Across
- 2. where the coronavirus was first identified
- 5. a treatment that stimulates the immune system to fight off a disease
- 6. this cell can turn into any human cell in the body
- 7. increased drastically during the 20th century
Down
- 1. researched the poorly-understood polio virus
- 3. the world’s first antibiotic
- 4. the first medical imaging machines were