bug
Since catching a stomach bug two weeks ago, he hasn't been able to eat any solids.
The main causes of absence from work were minor ailments such as colds, flu, and stomach bugs.
The holidaymakers are demanding compensation after they were struck down by a virulent stomach bug at the resort.
She thought she just had a tummy bug but it turned out she was pregnant.

SMART Vocabulary: related words and phrases

Bacteria, moulds, germs & viruses
abacterial
acquired immune deficiency syndrome
acquired immunodeficiency syndrome
adenovirus
aerobe
amoeba
bacteriology
flora
fly agaric
germicidal
germophobe
gnotobiotic
listeria
microbe
probiotic
prokaryotic
reindeer moss
respiratory syncytial virus
retroviral
root rot

You can also find related words, phrases, and synonyms in the topics:

Vomiting & feelings of sickness