1.   Fleas also spread disease, both to pets and people.

2.   In cat scratch fever, however, it appears that fleas spread the infection from cat to cat, but not from person to person.

3.   It moved quickly to other Mediterranean ports and the rest of Europe, spread by fleas from the black rat and people with pneumonic plague.

4.   The bubonic form of plague, which leads to the swelling of lymph nodes, is spread by fleas.

5.   Plague is usually spread by fleas carried by infected rodents.

6.   The disease is spread by fleas from infected rats or coughs by infected people.