Because the canyon's environments are so different, these species did not spread beyond the canyon, or even far within it.

VOA: special.2009.10.07

The World Health Organization this week declared the first pandemic, or worldwide spread, of influenza in forty-one years.

VOA: special.2009.06.13

They spread through the air when the person coughs or sneezes or even sings and talks.

VOA: special.2009.03.25

Infection can spread through touching an infected surface and then touching your eyes, nose or mouth.

VOA: special.2009.07.14

They depend on birds,bees or insects to spread their pollen to another orchid flower.

VOA: special.2010.04.06

Most efforts to curb their spread have failed, and many people resort to killing the toads with poison gases or by freezing them.

VOA: standard.2010.02.07

"For the health sector, it will be to be ready to cope with a disease, which will spread in areas where they do not spread or which may become more serious,".

VOA: standard.2009.08.30

"It just is not a good idea." Swine flu parties are the latest version of chickenpox parties, where parents encourage their kids to share lollipops, spoons or whistles to spread the disease and get immunity.

VOA: standard.2009.12.18