The study of filterable pathogens is an important part of virology.

She was diagnosed with polycystic ovary syndrome.

There must be a reason why he is acting suspiciously. It's like the saying, 'Where there's smoke, there's fire.'

In chemistry class, I learned about the reaction of pyruvate.

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He is suffering from acquired immune deficiency syndrome (AIDS).

She was diagnosed with polycystic ovary syndrome.

He was diagnosed with amyotrophic lateral sclerosis.

He contracted severe invasive streptococcal disease and underwent emergency surgery.