend" can unknowingly pass on multimedia that's actually malicious software.

It seems that many men, however, show little in the way of symptoms and may therefore pass on the disease quite unknowingly.

Because of misperceptions, many women unknowingly pass the virus to their children.

That means, of course, that released inmates will unknowingly pass on diseases to others.

The actress played a woman who unknowingly passes smallpox on to just about all of New York.

Last month my wife and I, along with a dog, unknowingly passed close to the hunters, having entered the park from my father's property.

The brokers selling the investments unknowingly passed that false information on to buyers.

They will also have spent years unknowingly passing on the infection.