contagious
A contagious person has a disease that they can pass to other people: Keep him out of school until he's not contagious anymore.
stretch
an act of stretching one's limbs or body. "I got up and had a stretch"
symptom
a physical or mental feature which is regarded as indicating a condition of disease, particularly such a feature that is apparent to the patient. "dental proble
vaccination
treatment with a vaccine to produce immunity to a particular infectious disease or pathogen. "vaccination against yellow fever is essential"
a stomach bug
a sickness in which a viral infection causes inflammation in the stomach and intestines.
pass it on
to give someone something that another person has given you: Could you pass it on to Laura when you've finished reading it?
life expectancy
the number of years a person can expect to live.
extracted
remove or take out, especially by effort or force. "the fossils are extracted from the chalk"
a strain injury
A strain is when a muscle or tendon (tissue that attaches muscle to bone) is stretched too far.
prevalent
widespread in a particular area or at a particular time. "the social ills prevalent in society today"
