Coronavirus

4. change or cause to change in form or nature; undergo or cause to undergo change in a gene or genes.
6. the identification of the nature of an illness or other problem by examination of the symptoms.
9. a substance used to stimulate immunity to a particular infectious disease or pathogen
11. having official permission or approval.
12. existing or taking place within, or administered into, a vein or veins.
13. a detailed inspection or investigation.
15. a widespread occurrence of an infectious disease over a whole country or the world at a particular time.
16. a physical or mental feature which is regarded as indicating a condition of disease
19. having the right to do or obtain something; satisfying the appropriate conditions.
20. a condition in which feces are discharged from the bowels frequently and in a liquid form.

1. medical care given to a patient for an illness or injury.
2. to give help or assistance; to hold something or someone up.
3. causing death.
5. a measure taken in advance to prevent something dangerous from happening.
7. a feeling of sickness with an inclination to vomit.
8. likely to be transmitted to people, organisms, etc., through the environment.
10. the sudden or violent start of something unwelcome.
14. conditions or practices conducive to maintaining health and preventing disease, especially through cleanliness.
17. the systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions.
18. an abnormally high body temperature, usually accompanied by shivering, headache, and in severe instances, delirium.