My younger brother is a sick child, always under the care of a doctor.

Taking care of a sick child is tough.

Ebola virus disease is highly infectious and can cause severe symptoms.

I have a severe headache due to meteoropathy.

I get motion sickness as soon as I get on a boat.

He got infected with brucellosis because he was handling cows that were infected with the disease.

He used malingering to skip school.

It is said that venereal disease was widespread during the Edo period.

This epidemic is spreading all over the world.

This epidemic spread rapidly around the world.