Diphtheria is a contagious illness caused by a type of bacteria.

Hand, foot and mouth is a highly contagious viral illness but it doesn't cause much harm.

It can be like putting a patient with a contagious illness into a roomful of healthy people.

Avoid contact with people who have the flu or other contagious illness.

Avoid being near people who have colds, the flu, or other contagious illnesses.

However, most of the time we find out it's usually too late to guard against colds, flu, and other contagious illnesses.

They are abused, assaulted and have the threat of contagious illnesses to deal with in daily work.

Usually the course of a contagious illness could be easily plotted sequentially through a family or a community.

Measles is a very contagious (easily spread) illness caused by a virus.

I'm afraid that the driver's wife may have some contagious illness.