Morbidity (noun)

1. The state of being diseased.
2. The occurrence of a particular disease in a population.

Origin:

From latin morbus, disease.

Examples:

1. The high morbidity rate of the disease was a concern for public health.
2. The morbidity of the population increased due to poor environmental conditions.
3. The morbidity of the city was affecting the health of the citizens.
4. The study showed the correlation between poverty and morbidity.
5. The rise in morbidity was due to the spread of infectious diseases.